SLVSBC9C March   2012  – February 2016 TPS65177 , TPS65177A

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 I2C Interface Timing Characteristics
    7. 6.7 I2C Timing Diagram
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Power-Up
        1. 7.3.1.1 TPS65177
        2. 7.3.1.2 TPS65177A
      2. 7.3.2 Power-Down
      3. 7.3.3 Thermal Shutdown
      4. 7.3.4 Undervoltage Lockout
      5. 7.3.5 Short-Circuit and Overload Protection
        1. 7.3.5.1 Boost Converter (V(AVDD)):
        2. 7.3.5.2 Buck 1 Converter (V(IO)):
        3. 7.3.5.3 Buck 2 Converter (V(CORE)):
        4. 7.3.5.4 Buck 3 Converter (V(HAVDD)):
        5. 7.3.5.5 Positive Charge-Pump Controller (V(GH)):
        6. 7.3.5.6 Negative Charge-Pump Controller (V(GL)):
    4. 7.4 Device Functional Modes
      1. 7.4.1 Boost Converter (V(AVDD))
        1. 7.4.1.1 Soft-Start
        2. 7.4.1.2 Compensation
        3. 7.4.1.3 Setting the Output Voltage V(AVDD)
        4. 7.4.1.4 High Voltage Stress Mode (HVS)
        5. 7.4.1.5 Programmable Current Limit
        6. 7.4.1.6 Design Procedure
        7. 7.4.1.7 Inductor Selection
        8. 7.4.1.8 Rectifier Diode Selection
          1. 7.4.1.8.1 Diode Type
          2. 7.4.1.8.2 Forward Voltage
          3. 7.4.1.8.3 Reverse Voltage
          4. 7.4.1.8.4 Thermal Characteristics
        9. 7.4.1.9 Output Capacitor Selection
      2. 7.4.2 Buck 1 Converter (V(IO))
        1. 7.4.2.1 Soft-Start
        2. 7.4.2.2 Setting the Output Voltage V(IO)
        3. 7.4.2.3 Design Procedure
        4. 7.4.2.4 Inductor Selection
        5. 7.4.2.5 Rectifier Diode Selection
          1. 7.4.2.5.1 Diode Type
          2. 7.4.2.5.2 Forward Voltage
          3. 7.4.2.5.3 Reverse Voltage
          4. 7.4.2.5.4 Forward Current
          5. 7.4.2.5.5 Thermal Characteristics
        6. 7.4.2.6 Output Capacitor Selection
      3. 7.4.3 BUCK 2 CONVERTER (V(CORE))
        1. 7.4.3.1 Soft-Start
        2. 7.4.3.2 Setting the Output Voltage V(CORE)
        3. 7.4.3.3 Design Procedure
        4. 7.4.3.4 Inductor Selection
        5. 7.4.3.5 Output Capacitor Selection
      4. 7.4.4 Buck 3 Converter (V(HAVDD))
        1. 7.4.4.1 Soft-Start
        2. 7.4.4.2 Setting the Output Voltage V(HAVDD)
        3. 7.4.4.3 High Voltage Stress Mode (HVS)
        4. 7.4.4.4 Design Procedure
        5. 7.4.4.5 Inductor Selection
        6. 7.4.4.6 Output Capacitor Selection
      5. 7.4.5 Positive Charge Pump Controller (V(GH)) with Temperature Compensation
        1. 7.4.5.1 Soft-Start
        2. 7.4.5.2 Setting the Output Voltage V(GH)
        3. 7.4.5.3 Design Procedure
        4. 7.4.5.4 Output Capacitor Selection
      6. 7.4.6 Negative Charge Pump Controller (V(GL))
        1. 7.4.6.1 Soft-Start
        2. 7.4.6.2 Setting the Output Voltage V(GL)
        3. 7.4.6.3 Design Procedure
        4. 7.4.6.4 Output Capacitor Selection
    5. 7.5 Gate Pulse Modulation (V(GHM))
    6. 7.6 Programming
      1. 7.6.1  I2C Serial Interface Description
      2. 7.6.2  Memory Description
      3. 7.6.3  Read / Write Description
      4. 7.6.4  Write Operation
        1. 7.6.4.1 Write Single Byte to the DAC Register (DR):
        2. 7.6.4.2 Write Multiple Bytes to the DAC Register (DR):
        3. 7.6.4.3 Write All DAC Register (DR) Data to EEPROM (EE):
      5. 7.6.5  READ OPERATION
        1. 7.6.5.1 Read single data from DAC register (DR):
        2. 7.6.5.2 Read Multiple Data from DAC Register (DR):
        3. 7.6.5.3 Read Single Data to EEPROM (EE):
        4. 7.6.5.4 Read Multiple Data to EEPROM (EE):
      6. 7.6.6  Write Single Data to DAC:
      7. 7.6.7  Write Multiple Data to DAC (Auto Increment Address):
      8. 7.6.8  Write all DAC Data to EEPROM:
      9. 7.6.9  Read Single Data From DAC / EEPROM:
      10. 7.6.10 Read Multiple Data fFom DAC / EEPROM (Auto Increment Address):
    7. 7.7 Register Map
      1. 7.7.1 Registers and DAC Settings
        1. 7.7.1.1  Channel Register (with factory value) - 00h (00h)
        2. 7.7.1.2  Boost Output Voltage V(AVDD) Register (with factory value) - 01h (0Fh)
        3. 7.7.1.3  Boost HVS Offset Voltage Register (with factory value) - 02h (05h)
        4. 7.7.1.4  Boost Current Limit Negative Offset Current Register (with factory value) - 03h (00h)
        5. 7.7.1.5  Boost Soft-start Time Register (with factory value) - 04h (00h)
        6. 7.7.1.6  Buck 1 Output Voltage V(IO) Register (with factory value) - 05h (03h):
        7. 7.7.1.7  Buck 2 Output Voltage V(CORE) Register (with factory value) - 06h (02h)
        8. 7.7.1.8  Buck 3 Output Voltage V(HAVDD) Register (with factory value) - 07h (1Bh)
        9. 7.7.1.9  Pos. Charge Pump Low Output Voltage V(GH_L) Register (with factory value) - 08h (08h):
        10. 7.7.1.10 Positive Charge Pump Low Output Voltage V(GH_L) to V(GH_H) Positive Offset Voltage V(GH_OFS) Register (with factory value) - 09h (04h):
        11. 7.7.1.11 Gate Pulse Modulation Limit Voltage Register (with factory value) - 0Ah (00h)
        12. 7.7.1.12 Negative Charge Pump Output Voltage V(GL) Register (with factory value) - 0Bh (04h)
        13. 7.7.1.13 Buck 3 HVS Offset Voltage Register (with factory value) - 0Ch (00h):
        14. 7.7.1.14 Memory Write Remain Time Register (with factory value) - FEh (0Fh):
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 System Examples
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guideline
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Related Links
    2. 11.2 Third-Party Products Disclaimer
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7 Detailed Description

7.1 Overview

The TPS65177/A provides all supply rails needed by a GIP (Gate-in-Panel) or non-GIP TFT-LCD panel. All output voltages are I2C programmable.

V(IO) and V(CORE) for the T-CON, V(AVDD) and V(HAVDD) for the Source Driver and the Gamma Buffer, V(GH) and V(GL) for the Gate Driver or the Level Shifter. For use with non-GIP technology Gate Pulse Modulation (GPM) is implemented, for use with GIP technology the V(GH) rail can be temperature compensated. Furthermore a High Voltage Stress Mode (HVS) for V(AVDD) and V(HAVDD) and an integrated V(AVDD) Isolation Switch is implemented. V(CORE), V(HAVDD), V(GH), V(GL), GPM and the V(GH) temperature compensation can be enabled and disabled by I2C programming.

A single BOM (Bill of Materials) can cover several panel types and sizes whose desired output voltage levels can be programmed in production and stored in a non-volatile integrated memory.

7.2 Functional Block Diagram

TPS65177 TPS65177A Blockdiagram.gif

7.3 Feature Description

7.3.1 Power-Up

When VI rises above the UVLO (undervoltage lockout) the device loads the stored values in the non-volatile Initial Value register into the volatile DAC register. When all data is written the power-up sequencing starts with enabling the buck 1 converter (V(IO)), which ramps up its output voltage in 3 ms. When the output is in regulation the buck 2 converter (V(CORE)) starts and ramps up its output voltage in 3 ms, when its output voltage is in regulation the negative charge pump controller starts and V(GL) is declining in typ. 1.5 ms until the output voltage is in regulation. In case V(GL) is driven by the boost switch pin (SW) V(GL) starts declining when the boost starts switching.

When the enable pin (EN) is pulled “high” the isolation switch closes smoothly so that after typ. 10 ms its output (V(AVDD)) is at VI level, then the boost converter (V(AVDD)) starts and its output voltage (V(AVDD)) ramps linearly in 10 ms or 20 ms (programmable by I2C) until it is in regulation. Then the positive charge pump controller starts and V(GH) is rising in typ. 1.5 ms until the output voltage is in regulation. To ensure proper sequencing even if EN is pulled “high” already at the beginning (e.g. connected to VI) the start of the boost converter V(AVDD) is blocked until V(GL) is Power Good or 2.5 ms have passed since V(GL) was enabled.

If the EN pin is not connected to VI, the device detects a collapsed V(AVDD) voltage about 40 ms after EN is pulled low. This function prevents the panel to restart without a proper power supply reset. The device partially shuts down as described in the Short-Circuit and Overload Protection section. The device is in a latched state and only a power cycle can restart the V(AVDD), V(HAVDD), V(GH) and V(GL) rail.

When V(GL) is driven by the boost switch pin (SW) the EN-pin should be connected to VI, otherwise V(GL) detects a short when EN is pulled low as the V(GL) voltage collapses. V(GL) collapses because the supporting switch node (SW) stops switching and the device partially shuts down as described in the Short-Circuit and Overload Protection section. The device is in a latched state and only a power cycle can restart the V(AVDD), V(HAVDD), V(GH) and V(GL) rail.

The buck 2 and buck 3 converter as the negative and positive charge pump controller can be disabled by I2C. If disabled they are skipped in the sequencing (e.g. disabled buck 2 → buck 1 is in regulation → start neg. CP).

The Gate Pulse Modulation block is disabled when VI is below UVLO or EN is “low” and enabled when V(GH) is in regulation. When the block is disabled by UVLO the high side switch of the Gate Pulse Modulation is turned on and the output VGHM is connected to the VGH pin, when the block is disabled by pulling the EN pin “low” the low side switch is turned on and the output VGHM is connected to the RE pin.

7.3.1.1 TPS65177

If the EN pin is not connected to VI, the device detects a collapsed V(AVDD) voltage about 40 ms after EN is pulled low. This function prevents the panel to restart without a proper power supply reset. The device partially shuts down as described in the Short-Circuit and Overload Protection section. The device is in a latched state and only a power cycle can restart the V(AVDD), V(HAVDD), V(GH) and V(GL) rail.

7.3.1.2 TPS65177A

The device can be restarted without a power cycle, however note that when V(GL) is driven by the boost switch pin (SW) the EN-pin should be connected to VI. If the EN-pin is not connected to VI the V(GL) protection detects a short when EN is pulled low as the V(GL) voltage collapses. V(GL) collapses because the supporting switch node (SW) stops switching and the device partially shuts down as described in the Short-Circuit and Overload Protection section. The device is in a latched state and only a power cycle can restart the V(AVDD), V(HAVDD), V(GH) and V(GL) rail.

TPS65177 TPS65177A TPS65177_sequencing.gif Figure 10. TPS65177 Power-up Sequencing
TPS65177 TPS65177A TPS65177A_sequencing.gif Figure 11. TPS65177A Power-up Sequencing

7.3.2 Power-Down

When VI falls below the UVLO threshold all blocks are disabled and the discharge rate is given by the output load and the output capacitors. The Gate Pulse Modulation output V(GHM) follows V(GH).

7.3.3 Thermal Shutdown

A thermal shutdown is implemented to prevent damage because of excessive heat and power dissipation. Once a temperature of typically 150 ºC is exceeded the device shuts down and stays off. VI must fall below Undervoltage lockout threshold (UVLO) to reset the thermal shutdown.

7.3.4 Undervoltage Lockout

To avoid mis-operation of the device at low input voltages an undervoltage lockout is included, which shuts down the device at voltages lower than typically 8.3 V.

7.3.5 Short-Circuit and Overload Protection

7.3.5.1 Boost Converter (V(AVDD)):

When V(SWO) < 40% of its nominal value → Shut down Boost, Isolation Switch, Buck3, neg. and pos. Charge Pump controller (Buck 1 and Buck 2 keep working) → latched condition, only triggering UVLO enables the device again.
When V(SWO) < 80% of its nominal value for longer than 50 ms (overload) → Shut down Boost, Isolation Switch, Buck3, neg. and pos. Charge Pump controller (Buck 1 and Buck 2 keep working) → latched condition, only triggering UVLO enables the device again.

7.3.5.2 Buck 1 Converter (V(IO)):

When V(IO) < 40% of its nominal value → Shut down the whole device → latched condition, only triggering UVLO enables the device again.
When V(IO) < 80% of its nominal value for longer than 50 ms (overload) → Shut down the whole device → latched condition, only triggering UVLO enables the device again.

7.3.5.3 Buck 2 Converter (V(CORE)):

When V(CORE) < 40% of its nominal value → Shut down the whole device → latched condition, only triggering UVLO enables the device again.
When V(CORE) < 80% of its nominal value for longer than 50 ms (overload) → Shut down the whole device → latched condition, only triggering UVLO enables the device again.

7.3.5.4 Buck 3 Converter (V(HAVDD)):

When V(HAVDD) < 40% of its nominal value → Shut down Buck3, Isolation Switch, Boost, neg. and pos. Charge Pump controller (Buck 1 and Buck 2 keep working) → latched condition, only triggering UVLO enables the device again.
When V(HAVDD) < 80% of its nominal value for longer than 50 ms (overload) → Shut down Buck3, Isolation Switch, Boost, neg. and pos. Charge Pump controller (Buck 1 and Buck 2 keep working) → latched condition, only triggering UVLO enables the device again.

7.3.5.5 Positive Charge-Pump Controller (V(GH)):

When V(GH) < 40% of its nominal value → Shut down pos. Charge Pump, Isolation Switch, Boost, Buck3, neg. Charge Pump controller (Buck1 and Buck2 keep working) → latched condition, only triggering UVLO enables the device again.
When V(GH) < 80% of its nominal value for longer than 50 ms (overload) → Shut down pos. Charge Pump, Isolation Switch, Boost, Buck3, neg. Charge Pump controller (Buck1 and Buck2 keep working) → latched condition, only triggering UVLO enables the device again.

7.3.5.6 Negative Charge-Pump Controller (V(GL)):

When V(GL) < 40% of its nominal value → Shut down neg. Charge Pump, Isolation Switch, Boost, Buck3, pos. Charge Pump controller (Buck1 and Buck2 keep working) → latched condition, only triggering UVLO enables the device again.
When V(GL) < 80% of its nominal value for longer than 50 ms (overload) → Shut down neg. Charge Pump, Isolation Switch, Boost, Buck3, pos. Charge Pump controller (Buck1 and Buck2 keep working) → latched condition, only triggering UVLO enables the device again.
TPS65177 TPS65177A prog_volt_lvsbb1.gif Figure 12. Short-Circuit Levels Overview

7.4 Device Functional Modes

7.4.1 Boost Converter (V(AVDD))

The quasi-synchronous current mode boost converter operates with Pulse Width Modulation (PWM) with a fixed frequency of 750 kHz. For maximum design flexibility and stability with different external components, the converter uses external loop compensation by a simple RC circuit. The converter has an input-to-output switch at the output rail to disconnect its output.

7.4.1.1 Soft-Start

The boost converter is enabled by the EN-pin, the startup is done in two steps:

  1. Input-to-output isolation switch soft-start
    The isolation switch is turned on slowly in 10 ms
  2. Boost converter soft-start
    When the isolation switch is fully turned on (after 10 ms) the boost converter starts switching and ramps up its output voltage V(AVDD) from VI to the programmed voltage value in 10 or 20 ms (programmable by I2C).

7.4.1.2 Compensation

The regulator loop can be compensated by adjusting the external RC circuit connected to the COMP pin. The COMP-pin is the output of the transconductance error amplifier. The compensation capacitor adjusts the low frequency gain and the resistor the high frequency gain. Lower output voltages require a higher gain and therefore a smaller compensation capacitor. A good start working for most applications is C(COMP) = 470 pF and R(COMP) = 75 kΩ. In case of a high noise level an additional 22-pF capacitor can be put between the COMP-pin and GND to filter the high frequency noise. The cut-off frequency can be calculated as follows:

Equation 1. TPS65177 TPS65177A EQ1_fz_lvsbb1.gif

7.4.1.3 Setting the Output Voltage V(AVDD)

The output voltage is programmable by I2C between 13.5 V and 19.8 V in 100 mV steps.

7.4.1.4 High Voltage Stress Mode (HVS)

By pulling the HVS-pin “high” an I2C programmable offset voltage is added to the set boost and buck 3 converters output voltage V(AVDD) and V(HAVDD). The offset voltages are programmable independently.

7.4.1.5 Programmable Current Limit

The current limit of typ. 5 A can be reduced by I2C programming in 400 mA steps down to 2.2 A to support smaller inductors with lower saturation current.

7.4.1.6 Design Procedure

The first step in the design procedure is to verify whether the maximum possible output current of the boost converter supports the specific application requirements.

  1. Converter Duty Cycle: TPS65177 TPS65177A IL1_D_lvsbb1.gif
  2. Inductor ripple current: TPS65177 TPS65177A IL2_DIL_lvsbb1.gif
  3. Maximum output current: TPS65177 TPS65177A IL3_Iout_lvsbb1.gif
  4. Peak switch current: TPS65177 TPS65177A IL4_Iswpeak_lvsbb1.gif

    5. SPACER

    η = Estimated boost converter efficiency (use the number from the efficiency plots or 0.9 as an estimation)
    ƒs = Switching frequency (typ. 750 kHz)
    L = Selected inductor value (typ. 6.8 µH)
    ILIM_min: Minimum current limit
    ISWPEAK = Peak switch current for the used output current (must be < ILIM_min = 4.25 A)
    ΔIL = Inductor peak-to-peak ripple current

The peak switch current ISWPEAK is the current that the integrated switch, the inductor and the external Schottky diode have to be able to handle. The calculation must be done for the minimum input voltage where the peak switch current is the highest.

7.4.1.7 Inductor Selection

Inductor value: 4.7 µH ≤ L ≤ 10 µH The higher the inductor value the lower the inductor current ripple and the output voltage ripple but the slower the transient response.
Saturation current: ISAT ≥ ISWPEAK
or
ISAT ≥ ILIM_max		 The inductor saturation current must be higher than the switch peak current for the max. peak output current or as a more conservative approach higher than the max. switch current limit.
DC resistance: The lower the inductors resistance the lower the losses and the higher the efficiency.
INDUCTANCE SUPPLIER(1) COMPONENT CODE SIZE (L x W x H mm) DCR Typ. (mΩ) ISAT (A)
6.8 µH Sumida CDRH105R 10.5 x 10.3 x 5.1 14 5.4
6.8 µH Sumida CDRH10D43R 10.8 x 10.5 x 4.5 20 7
10 µH Sumida CDRH10D43R 10.8 x 10.5 x 4.5 26 5.2
6.8 µH Chilisin SCDS105R 10.5 x 10.3 x 5.1 14 5.4
6.8 µH Chilisin SCDS104R 10.5 x 10.3 x 4 21 5
10 µH Chilisin SCDS105R 10.5 x 10.3 x 5.1 22 4.45
(1) See Third-Party Products disclaimer

7.4.1.8 Rectifier Diode Selection

7.4.1.8.1 Diode Type

Schottky or Super Barrier Rectifier (SBR) for better efficiency

7.4.1.8.2 Forward Voltage

The lower the forward voltage VF the higher the efficiency and the lower the diode temperature.

7.4.1.8.3 Reverse Voltage

VR must be higher than the output voltage and should be higher than the OVP voltage 22.5 V

7.4.1.8.4 Thermal Characteristics

The diode must be able to handle the dissipated power of:

Equation 2. PD = VF x IOUT

Table 1. Diodes

VR / IAVG VF Typ. at 25°C COMPONENT CODE RθJL SIZE SUPPLIER(1)
30 V / 3 A 0.39 V at 3 A SBR3U30P1 5 °C/W PowerDI® 123 Diodes
30 V / 3 A 0.39 V at 3 A SSM33LSPT 18 °C/W SMA-S Chenmko
40 V / 3 A 0.38 V at 3 A SSM34LAS 18 °C/W SMA-S Chenmko
40 V / 2 A 0.5 V at 2 A SSM24APT 20 °C/W SMA-S Chenmko
(1) See Third-Party Products disclaimer

7.4.1.9 Output Capacitor Selection

For best output voltage filtering, low ESR ceramic capacitors are recommended. Four 10 µF (or two 22 µF) ceramic capacitors work for most applications. To improve the load transient response more capacitance can be added. Between the rectifier diode and the SWI-pin one 10 µF capacitor is required.

To calculate the output voltage ripple the following equations can be used:

Equation 3. TPS65177 TPS65177A EQ2_Dvc_lvsbb1.gif
CAPACITOR VOLTAGE RATING TEMPERATURE CHARACTERISTICS SUPPLIER(1) COMPONENT CODE
10 µF / 1206 25 V X5R Murata GRM31CR61E106KA12
10 µF / 1206 25 V X7R Taiyo Yuden TMK316AB7106KL
(1) See Third-Party Products disclaimer.

7.4.2 Buck 1 Converter (V(IO))

The non-synchronous current mode buck 1 converter operates with Pulse Width Modulation (PWM) with a fixed frequency of 750 kHz. The converter features integrated soft-start, bootstrap and compensation to minimize external component and pin count.

The buck 1 converter operates in Discontinuous Conduction Mode (DCM) or Continuous Conduction Mode (CCM) depending on the load current. For low load currents the converter operates in DCM. In this mode the inductor current reaches 0 A when the switch is turned off. With increasing load current the inductor current finally does not reach 0 A anymore but is always positive and then the converter operates in CCM. The switch node waveforms for DCM and CCM operation are shown in Figure 23 and Figure 24. The ringing during DCM (at light load) is normal for this operating mode, it occurs because of parasitic capacitance in the PCB layout. Because there is very little energy contained in the ringing waveform it does not significantly affect EMI performance.

Minimum output current for DCM: MTPS65177 TPS65177A ILmin_ID_lvsbb1.gif

For low load currents when the minimum on time is not sufficient, the buck 1 converter uses a skip mode to be able to regulate its output voltage V(IO). During the skip mode the converter switches for a few cycles to raise the output voltage then it stops switching until the output voltage falls below a given threshold and the converter starts switching again. Due to this behavior the output voltage ripple can be slightly higher during skip mode.

7.4.2.1 Soft-Start

The buck 1 converter is enabled with the undervoltage lockout (UVLO). It starts switching and ramps up its output voltage V(IO) linearly in 3 ms to the programmed voltage value.

7.4.2.2 Setting the Output Voltage V(IO)

The output voltage is programmable by I2C between 2.2 V and 3.7 V in 100 mV steps.

7.4.2.3 Design Procedure

The first step in the design procedure is to verify whether the maximum possible output current of the buck 1 converter supports the specific application requirements. Because the buck 2 converter is supplied by the buck 1 converter and the negative charge pump is driven from the buck 1 converter’s switch node the effective output current I(IO) is higher than the buck 1 output current alone.

  1. Converter Duty Cycle: TPS65177 TPS65177A IL5_D_lvsbb1.gif
  2. Inductor ripple current: TPS65177 TPS65177A IL6_Dil_lvsbb1.gif
  3. Maximum output current: TPS65177 TPS65177A IL7_Iout_lvsbb1.gif
  4. Peak switch current: TPS65177 TPS65177A IL8_Iswpeak_lvsbb1.gif
  5. Effective output current: TPS65177 TPS65177A IL9_Ibuck_lvsbb1.gif

    6. spacer

    η = Estimated boost converter efficiency (use the number from the efficiency plots or 0.8 as an estimation)
    ƒs = Switching frequency (typ. 750 kHz)
    L = Selected inductor value (typ. 6.8 µH)
    ILIM_min: Minimum current limit (3 A)
    ISWPEAK = Peak switch current for the used output current (must be < ILIM_min = 3 A)
    ΔIL = Inductor peak-to-peak ripple current

The peak switch current ISWPEAK is the current that the integrated switch, the inductor and the external Schottky diode have to be able to handle. The calculation must be done for the maximum input voltage where the peak switch current is the highest.

7.4.2.4 Inductor Selection

Inductor value: 4.7 µH ≤ L ≤ 10 µH The higher the inductor value the lower the inductor current ripple and the output voltage ripple but the slower the transient response.
Saturation current: ISAT ≥ ISWPEAK
or
ISAT ≥ ILIM_max		 The inductor saturation current must be higher than the switch peak current for the max. peak output current or as a more conservative approach higher than the max. switch current limit.
DC resistance: The lower the inductors resistance the lower the losses and the higher the efficiency.
INDUCTANCE SUPPLIER(1) COMPONENT CODE SIZE (L x W x H mm) DCR Typ. (mΩ) ISAT (A)
6.8 µH Sumida CDRH8D43 8.3 x 8.3 x 4.5 20 4.4
10 µH Sumida CDRH8D43 8.3 x 8.3 x 4.5 29 4
6.8 µH Chilisin SCPS0740T 7.5 x 7.8 x 4 28 3.9
(1) See Third-Party Products disclaimer

7.4.2.5 Rectifier Diode Selection

7.4.2.5.1 Diode Type

Schottky or Super Barrier Rectifier (SBR) for better efficiency

7.4.2.5.2 Forward Voltage

The lower the forward voltage VF the higher the efficiency and the lower the diode temperature.

7.4.2.5.3 Reverse Voltage

VR must be higher than the output voltage

7.4.2.5.4 Forward Current

The average rectified forward current IAVG must be higher than IOUT × (1 – D)

7.4.2.5.5 Thermal Characteristics

The diode must be able to handle the dissipated power of:

Equation 4. PD = VF x IOUT × (1 – D)

Table 2. Diodes

VR / IAVG VF typ. at 25°C COMPONENT CODE RθJL SIZE SUPPLIER(1)
30 V / 3 A 0.39 V at 3 A SBR3U30P1 5 °C/W PowerDI® 123 Diodes
30 V / 3 A 0.39 V at 3 A SSM33LSPT 18 °C/W SMA-S Chenmko
40 V / 3 A 0.38 V at 3 A SSM34LAS 18 °C/W SMA-S Chenmko
40 V / 2 A 0.5 V at 2 A SSM24APT 20 °C/W SMA-S Chenmko
(1) See Third-Party Products disclaimer

7.4.2.6 Output Capacitor Selection

For best output voltage filtering low ESR ceramic capacitors are recommended. Three 10 µF (or two 22 µF) ceramic capacitors work for most applications. To improve the load transient response more capacitance can be added.

To calculate the output voltage ripple the following equations can be used:

Equation 5. TPS65177 TPS65177A EQ3_Dvc_lvsbb1.gif
CAPACITOR VOLTAGE RATING TEMPERATURE CHARACTERISTICS SUPPLIER(1) COMPONENT CODE
10 µF / 1206 6.3 V X5R Murata GRM219R60J106KE19
10 µF / 1206 6.3 V X7R Taiyo Yuden JMK212AB7106KG
(1) See Third-Party Products disclaimer

7.4.3 BUCK 2 CONVERTER (V(CORE))

The synchronous current mode buck 2 converter operates with Pulse Frequency Modulation (PFM) with a fixed off-time and a typ. frequency of 1 MHz. The converter features integrated soft-start, bootstrap and compensation to minimize external component and pin count. It is supplied by the buck 1 converter’s output.

If not needed the buck 2 converter can be disabled by I2C.

7.4.3.1 Soft-Start

The buck 2 converter is enabled when the buck 1 converter is in regulation. It starts switching and ramps up its output voltage V(CORE) linearly in 3ms to the programmed voltage value.

7.4.3.2 Setting the Output Voltage V(CORE)

The output voltage is programmable by I2C between 0.8 V and 3.3 V in 100 mV steps.

7.4.3.3 Design Procedure

The first step in the design procedure is to verify whether the maximum possible output current of the buck 2 converter supports the specific application requirements.

  1. Switching frequency: MTPS65177 TPS65177A IL10_fs_lvsbb1.gif
  2. Converter Duty Cycle: MTPS65177 TPS65177A IL11_D_lvsbb1.gif
  3. Inductor ripple current: MTPS65177 TPS65177A IL12_Dil_lvsbb1.gif
  4. Maximum output current: MTPS65177 TPS65177A IL13_Iout_lvsbb1.gif
  5. Peak switch current: MTPS65177 TPS65177A IL14_Iswpeak_lvsbb1.gif

    6. spacer

    η = Estimated boost converter efficiency (use the number from the efficiency plots or 0.8 as an estimation)
    L = Selected inductor value (typ. 6.8 µH)
    ILIM_min: Minimum current limit (2.5A)
    ISWPEAK = Peak switch current for the used output current (must be < ILIM_min = 2.5 A)
    ΔIL = Inductor peak-to-peak ripple current

The peak switch current ISWPEAK is the current that the switch and the inductor have to be able to handle.

7.4.3.4 Inductor Selection

Inductor value: 4.7µH ≤ L ≤ 10µH The higher the inductor value the lower the inductor current ripple and the output voltage ripple but the slower the transient response.
Saturation current: ISAT ≥ ISWPEAK
or
ISAT ≥ ILIM_max		 The inductor saturation current must be higher than the switch peak current for the max. peak output current or as a more conservative approach higher than the max. switch current limit.
DC resistance: The lower the inductors resistance the lower the losses and the higher the efficiency.
INDUCTANCE SUPPLIER(1) COMPONENT CODE SIZE (L x W x H mm) DCR typ. (mΩ) ISAT (A)
4.7 µH Sumida CDRH5D28R/HP 6.2 x 6.2 x 3 35 3.7
6.8 µH Sumida CDRH5D28R/HP 6.2 x 6.2 x 3 49 3.1
4.7 µH Chilisin SCPS0725T 7.8 x 7.7 x 2.5 40 4
6.8 µH Chilisin SCPS0725T 7.8 x 7.7 x 2.5 66 3.5
4.7 µH Chilisin LVS606028 6.2 x 6.2 x 2.2 38 3.7
6.8 µH Chilisin LVS606028 6.2 x 6.2 x 2.2 50 3.1
4.7 µH Mag Layers MSCDRI-7025AL 8 x 8 x 2.5 45 3.5
6.8 µH Mag Layers MSCDRI-7025AL 8 x 8 x 2.5 63 3.1
(1) See Third-Party Products disclaimer

7.4.3.5 Output Capacitor Selection

For best output voltage filtering low ESR ceramic capacitors are recommended. Three 10 µF (or one 22 µF) ceramic capacitors work for most applications. To improve the load transient response more capacitance can be added.

To calculate the output voltage ripple the following equations can be used:

Equation 6. TPS65177 TPS65177A EQ4_Dvc_lvsbb1.gif
CAPACITOR VOLTAGE RATING TEMPERATURE CHARACTERISTICS SUPPLIER(1) COMPONENT CODE
10 µF / 1206 6.3 V X5R Murata GRM219R60J106KE19
10 µF / 1206 6.3 V X7R Taiyo Yuden JMK212AB7106KG
(1) See Third-Party Products disclaimer

7.4.4 Buck 3 Converter (V(HAVDD))

The synchronous current mode buck 3 converter operates with Pulse Frequency Modulation (PFM) with a fixed off-time and a typ. frequency of 1 MHz. The converter features integrated soft-start, bootstrap and compensation to minimize external component and pin count.

If not needed the buck 3 converter can be disabled by I2C.

7.4.4.1 Soft-Start

The buck 3 converter is enabled together with the boost converter. It starts switching and ramps up its output voltage V(HAVDD) to the programmed voltage value tracking the boost converters output voltage V(AVDD).

7.4.4.2 Setting the Output Voltage V(HAVDD)

The output voltage is programmable by I2C between 4.8 V and 11.1 V in 100 mV steps.

7.4.4.3 High Voltage Stress Mode (HVS)

By pulling the HVS-pin “high” an I2C programmable offset voltage is added to the set boost and buck 3 converters output voltage V(AVDD) and V(HAVDD). The offset voltages are programmable independently.

7.4.4.4 Design Procedure

The first step in the design procedure is to verify whether the maximum possible output current of the buck 3 converter supports the specific application requirements.

  1. Switching frequency: MTPS65177 TPS65177A IL15_fs_lvsbb1.gif
  2. Converter Duty Cycle: M TPS65177 TPS65177A IL16_D_lvsbb1.gif
  3. Inductor ripple current: M TPS65177 TPS65177A IL17_Dil_lvsbb1.gif
  4. Maximum output current: MTPS65177 TPS65177A IL18_Iout_lvsbb1.gif
  5. Peak switch current: M TPS65177 TPS65177A IL19_Iswpeak_lvsbb1.gif

    6. spacer

    η = Estimated boost converter efficiency (use the number from the efficiency plots or 0.8 as an estimation)
    fS: Switching frequency (typ. 1 MHz)
    L = Selected inductor value (typ. 6.8 µH)
    ILIM_min: Minimum current limit (1.7 A)
    ISWPEAK = Peak switch current for the used output current (must be < ILIM_min = 1.7 A)
    ΔIL = Inductor peak-to-peak ripple current

The peak switch current ISWPEAK is the current that the switch and the inductor have to be able to handle.

7.4.4.5 Inductor Selection

Inductor value: 4.7 µH ≤ L ≤ 10 µH The higher the inductor value the lower the inductor current ripple and the output voltage ripple but the slower the transient response.
Saturation current: ISAT ≥ ISWPEAK
or
ISAT ≥ ILIM_max		 The inductor saturation current must be higher than the switch peak current for the max. peak output current or as a more conservative approach higher than the max. switch current limit.
DC resistance: The lower the inductors resistance the lower the losses and the higher the efficiency.
INDUCTANCE SUPPLIER(1) COMPONENT CODE SIZE (L x W x H mm) DCR typ. (mΩ) ISAT (A)
4.7 µH Chilisin SCDS6D28T 7 x 7 x 3 25 2.5
6.8 µH Chilisin SCDS6D28T 7 x 7 x 3 40 2.1
4.7 µH Chilisin SCPS0725T 7.8 x 7.7 x 2.5 40 4
6.8 µH Chilisin SCPS0725T 7.8 x 7.7 x 2.5 66 3.5
4.7 µH Chilisin LVS404018 4.2 x 4.2 x 2 90 2
6.8 µH Chilisin LVS404018 4.2 x 4.2 x 2 110 1.6
4.7 µH Mag Layers MSCDRI-7025AL 8 x 8 x 2.5 45 3.5
6.8 µH Mag Layers MSCDRI-7025AL 8 x 8 x 2.5 63 3.1
(1) See Third-Party Products disclaimer

7.4.4.6 Output Capacitor Selection

For best output voltage filtering low ESR ceramic capacitors are recommended. One 10 µF ceramic capacitor works for most applications. To improve the load transient response more capacitance can be added.

To calculate the output voltage ripple the following equations can be used:

Equation 7. TPS65177 TPS65177A EQ5_Dvc_lvsbb1.gif
CAPACITOR VOLTAGE RATING TEMPERATURE CHARACTERISTICS SUPPLIER(1) COMPONENT CODE
10 µF / 1206 16 V X5R Murata GRM31CR61C106KA88
10 µF / 1206 16 V X7R Taiyo Yuden EMK316AB7106KL
(1) See Third-Party Products disclaimer

7.4.5 Positive Charge Pump Controller (V(GH)) with Temperature Compensation

The positive charge pump is driven from the boost converter’s switch node and regulated by controlling the current through an external PNP transistor. The controller is optimized for transistors with a DC gain (hFE) between 100 and 300, a base drive current up to 5 mA is supported. A temperature compensation for its output voltage V(GH) is implemented and the levels of the output voltages are programmed by I2C.

The positive charge pump and the temperature compensation function can be disabled by I2C separately.

7.4.5.1 Soft-Start

The positive charge pump controller is enabled when the boost converter is in regulation. The output voltage V(GH) ramps up to the programmed voltage in typ. 1.5 ms.

7.4.5.2 Setting the Output Voltage V(GH)

The low voltage V(GH_LOW) at high temperature is programmed directly by I2C from 20 V to 35 V in 1 V steps, the high voltage V(GH_HIGH) at low temperature is programmed with a positive offset voltage of 1 V steps relative to V(GH_LOW). An external NTC thermistor with a resistor network (RP and RL) sets the temperatures when V(GH_LOW) (VNTC ≤ 1 V, hot) and V(GH_HIGH) (VNTC ≥ 2 V, cold) are reached. To achieve a linear curve between V(GH_LOW) and V(GH_HIGH) a suitable linearalization resistor parallel to the NTC must be used.

TPS65177 TPS65177A linear_res_lvsbb1.gif
RT0 is the resistance at an absolute temperature T0 in Kelvin (normally 25°C)
T is the temperature in Kelvin (°C + 273.15 K/°C)
B is a material constant provided by the NTC supplier		 TPS65177 TPS65177A IL20_Rntc_lvsbb1.gif
VL: Internal supply voltage VL = 5 V TPS65177 TPS65177A IL21_Rp_lvsbb1.gif
RNTC(THOT): NTC resistance hot
RNTC(TCOLD): NTC resistance cold
TPS65177 TPS65177A vo_setting1_lvsbb1.gif
TPS65177 TPS65177A vo_setting2_lvsbb1.gif
TPS65177 TPS65177A vo_setting3_lvsbb1.gif

7.4.5.3 Design Procedure

  1. Supported max. output voltage

    2. The maximum possible output voltage is calculated as follows:

    Doubler Mode: TPS65177 TPS65177A IL22_Vgh_lvsbb1.gif

    Tripler Mode: TPS65177 TPS65177A IL23_Vgh_lvsbb1.gif

    VF: Diode forward voltage
    R: Switch node resistor
    VINPUT: Transistor emitter voltage
    D: Boost duty cycle
    C: Flying capacitor value
    fS: Boost switching frequency (750kHz)
    VQ: Collector-emitter saturation voltage

  2. Diode selection

    3. Diode type: No specific type required

    Forward voltage: The lower the forward voltage VF the higher the maximum output voltage

    Reverse voltage: VR must be higher than the switching voltage applied at the flying capacitor

    Forward current: The average forward current IAVG must be higher than the output current IOUT

    Thermal characteristics: The diode must be able to handle the dissipated power of PD = VF × IOUT

    Peak currents of up to some amps through the diodes can occur during start-up for a few cycles. This condition lasts for <1ms and can be tolerated by many diodes whose repetitive peak current rating is much lower.

    VR / IAVG VF typ. at 25°C COMPONENT CODE RθJA SIZE SUPPLIER(1)
    85 V / 150 mA 1.1 V at 150 mA BAV99TPT SOT-416 Chenmko
    75 V / 300 mA 1 V at 150 mA BAV99W 625 °C/W SOT-323 Diodes
    75 V / 215 mA 1.1 V at 150 mA BAV99BDWPT 625 °C/W SOT-363 Chenmko
    75 V / 300 mA 1 V at 150 mA BAV99BRW 625 ºC/W SOT-363 Diodes
    75 V / 300 mA 1 V at 150 mA BAV99T 833 ºC/W SOT-523 Diodes
    30 V / 1 A 0.47 V at 1 A CH511H-30PT 625 ºC/W SOT-323 Chenmko
    40 V / 200 mA 0.9 V at 200 mA BAS40W-04 625 ºC/W SOT-323 Diodes
    40 V / 200 mA 0.9 V at 200 mA BAS40-04T 833 ºC/W SOT-523 Diodes
    30 V / 200 mA 0.65 V at 200 mA BAT54SW 625 ºC/W SOT-323 Diodes
    30 V / 200 mA 0.65 V at 200 mA BAT54ST 833 ºC/W SOT-523 Diodes
    75 V / 300 mA 1 V at 200 mA MMBD7000 357 ºC/W SOT-23 Diodes
    (1) See Third-Party Products disclaimer
  3. Transistor selection

    4. DC gain (hFE): At least 35 when the transistors collector current is equal to the output current, for good performance 75 to 200 is recommended

    Collector-Emitter voltage: VCEO must be at least the input voltage (Emitter voltage) + switching voltage VAVDD

    DC Collector current: Must be higher than the output current IOUT / (1 – boost duty cycle)

    Thermal characteristics: The transistor must be able to handle the dissipated power of:

    Doubler Mode: TPS65177 TPS65177A IL24_Pdis_lvsbb1.gif

    Tripler Mode: TPS65177 TPS65177A IL25_Pdis_lvsbb1.gif

    VINPUT: Input voltage
    VF: Diode forward voltage
    IGH: Mean output current
    D: Boost duty cycle
    R: Switch node resistor
    C: Flying capacitor value
    fS: Boost switching frequency (750kHz)

    The total power dissipation of the chosen package is specified with a very good thermal designed PCB. The specified max. power dissipation can only be dissipated if the cooling area at the PCB is big enough. The total area should be at least 5 cm2 it can be spread over different layers when using many vias.

    VCEO / IC hFE min…max. VCEsat COMPONENT CODE Ptot SIZE SUPPLIER(1)
    –60 V / –600 mA 100…300 at –150 mA –150 mV CHT2907XPT 1.2 W SOT-89 Chenmko
    –40 V / –200 mA 60…300 at –50 mA –200 mV CH3906XPT 1.2 W SOT-89 Chenmko
    –50 V /–2 A 70…240 at –500 mA –150 mV KTA1666 1 W SOT-89 KEC
    –60 V / –1 A 50…200 at –500 mA –300 mV KTA1668 1 W SOT-89 KEC
    –60 V / –600 mA 100…300 at –150 mA –150 mV PZT2907AT1 1.5 W SOT-223 ON Semi
    (1) See Third-Party Products disclaimer
  4. Base-Emitter resistor selection

    5. A 100-kΩ base-emitter resistor is required to ensure proper operation. It is needed to ensure that the transistor can be turned off completely. Too low resistor value reduce the maximum base drive current.

  5. Flying capacitor selection

    6. A flying capacitor of 470 nF is appropriate for most applications. Larger capacitances have a smaller voltage drop ∆V at the end of each switching cycle and support therefore higher output voltages and currents. The voltage rating must be at least the switching voltage V(AVDD).

    C: Flying capacitor value TPS65177 TPS65177A IL26_Dv_lvsbb1.gif
    fS: Boost switching frequency (750kHz)
    CAPACITOR VOLTAGE RATING TEMPERATURE CHARACTERISTICS SUPPLIER(1) COMPONENT CODE
    470 nF / 0603 25 V X7R Murata GRM188R71E474KA12
    470 nF / 0603 25 V X5R Taiyo Yuden TMK107BJ474KA
    (1) See Third-Party Products disclaimer
  6. Switch node resistor selection

    7. For less boost converter disturbance and therefore lower boost output voltage ripple ∆V(AVDD) and lower diode current spikes a resistor should be added in the switching path. The higher the resistance the lower the disturbances and the peak currents but also the lower the maximum output current and the higher the resistors power dissipation PR. A 1 Ω to 2.2 Ω resistor is appropriate for most applications.

    IGH: VGH mean output current
    D: Boost converter duty cycle
    R: Switch node resistor    		 TPS65177 TPS65177A IL37_Pr_lvsbb1.gif

7.4.5.4 Output Capacitor Selection

For best output voltage filtering low ESR ceramic capacitors are recommended. One 4.7 µF ceramic capacitor works for most applications. To improve the load transient response more capacitance can be added.

CAPACITOR VOLTAGE RATING TEMPERATURE CHARACTERISTICS SUPPLIER(1) COMPONENT CODE
4.7 µF / 1206 50 V X7R Murata GRM31CR71H475KA12
4.7 µF / 1206 50 V X5R Taiyo Yuden UMK316BJ475KL
(1) See Third-Party Products disclaimer

7.4.6 Negative Charge Pump Controller (V(GL))

The negative charge pump usually is driven from the buck 1 converter’s switch node but can also be connected to the boost converter’s switch node and regulated by controlling the current through an external NPN transistor. The controller is optimized for transistors with a DC gain (hFE) between 100 and 300, a base drive current up to 5 mA is supported.

The negative charge pump can be disabled by I2C.

TPS65177A:

When V(GL) is driven by the boost switch pin (SW) the EN-pin should be connected to VI, otherwise V(GL) detects a short when EN is pulled low as the V(GL) voltage collapses. V(GL) collapses because the supporting switch node (SW) stops switching and the device partially shuts down as described in the Short-Circuit and Overload Protection section. The device is in a latched state and only a power cycle can restart the V(AVDD), V(HAVDD), V(GH) and V(GL) rail.

7.4.6.1 Soft-Start

The negative charge pump controller is enabled when the buck 2 converter is in regulation. The output voltage V(GL) ramps up to the programmed voltage in typ. 1.5 ms.

7.4.6.2 Setting the Output Voltage V(GL)

The output voltage is programmable by I2C between –14.5 V and –5.5 V in 600 mV steps.

7.4.6.3 Design Procedure

  1. Supported max. output voltage

    2. The maximum possible negative output voltage is calculated as follows:

    Using buck 1 converter’s switch node:
    Inverter: TPS65177 TPS65177A IL28_VGL_lvsbb1.gif

    VINPUT: Transistor emitter node voltage
    VF: Diode forward voltage
    R: Switch node resistor
    D: Buck duty cycle
    C: Flying capacitor value
    fS: Boost and Buck1 switching frequency (750kHz)
    VQ: Collector-emitter saturation voltage

    Using boost converter’s switch node:
    Inverter: TPS65177 TPS65177A IL30_VGL_lvsbb1.gif

  2. Diode selection

    3. Diode type: No specific type required

    Forward voltage: The lower the forward voltage VF the higher the maximum output voltage

    Reverse voltage: VR must be higher than the switching voltage applied at the flying capacitor VIN or VAVDD

    Forward current: The average forward current IAVG must be higher than the output current IOUT

    Thermal characteristics: The diode must be able to handle the dissipated power of PD = VF × IOUT

    Peak currents of up to some amps through the diodes can occur during start-up for a few cycles. This condition lasts for < 1 ms and can be tolerated by many diodes whose repetitive peak current rating is much lower.

    VR / IAVG VF typ. at 25°C COMPONENT CODE RθJA SIZE SUPPLIER(1)
    85 V / 150 mA 1.1 V at 150 mA BAV99TPT SOT-416 Chenmko
    75 V / 300 mA 1 V at 150 mA BAV99W 625 °C/W SOT-323 Diodes
    75 V / 215 mA 1.1 V at 150 mA BAV99BDWPT 625 °C/W SOT-363 Chenmko
    75 V / 300 mA 1 V at 150 mA BAV99BRW 625 ºC/W SOT-363 Diodes
    75 V / 300 mA 1 V at 150 mA BAV99T 833 ºC/W SOT-523 Diodes
    30 V / 1 A 0.47 V at 1 A CH511H-30PT 625 ºC/W SOT-323 Chenmko
    40 V / 200 mA 0.9 V at 200 mA BAS40W-04 625 ºC/W SOT-323 Diodes
    40 V / 200 mA 0.9 V at 200 mA BAS40-04T 833 ºC/W SOT-523 Diodes
    30 V / 200 mA 0.65 V at 200 mA BAT54SW 625 ºC/W SOT-323 Diodes
    30 V / 200 mA 0.65 V at 200 mA BAT54ST 833 ºC/W SOT-523 Diodes
    75 V / 300 mA 1 V at 200 mA MMBD7000 357 ºC/W SOT-23 Diodes
    (1) See Third-Party Products disclaimer
  3. Transistor selection

    4. DC gain (hFE): At least 35 when the transistors collector current is equal to the output current, for good performance 75 to 200 is recommended

    Collector-Emitter voltage: VCEO must be at least the input voltage (Emitter voltage) + switching voltage VI or V(AVDD)

    DC Collector current: Must be higher than the output current IOUT / (1 – buck duty cycle) or IOUT / boost duty cycle

    Thermal characteristics: The transistor must be able to handle the dissipated power of:

    Using buck 1 converter’s switch node:
    Inverter: TPS65177 TPS65177A IL32_Pdis_lvsbb1.gif

    VF: Diode forward voltage
    VINPUT: Input voltage
    IGL: Mean output current
    R: Switch node resistor
    D: Buck duty cycle
    C: Flying capacitor value
    fS: Boost and Buck 1 switching frequency (750kHz)

    Using boost converter's switch node:
    Inverter: TPS65177 TPS65177A IL34_Pdis_lvsbb1.gif

    The total power dissipation of the chosen package is specified with a very good thermal designed PCB. The specified max. power dissipation can only be dissipated if the cooling area at the PCB is big enough. The total area should be at least 5 cm2 it can be spread over different layers when using many vias.

    VCEO / IC hFE min…max. VCEsat COMPONENT CODE Ptot SIZE SUPPLIER(1)
    40 V / 600 mA 100…300 at 150 mA 150 mV CHT2222XPT 1.2 W SOT-89 Chenmko
    40 V / 200 mA 60…300 at 50 mA 100 mV CH3904XPT 1.2 W SOT-89 Chenmko
    80 V / 400 mA 50…240 at 200 mA 100 mV KTC4374 1 W SOT-89 KEC
    30 V / 1.5 A 100…320at 500 mA 150 mV KTC4375 1 W SOT-89 KEC
    30 V / 800 mA 50…320 at 500 mA 150 mV KTC4376 1 W SOT-89 KEC
    40 V / 600 mA 40…300 at 500 mA 500 mV PZT2222AT1 1.5 W SOT-223 ON Semi
    40 V / 200 mA 60…300 at 50 mA 200 mV PZT3904T1G 1.5 W SOT-223 ON Semi
    (1) See Third-Party Products disclaimer
  4. Base-Emitter resistor selection

    5. A 100 kΩ base-emitter (DRVN-pin to GND) resistor is integrated to ensure proper operation there is no external resistor needed. It is needed to ensure that the transistor can be turned off completely.

  5. Flying capacitor selection

    6. A flying capacitor of 470 nF is appropriate for most applications. Larger capacitances have a smaller voltage drop ∆V at the end of each switching cycle and support therefore higher output voltages and currents. The voltage rating must be at least the switching voltage VI (using buck 1 switch) or V(AVDD) (using boost switch).

    C: Flying capacitor value
    fS: Buck 1 or Boost switching frequency (750 kHz)    		 TPS65177 TPS65177A IL36_Dv_lvsbb1.gif
    CAPACITOR VOLTAGE RATING TEMPERATURE CHARACTERISTICS SUPPLIER(1) COMPONENT CODE
    470 nF / 0603 25 V X7R Murata GRM188R71E474KA12
    470 nF / 0603 25 V X5R Taiyo Yuden TMK107BJ474KA
    (1) See Third-Party Products disclaimer
  6. Switch node resistor selection

    7. For less buck 1 or boost converter disturbance and therefore lower buck 1 or boost output voltage ripple ∆V(IO) or ∆V(AVDD) and lower diode current spikes a resistor should be added in the switching path. The higher the resistance the lower the disturbances and the peak currents but also the lower the maximum output current and the higher the resistors power dissipation. A 1 Ω to 2.2 Ω resistor is appropriate for most applications

    IGL: VGL mean output current
    D: Boost converter duty cycle
    R: Switch node resistor    		 TPS65177 TPS65177A IL38_Pr_lvsbb1.gif

7.4.6.4 Output Capacitor Selection

For best output voltage filtering low ESR ceramic capacitors are recommended. One 4.7µF ceramic capacitor works for most applications. To improve the load transient response more capacitance can be added.

CAPACITOR VOLTAGE RATING TEMPERATURE CHARACTERISTICS SUPPLIER(1) COMPONENT CODE
4.7 µF / 1206 16 V X5R Murata GRM21BR61C475KA88
4.7 µF / 1206 16 V X7R Taiyo Yuden EMK212B7475KG
(1) See Third-Party Products disclaimer

7.5 Gate Pulse Modulation (V(GHM))

The Gate Pulse Modulation is controlled by the CTRL-pin, except during start-up and shut-down. During start-up V(GHM) is kept at low state (V(GHM) = V(RE)) until Power Good of the positive charge pump V(GH) is reached, at shut-down V(GHM) follows V(GH) (V(GHM) = V(GH)).

If not needed the Gate Pulse Modulation can be disabled by I2C.

CTRL = ‘high’ → V(GHM) = V(GH)

CTRL = ‘low’ → V(GHM) = V(RE) (discharges through RE resistor)

The slope at which V(GHM) discharges is set by the external resistor connected to the RE-pin, the internal MOSFET RDS(ON) (typ. 3 Ω) and the gate line capacitance connected to the VGHM-pin. The RE resistor must be connected to GND and it must also be able to handle the power dissipation.

A Gate Pulse Modulation limit voltage can be set by I2C programming. When the limit voltage is reached the discharging of VGHM through RE is stopped and the VGHM output is high impedance until CTRL goes “high” again, see Figure 13.

TPS65177 TPS65177A gate_pulse_mod_lvsbb1.gif Figure 13. Gate Pulse Modulation

7.6 Programming

7.6.1 I2C Serial Interface Description

The TPS65177/A communicates through an industry standard 2-wire I2C interface to receive data in slave mode. The I2C serial interface was developed by Philips Semiconductor (see I2C-Bus Specification, Version 2.1, January 2000). The bus consists of a data line (SDA) and a clock line (SCL) with pull-up structures. When the bus is idle both SDA and SCL lines are pulled high. All the I2C compatible devices connect to the I2C bus through open drain I/O pins, SDA and SCL. A master device, usually a microcontroller or a digital signal processor, controls the bus. The master is among other things responsible for generating the SCL signal and the slave device address to communicate with a certain device. A slave device receives and/or transmits data on the bus under control of the master device. A START condition send by the master initiates a new data transfer to the slave devices. Transitioning SDA from high to low while SCL remains high generates a START condition. A STOP condition ends a data transfer to the selected slave device. Transitioning SDA from low to high while SCL remains high generates a STOP condition (see Figure 14).

TPS65177 TPS65177A start_stop_cond_lvsbb1.gif Figure 14. START and STOP Conditions

The TPS65177/A works as a slave and supports the standard mode (100 kbps) and fast mode (400 kbps) data transfer mode, as defined in the I2C-Bus specification. The data transfer protocol for standard and fast mode is exactly the same. The TPS65177/A supports 7-bit addressing. The device 7-bit address is defined as ‘010000X’ (see Figure 15) where the bit X can be selected depending on the address pin configuration of A0 (“high” = 1, “low” = 0). The LSB enables the write or read function (“high” = read, “low” = write).

TPS65177 TPS65177A slave_add_lvsbb1.gif Figure 15. TPS65177/A Slave Address Byte

The master generates the SCL pulses, transmits the 7-bit address and the read/write direction bit R/W on the SDA line. During all transmissions, the master ensures that the data is valid. A valid data condition requires the SDA line to be stable during the entire high period of the clock pulse (see Figure 16). All devices recognize the address sent by the master and compare it to their internal fixed addresses. Only the slave device with a matching address generates an Acknowledge, ACK, (see Figure 17) by pulling the SDA line low during the entire high period of the SCL cycle. Upon detecting this Acknowledge, the master knows that communication link with a slave has been established.

TPS65177 TPS65177A bit_trans_lvsbb1.gif Figure 16. Bit Transfer on the Serial Interface
TPS65177 TPS65177A ack_I2C_bus_lvsbb1.gif Figure 17. Acknowledge on the I2C Bus

The master generates further SCL cycles to either transmit data to the slave (R/W bit = 0) or receive data from the slave (R/W bit = 1). In either case, the receiver needs to acknowledge the data sent by the transmitter. So an acknowledge signal can either be generated by the master or by the slave, depending on which one is the receiver. The 9-bit valid data sequences consisting of 8-bit data and 1-bit acknowledge can continue as long as necessary. To terminate the data transfer, the master generates the STOP condition by pulling the SDA line from low to high while the SCL line is high (see Figure 18). This releases the bus and stops the communication link with the addressed slave. All I2C compatible devices must recognize the stop condition. Upon the receipt of a stop condition, all devices know that the bus is released and they wait for a START condition followed by a matching slave address.

TPS65177 TPS65177A I2C_protocol_lvsbb1.gif Figure 18. I2C Bus Protocol

Attempting to read data from register addresses not listed in the following section will result in 00h being read out.

7.6.2 Memory Description

A non-volatile EEPROM containing the initial values of the DACs and a volatile memory containing the DACs settings is implemented in the TPS65177/A. The non-volatile memory is called the Initial Value Register (IVR) and the volatile memory is called DAC Register (DR). The non-volatile IVR and the volatile DR are accessed by the same address. A Control Register (CR) is implemented to select if the IVR or the DR is addressed.

7.6.3 Read / Write Description

To read the volatile memory (DR) data the LSB (EE/DR) of the Control Register (CR) must be set to 0, to read the non-volatile EEPROM (IVR) data the LSB of the Control Register (CR) must be set to 1, then the data of the selected memory can be read.

To write data into the non-volatile EEPROM (IVR) all data registers (00h ~ 0Ch) must be programmed first and then the MSB (WED) of the Control Register (CR) must be set to 1. A dead time of 50ms is initiated during which all the register data (00h ~ 0Ch) is stored into the non-volatile EEPROM. It is not possible to write single DAC register data to the EEPROM. There should be not data flow at the I2C bus during that time because the I2C interface of the TPS65177/A is momentarily not responding. When the 50ms have passed the WED bit is automatically reset to 0.

7.6.4 Write Operation

7.6.4.1 Write Single Byte to the DAC Register (DR):

  1. Master sends START condition on the bus
  2. Master sends the TPS65177/A address 010000A0 and R/W bit = Low
    TPS65177/A will Acknowledge this byte
  3. Send DAC register address (e.g. 01h, address of VAVDD)
    TPS65177/A will Acknowledge this byte
  4. Send the data byte to be written to the DAC register
    TPS65177/A will Acknowledge this byte
  5. Master sends STOP condition on the bus

Example: Writing 0Fh (15 V) to the DAC address 01h (Boost converter V(AVDD))

START 0 1 0 0 0 0 A0 0 SLAVE ACK 0 0 0 0 0 0 0 1 SLAVE ACK 0 0 0 0 1 1 1 1 SLAVE ACK STOP

7.6.4.2 Write Multiple Bytes to the DAC Register (DR):

  1. Master sends START condition on the bus
  2. Master sends the TPS65177/A address 010000A0 and R/W bit = Low
    TPS65177/A will Acknowledge this byte
  3. Send DAC register address (e.g. 01h, address of VAVDD)
    TPS65177/A will Acknowledge this byte
  4. Send the data byte to be written to the DAC register
    TPS65177/A will Acknowledge this byte
  5. Master continues sending data bytes to be written to the DA registers
    (DAC register address pointer will automatically increase)
  6. Master sends STOP condition on the bus

Example: Writing 0Fh, 05h, 00h to the DAC addresses 01h, 02h, 03h (V(AVDD), HVS, Current limit)

START 0 1 0 0 0 0 A0 0 SLAVE ACK 0 0 0 0 0 0 0 1 SLAVE ACK 0 0 0 0 1 1 1 1 SLAVE ACK
0 0 0 0 0 1 0 1 SLAVE ACK 0 0 0 0 0 0 0 0 STOP

7.6.4.3 Write All DAC Register (DR) Data to EEPROM (EE):

  1. Master sends START condition on the bus
  2. Master sends the TPS65177/A address 010000A0 and R/W bit = Low
    TPS65177/A will Acknowledge this byte
  3. Send Control register (CR) address of FFh
    TPS65177/A will Acknowledge this byte
  4. Send 1xxxxxxx to enable data copy from DAC registers (DR) to EEPROM (EE)
    TPS65177/A will Acknowledge this byte
  5. Master sends STOP condition on the bus

Example: Writing all DAC registers data to the EEPROM

START 0 1 0 0 0 0 A0 0 SLAVE
ACK		 1 1 1 1 1 1 1 1 SLAVE
ACK		 1 x x x x x x x SLAVE
ACK		 STOP

7.6.5 READ OPERATION

7.6.5.1 Read single data from DAC register (DR):

  1. Master sends START condition on the bus
  2. Master sends the TPS65177/A address 010000A0 and R/W bit = Low
    TPS65177/A will Acknowledge this byte
  3. Send Control register (CR) address of FFh
    TPS65177/A will Acknowledge this byte
  4. Send data byte of 00h (EE/ DR bit) to specify that the data is read from the DAC register
    TPS65177/A will Acknowledge this byte
  5. Master sends STOP condition on the bus
  6. Master sends START condition on the bus
  7. Master sends the TPS65177/A address 010000A0 and R/W bit = Low
    TPS65177/A will Acknowledge this byte
  8. Send desired DAC register address to be read (00h~0Ch or FEh)
    TPS65177/A will Acknowledge this byte
  9. Master re-sends START condition on the bus
  10. Master sends the TPS65177/A address 010000A0 and R/W bit = High
    TPS65177/A will Acknowledge this byte
  11. Read data from DAC register
    Master will not-Acknowledge this byte
  12. Master sends STOP condition on the bus

Example: Reading data from the DAC register (DR) address 01h (V(AVDD))

START 0 1 0 0 0 0 A0 0 SLAVE
ACK		 1 1 1 1 1 1 1 1 SLAVE
ACK		 0 0 0 0 0 0 0 0 SLAVE
ACK		 STOP
START 0 1 0 0 0 0 A0 0 SLAVE
ACK		 0 0 0 0 0 0 0 1 SLAVE
ACK
START 0 1 0 0 0 0 A0 1 SLAVE
ACK		 D D D D D D D D MASTER
N-ACK		 STOP

7.6.5.2 Read Multiple Data from DAC Register (DR):

  1. Master sends START condition on the bus
  2. Master sends the TPS65177/A address 010000A0 and R/W bit = Low
    TPS65177/A will Acknowledge this byte
  3. Send Control register (CR) address of FFh
    TPS65177/A will Acknowledge this byte
  4. Send data byte of 00h (EE/ DR bit) to specify that the data is read from the DAC register
    TPS65177/A will Acknowledge this byte
  5. Master sends STOP condition on the bus
  6. Master sends START condition on the bus
  7. Master sends the TPS65177/A address 010000A0 and R/W bit = Low
    TPS65177/A will Acknowledge this byte
  8. Send desired DAC register address to be read (00h~0Ch or FEh)
    TPS65177/A will Acknowledge this byte
  9. Master re-sends START condition on the bus
  10. Master sends the TPS65177/A address 010000A0 and R/W bit = High
    TPS65177/A will Acknowledge this byte
  11. Continue read data from the DAC register, the address pointer will increase automatically
    Master will not-Acknowledge this byte
  12. Master will not-acknowledge (N-ACK) after received the last reading data
  13. Master sends STOP condition on the bus

Writing 0Fh, 05h, 00h to the DAC addresses 01h, 02h, 03h (V(AVDD), HVS, Current limit)

START 0 1 0 0 0 0 A0 0 SLAVE
ACK		 1 1 1 1 1 1 1 1 SLAVE
ACK		 0 0 0 0 0 0 0 0 SLAVE
ACK		 STOP
START 0 1 0 0 0 0 A0 0 SLAVE
ACK		 0 0 0 0 0 0 0 1 SLAVE
ACK
START 0 1 0 0 0 0 A0 1 SLAVE
ACK		 D D D D D D D D MASTER
ACK		 D D D D D D D D MASTER ACK
D D D D D D D D MASTER
N-ACK		 STOP

7.6.5.3 Read Single Data to EEPROM (EE):

  1. Master sends START condition on the bus
  2. Master sends the TPS65177/A address 010000A0 and R/W bit = Low
    TPS65177/A will Acknowledge this byte
  3. Send Control register (CR) address of FFh
    TPS65177/A will Acknowledge this byte
  4. Send data byte of 00h (EE/ DR bit) to specify that the data is read from the EEPROM
    TPS65177/A will Acknowledge this byte
  5. Master sends STOP condition on the bus
  6. Master sends START condition on the bus
  7. Master sends the TPS65177/A address 010000A0 and R/W bit = Low
    TPS65177/A will Acknowledge this byte
  8. Send desired EEPROM register address to be read (00h~0Ch or FEh)
    TPS65177/A will Acknowledge this byte
  9. Master re-sends START condition on the bus
  10. Master sends the TPS65177/A address 010000A0 and R/W bit = High
    TPS65177/A will Acknowledge this byte
  11. Read data from EEPROM
    Master will not-Acknowledge this byte
  12. Master sends STOP condition on the bus

Example: Reading data from the EEPROM (EE) addresses 01h, 02h, 03h (V(AVDD), HVS, Current limit)

START 0 1 0 0 0 0 A0 0 SLAVE
ACK		 1 1 1 1 1 1 1 1 SLAVE
ACK		 0 0 0 0 0 0 0 1 SLAVE
ACK		 STOP
START 0 1 0 0 0 0 A0 0 SLAVE
ACK		 0 0 0 0 0 0 0 1 SLAVE
ACK
START 0 1 0 0 0 0 A0 0 SLAVE
ACK		 D D D D D D D D MASTER
N-ACK		 STOP

7.6.5.4 Read Multiple Data to EEPROM (EE):

  1. Master sends START condition on the bus
  2. Master sends the TPS65177/A address 010000A0 and R/W bit = Low
    TPS65177/A will Acknowledge this byte
  3. Send Control register (CR) address of FFh
    TPS65177/A will Acknowledge this byte
  4. Send data byte of 00h (EE/ DR bit) to specify that the data is read from the EEPROM
    TPS65177/A will Acknowledge this byte
  5. Master sends STOP condition on the bus
  6. Master sends START condition on the bus
  7. Master sends the TPS65177/A address 010000A0 and R/W bit = Low
    TPS65177/A will Acknowledge this byte
  8. Send desired EEPROM register address to be read (00h~0Ch or FEh)
    TPS65177/A will Acknowledge this byte
  9. Master re-sends START condition on the bus
  10. Master sends the TPS65177/A address 010000A0 and R/W bit = High
    TPS65177/A will Acknowledge this byte
  11. Continue read data from the EEPROM, the address pointer will increase automatically
    Master will not-Acknowledge this byte
  12. Master will not-acknowledge (N-ACK) after received the last reading data
  13. Master sends STOP condition on the bus

Example: Reading data from the EEPROM (EE) addresses 01h, 02h, 03h (V(AVDD), HVS, Current limit)

START 0 1 0 0 0 0 A0 0 SLAVE
ACK		 1 1 1 1 1 1 1 1 SLAVE
ACK		 0 0 0 0 0 0 0 1 SLAVE
ACK		 STOP
START 0 1 0 0 0 0 A0 0 SLAVE
ACK		 0 0 0 0 0 0 0 1 SLAVE
ACK
START 0 1 0 0 0 0 A0 1 SLAVE
ACK		 D D D D D D D D MASTER
N-ACK		 D D D D D D D D MASTER ACK
D D D D D D D D MASTER
N-ACK		 STOP

7.6.6 Write Single Data to DAC:

TPS65177 TPS65177A wrt_data_lvsap8.gif

7.6.7 Write Multiple Data to DAC (Auto Increment Address):

TPS65177 TPS65177A wrt_FS_mode_lvsap8.gif

7.6.8 Write all DAC Data to EEPROM:

TPS65177 TPS65177A wrt_EEPROM_lvsap8.gif

7.6.9 Read Single Data From DAC / EEPROM:

TPS65177 TPS65177A read_EEPROM_lvsap8.gif

7.6.10 Read Multiple Data fFom DAC / EEPROM (Auto Increment Address):

TPS65177 TPS65177A read_FS_lvsap8.gif

7.7 Register Map

7.7.1 Registers and DAC Settings

Table 3. Device address with A0 selection pin (A0 = 0 or 1)

MSB TPS65177/A Address LSB
0 1 0 0 0 0 A0 R/W

Table 4. Control Register FFh (Factory value 00h)

MSB Address FFh LSB
WED
(Write EEPROM Data)		 Reserved Reserved Reserved Reserved Reserved Reserved EE/ DR
(Read EEPROM or DR)

Table 5. Register Map

Register Name Address Factory value Bit count Steps count
Cannel Channel Disable 00h 00h 6 64
Boost Output voltage V(AVDD) 01h 0Fh 6 64
HVS offset 02h 05h 4 16
Current Limit 03h 00h 3 8
Soft-start time 04h 00h 1 2
Buck 1 Output voltage V(IO) 05h 03h 4 16
Buck 2 Output voltage V(CORE) 06h 02h 5 32
Buck 3 Output voltage V(HAVDD) 07h 1Bh 6 64
Pos. CP Output voltage V(GH_L) 08h 08h 4 16
V(GH_L) to V(GH_H) offset voltage V(GH_OFS) 09h 04h 4 16
GPM GPM limit voltage 0Ah 00h 2 4
Neg. CP Output voltage V(GL) 0Bh 04h 4 16
Buck 3 HVS offset 0Ch 00h 4 16
Memory Memory write remain time FEh Fh 4 16
Control Control register FFh 00h 8 256

7.7.1.1 Channel Register (with factory value) – 00h (00h)

MSB Address 00h LSB
Reserved Reserved 0 0 0 0 0 0
MSB Address 00h LSB
Reserved Reserved V(CORE) V(HAVDD) V(GH) V(GL) GPM NTC
Enable: 0 Enable: 0 Enable: 0 Enable: 0 Enable: 0 Enable: 0
Disable:1 Disable:1 Disable:1 Disable:1 Disable:1 Disable:1

7.7.1.2 Boost Output Voltage V(AVDD) Register (with factory value) – 01h (0Fh)

MSB Address 01h LSB
Reserved Reserved 0 0 1 1 1 1
DAC Value V(AVDD) DAC Value V(AVDD) DAC Value V(AVDD) DAC Value V(AVDD)
00h 13.5 V 10h 15.1 V 20h 16.7 V 30h 18.3 V
01h 13.6 V 11h 15.2 V 21h 16.8 V 31h 18.4 V
02h 13.7 V 12h 15.3 V 22h 16.9 V 32h 18.5 V
03h 13.8 V 13h 15.4 V 23h 17.0 V 33h 18.6 V
04h 13.9 V 14h 15.5 V 24h 17.1 V 34h 18.7 V
05h 14.0 V 15h 15.6 V 25h 17.2 V 35h 18.8 V
06h 14.1 V 16h 15.7 V 26h 17.3 V 36h 18.9 V
07h 14.2 V 17h 15.8 V 27h 17.4 V 37h 19.0 V
08h 14.3 V 18h 15.9 V 28h 17.5 V 38h 19.1 V
09h 14.4 V 19h 16.0 V 29h 17.6 V 39h 19.2 V
0Ah 14.5 V 1Ah 16.1 V 2Ah 17.7 V 3Ah 19.3 V
0Bh 14.6 V 1Bh 16.2 V 2Bh 17.8 V 3Bh 19.4 V
0Ch 14.7 V 1Ch 16.3 V 2Ch 17.9 V 3Ch 19.5 V
0Dh 14.8 V 1Dh 16.4 V 2Dh 18.0 V 3Dh 19.6 V
0Eh 14.9 V 1Eh 16.5 V 2Eh 18.1 V 3Eh 19.7 V
0Fh 15.0 V 1Fh 16.6 V 2Fh 18.2 V 3Fh 19.8 V

7.7.1.3 Boost HVS Offset Voltage Register (with factory value) – 02h (05h)

MSB Address 01h LSB
Reserved Reserved Reserved Reserved 0 1 0 1
DAC Value V(OFFSET) DAC Value V(OFFSET) DAC Value V(OFFSET) DAC Value V(OFFSET)
00h 0.0 V 04h 0.8 V 08h 1.6 V 0Ch 2.4 V
01h 0.2 V 05h 1.0 V 09h 1.8 V 0Dh 2.6 V
02h 0.4 V 06h 1.2 V 0Ah 2.0 V 0Eh 2.8 V
03h 0.6 V 07h 1.4 V 0Bh 2.2 V 0Fh 3.0 V

7.7.1.4 Boost Current Limit Negative Offset Current Register (with factory value) – 03h (00h)

MSB Address 03h LSB
Reserved Reserved Reserved Reserved Reserved 0 0 0
DAC Value I(OFFSET) DAC Value I(OFFSET) DAC Value I(OFFSET) DAC Value I(OFFSET)
00h 0.0 A 02h 0.8 A 04h 1.6 A 06h 2.4 A
01h 0.4 A 03h 1.2 A 05h 2.0 A 07h 2.8 A

7.7.1.5 Boost Soft-start Time Register (with factory value) – 04h (00h)

MSB Address 04h LSB
Reserved Reserved Reserved Reserved Reserved Reserved Reserved 0
DAC Value Time
00h 10 ms
01h 20 ms

7.7.1.6 Buck 1 Output Voltage V(IO) Register (with factory value) – 05h (03h):

MSB Address 05h LSB
Reserved Reserved Reserved Reserved 0 0 1 1
DAC Value V(IO) DAC Value V(IO) DAC Value V(IO) DAC Value V(IO)
00h 2.2 V 04h 2.6 V 08h 3.0 V 0Ch 3.4 V
01h 2.3 V 05h 2.7 V 09h 3.1 V 0Dh 3.5 V
02h 2.4 V 06h 2.8 V 0Ah 3.2 V 0Eh 3.6 V
03h 2.5 V 07h 2.9 V 0Bh 3.3 V 0Fh 3.7 V

7.7.1.7 Buck 2 Output Voltage V(CORE) Register (with factory value) – 06h (02h)

MSB Address 06h LSB
Reserved Reserved Reserved 0 0 0 1 0
DAC Value V(CORE) DAC Value V(CORE) DAC Value V(CORE) DAC Value V(CORE)
00h 0.8 V 07h 1.5 V 0Eh 2.2 V 15h 2.9 V
01h 0.9 V 08h 1.6 V 0Fh 2.3 V 16h 3.0 V
02h 1.0 V 09h 1.7 V 10h 2.4 V 17h 3.1 V
03h 1.1 V 0Ah 1.8 V 11h 2.5 V 18h 3.2 V
04h 1.2 V 0Bh 1.9 V 12h 2.6 V 19h 3.3 V
05h 1.3 V 0Ch 2.0 V 13h 2.7 V
06h 1.4 V 0Dh 2.1 V 14h 2.8 V

7.7.1.8 Buck 3 Output Voltage V(HAVDD) Register (with factory value) – 07h (1Bh)

MSB Address 07h LSB
Reserved Reserved 0 1 1 0 1 1
DAC Value V(HAVDD) DAC Value V(HAVDD) DAC Value V(HAVDD) DAC Value V(HAVDD)
00h 4.8 V 10h 6.4 V 20h 8.0 V 30h 9.6 V
01h 4.9 V 11h 6.5 V 21h 8.1 V 31h 9.7 V
02h 5.0 V 12h 6.6 V 22h 8.2 V 32h 9.8 V
03h 5.1 V 13h 6.7 V 23h 8.3 V 33h 9.9 V
04h 5.2 V 14h 6.8 V 24h 8.4 V 34h 10.0 V
05h 5.3 V 15h 6.9 V 25h 8.5 V 35h 10.1 V
06h 5.4 V 16h 7.0 V 26h 8.6 V 36h 10.2 V
07h 5.5 V 17h 7.1 V 27h 8.7 V 37h 10.3 V
08h 5.6 V 18h 7.2 V 28h 8.8 V 38h 10.4 V
09h 5.7 V 19h 7.3 V 29h 8.9 V 39h 10.5 V
0Ah 5.8 V 1Ah 7.4 V 2Ah 9.0 V 3Ah 10.6 V
0Bh 5.9 V 1Bh 7.5 V 2Bh 9.1 V 3Bh 10.7 V
0Ch 6.0 V 1Ch 7.6 V 2Ch 9.2 V 3Ch 10.8 V
0Dh 6.1 V 1Dh 7.7 V 2Dh 9.3 V 3Dh 10.9 V
0Eh 6.2 V 1Eh 7.8 V 2Eh 9.4 V 3Eh 11.0 V
0Fh 6.3 V 1Fh 7.9 V 2Fh 9.5 V 3Fh 11.1 V

7.7.1.9 Pos. Charge Pump Low Output Voltage V(GH_L) Register (with factory value) – 08h (08h):

MSB Address 08h LSB
Reserved Reserved Reserved Reserved 1 0 0 0
DAC Value V(GH_L) DAC Value V(GH_L) DAC Value V(GH_L) DAC Value V(GH_L)
00h 20 V 04h 24 V 08h 28 V 0Ch 32 V
01h 21 V 05h 25 V 09h 29 V 0Dh 33 V
02h 22 V 06h 26 V 0Ah 30 V 0Eh 34 V
03h 23 V 07h 27 V 0Bh 31 V 0Fh 35 V

7.7.1.10 Positive Charge Pump Low Output Voltage V(GH_L) to V(GH_H) Positive Offset Voltage V(GH_OFS) Register (with factory value) – 09h (04h):

MSB Address 09h LSB
Reserved Reserved Reserved Reserved 0 1 0 0
DAC Value V(GH_L) DAC Value V(GH_L) DAC Value V(GH_L) DAC Value V(GH_L)
00h 0 V 04h 4 V 08h 8 V 0Ch 12 V
01h 1 V 05h 5 V 09h 9 V 0Dh 13 V
02h 2 V 06h 6 V 0Ah 10 V 0Eh 14 V
03h 3 V 07h 7 V 0Bh 11 V 0Fh 15 V

7.7.1.11 Gate Pulse Modulation Limit Voltage Register (with factory value) – 0Ah (00h)

MSB Address 0Ah LSB
Reserved Reserved Reserved Reserved Reserved Reserved 0 0
DAC Value Limit DAC Value Limit
00h 0 V 02h 10 V
01h 5 V 03h 15 V

7.7.1.12 Negative Charge Pump Output Voltage V(GL) Register (with factory value) – 0Bh (04h)

MSB Address 05h LSB
Reserved Reserved Reserved Reserved 0 1 0 0
DAC Value V(GL) DAC Value V(GL) DAC Value V(GL) DAC Value V(GL)
00h –5.5 V 04h –7.9 V 08h –10.3 V 0Ch –12.7 V
01h –6.1 V 05h –8.5 V 09h –10.9 V 0Dh –13.3 V
02h –6.7 V 06h –9.1 V 0Ah –11.5 V 0Eh –13.9 V
03h –7.3 V 07h –9.7 V 0Bh –12.1 V 0Fh –14.5 V

7.7.1.13 Buck 3 HVS Offset Voltage Register (with factory value) – 0Ch (00h):

MSB Address 0Ch LSB
Reserved Reserved Reserved Reserved 0 0 0 0
DAC Value V(OFFSET) DAC Value V(OFFSET) DAC Value V(OFFSET) DAC Value V(OFFSET)
00h 0.0 V 04h 0.4 V 08h 0.8 V 0Ch 1.2 V
01h 0.1 V 05h 0.5 V 09h 0.9 V 0Dh 1.3 V
02h 0.2 V 06h 0.6 V 0Ah 1.0 V 0Eh 1.4 V
03h 0.3 V 07h 0.7 V 0Bh 1.1 V 0Fh 1.5 V

7.7.1.14 Memory Write Remain Time Register (with factory value) – FEh (0Fh):

MSB Address FEh LSB
Reserved Reserved Reserved Reserved 1 1 1 1
DAC Value Remaining Writes DAC Value Remaining Writes DAC Value Remaining Writes DAC Value Remaining Writes
00h 0 04h 4 08h 8 0Ch 12
01h 1 05h 5 09h 9 0Dh 13
02h 2 06h 6 0Ah 10 0Eh 14
03h 3 07h 7 0Bh 11 0Fh EEPROM