SLVSCX0B February   2016  – April 2016 TPS62770

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1. 5.1 Output Voltage Setting Step-Down Converter
  6. 6 Specifications
    1. 6.1 ESD Ratings
    2. 6.2 Thermal Information
    3. 6.3 Electrical Characteristics
    4. 6.4 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 Step-Down Converter Device
        1. 7.3.1.1 DCS-Control
        2. 7.3.1.2 Output Voltage Selection with pins VSEL1-VSEL3
        3. 7.3.1.3 CTRL / Output Load
        4. 7.3.1.4 Output Discharge At Pins VO1 And LOAD
        5. 7.3.1.5 Undervoltage Lockout UVLO
        6. 7.3.1.6 Short Circuit Protection
      2. 7.3.2 Step-Up Converter Device
        1. 7.3.2.1 Under-Voltage Lockout
        2. 7.3.2.2 Output Disconnect
        3. 7.3.2.3 12 V Fixed Output Voltage
        4. 7.3.2.4 Mode Selection With Pin BM
        5. 7.3.2.5 Output Overvoltage Protection
        6. 7.3.2.6 Output Short Circuit Protection
        7. 7.3.2.7 PWM to Analog Converter AT PIN EN2/PWM
    4. 7.4 Device Functional Modes
      1. 7.4.1 Step-Down Converter
        1. 7.4.1.1 Enable and Shutdown
        2. 7.4.1.2 Power Save Mode Operation
        3. 7.4.1.3 PWM Mode Operation
        4. 7.4.1.4 Device Start-up and Soft Start
        5. 7.4.1.5 Automatic Transition Into 100% Mode
      2. 7.4.2 Step-Up Converter
        1. 7.4.2.1 Enable and Shutdown
        2. 7.4.2.2 Soft Start
        3. 7.4.2.3 Power Save Mode
        4. 7.4.2.4 PWM Mode
        5. 7.4.2.5 Constant-Current Step-Up Mode Operation
        6. 7.4.2.6 Constant-Voltage Step-Up Mode Operation
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 TPS62770 Step-Down Converter + Load Switch
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Setting The Output Voltage Of The Step-Down Converter
          2. 8.2.1.2.2 Inductor Selection Step-Down Converter
          3. 8.2.1.2.3 Input and Output Capacitor Selection
        3. 8.2.1.3 Application Curves - TPS62770 Step-Down Converter + Load Switch
      2. 8.2.2 TPS62770 Step-Up Converter with Adjustable Output Voltage (9 V to 15 V)
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Programming the Output Voltage Of The Step-Up Converter
          2. 8.2.2.2.2 Inductor Selection for TPS62770 Step-Up Converter
            1. 8.2.2.2.2.1 Example Step-Up Converter with 12-V Fixed Output
        3. 8.2.2.3 Application Curves for Step-Up Converter
      3. 8.2.3 Step-Up Converter with Constant 5-V Output Voltage
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Performance Curves
      4. 8.2.4 Typical Step Up Converter with Constant Output Current
        1. 8.2.4.1 Design Requirements
        2. 8.2.4.2 Detailed Design Procedure
          1. 8.2.4.2.1 Setting the Output Current
          2. 8.2.4.2.2 Inductor Selection
        3. 8.2.4.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

5 Pin Configuration and Functions

YFP Package
16-Pin DSBGA
Top View
TPS62770 PO_TPS62770_BM_VSEL_PG1p1.gif

Table 1. Pin Functions

PIN I/O DESCRIPTION
NAME NO
EN2/PWM B3 IN Enable pin for the step-up converter. High level enables the devices, low level turns the device into shutdown mode. A PWM signal can be applied to this pin when used as a constant current driver (BM pin connected to VIN). The pin must be terminated.
GND2 A1 PWR GND supply pin for the step-up converter. Connect this pin close to the GND terminals of the input and output capacitors.
SW2 A2 IN The switch pin of the step-up converter. It is connected to the drain of the internal power MOSFET. Connect the inductor L2 between this pin and the input capacitor CIN
VO2 A3 OUT Output of the step-up converter.
BM B1 IN This pin controls the operation mode of the step-up converter. With BM = high, the device features a low feedback voltage of 200mV, which can be scaled down by the integrated PWM to analog converter. With BM = low, the device operates with a 0.8V feedback voltage and operates as a step-up converter with voltage regulation. This pin must be terminated and set before the device is enabled.
FB B4 IN Feedback pin for the step-up converter to set the output voltage / current. Connect the pin to the center tap of a resistor divider to program the output voltage. When it is connected to the VIN pin, the output voltage is set to 12 V by an internal feedback divider network. When used as a LED current driver connect the sense resistor between this pin and GND. The LED string is connected between FB pin and VO2.
EN1 C2 IN Enable pin for the step-down converter. High level enables the devices, low level turns the device into shutdown mode. The pin must be terminated.
VSEL1 C3 IN Output voltage selection pins. See Output Voltage Setting Step-Down Converter for VOUT selection. These pins must be terminated. The pins can be dynamically changed during operation.
VSEL2 B2 IN
VSEL3 A4 IN
CTRL C4 IN This pin controls the load switch between VO1 and LOAD. With CTRL = low, the LOAD switch is disabled. The pin must be terminated.
VIN D1 PWR VIN power supply pin. Connect the input capacitor close to this pin for best noise and voltage spike suppression. A ceramic capacitor of 10μF is required.
GND1 D2 PWR GND supply pin for the step-down converter. Connect this pin close to both, the GND terminal of the input and output capacitor.
SW1 C1 OUT This is the switch pin of the step-down converter and is connected to the internal MOSFET switches. Connect the inductor L1 between this terminal and the output capacitor.
VO1 D3 OUT Output of the step-down converter. The output voltage is sensed via this pin to the internal feedback divider network for the regulation loop. In addition the internal load switch is connected between VO1 pin and LOAD pin. Connect this pin directly to the output capacitor with a short trace. The pin is connected to GND1 and discharges the output capacitor when the converter is disabled.
LOAD D4 OUT Output terminal of the internal load switch. With CTRL = high, the internal load switch connects VO1 to the LOAD pin. The switch features a slew rate control. This pin is pulled to GND with the CTRL = low. If not used, leave the pin open.

5.1 Output Voltage Setting Step-Down Converter

VO1 [V] VSEL3 VSEL2 VSEL1
1.0 0 0 0
1.05 0 0 1
1.1 0 1 0
1.2 0 1 1
1.8 1 0 0
1.9 1 0 1
2.0 1 1 0
3.0 1 1 1