SLVSCK1A April   2014  – April 2014 TPS65980

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Simplified Schematic
  5. Revision History
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Timing Diagrams
    8. 7.8 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 2.5-V to 15.75-V Input
      2. 8.3.2 3.3-V Outputs
      3. 8.3.3 Thermal Shutdown
      4. 8.3.4 Cable Power Out Current Limit
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation with 2.5 V ≤ VTBT_IN ≤ 3.4 V
      2. 8.4.2 Operation with 10 V ≤ VTBT_IN ≤ 15.75 V
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Single-Port Bus-Powered Thunderbolt™ Device
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Performance Plots
      2. 9.2.2 Dual-Port Bus-Powered Thunderbolt™ Device
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Performance Plots
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Trademarks
    2. 12.2 Electrostatic Discharge Caution
    3. 12.3 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature (unless otherwise noted)(1)
MIN MAX UNIT
Input voltage range(2) TBT_IN –0.3 18 V
DEV_EN –0.3 3.6
BOOT –0.3 25
BOOT (10 ns transient) –0.3 27
BOOT (vs SW) –0.3 7
SW –0.6 18
SW (10 ns transient) –2 20
COMP –0.3 3.6
SS –0.3 3.6
CBL_ILIMIT –0.3 3.6
CPP –0.3 7.2
CPN –0.3 3.6
Output voltage range(2) TBT_OUT, CBL_OUT, DEV_OUT –0.3 3.6 V
RESET, HV_OK –0.3 3.6
Vdiff Voltage from GND to Thermal Pad –0.2 0.2 V
Voltage from PGND to GND –0.2 0.2 V
TA Operating ambient temperature –40 85 °C
TJ Operating junction temperature –40 125 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to network ground pin.

7.2 Handling Ratings

MIN MAX UNIT
Tstg Storage temperature range –55 150 °C
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) 0 2 kV
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2) 0 500 V
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditions

over operating free-air temperature (unless otherwise noted)
MIN MAX UNIT
TBT_IN Supply input voltage range 2.5 15.75 V
VI Input voltage range DEV_EN –0.1 3.6
BOOT –0.1 25
SW –0.6 16.5
COMP –0.1 3.6
SS –0.1 3.6
CBL_ILIMIT –0.1 3.6
CPP –0.1 7.2
CPN –0.1 3.6
VO Output voltage range TBT_OUT, CBL_OUT, DEV_OUT –0.1 3.6 V
RESET, HV_OK –0.1 3.6
TA Operating free-air temperature –40 85 °C
TJ Operating junction temperature –40 125 °C

7.4 Thermal Information

THERMAL METRIC(1) TPS65980 UNIT
RHF
24 PIN
RθJA Junction-to-ambient thermal resistance 30.1 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 26.9
RθJB Junction-to-board thermal resistance 8.2
ψJT Junction-to-top characterization parameter 0.3
ψJB Junction-to-board characterization parameter 8.2
RθJC(bot) Junction-to-case (bottom) thermal resistance 1.5
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

7.5 Electrical Characteristics

Unless otherwise noted all specifications applies over the VTBT_IN range and operating ambient temperature of
–40°C ≤ TA ≤ 85°C, CTBT_IN = 22 µF, CTBT_OUT = 10 µF, CCBL_OUT = 1 µF, CSS = 10 nF, and 33 V/µs logic input transitions. Typical values are for VTBT_IN = 12 V and TA = 25°C.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
POWER SUPPLIES AND CURRENTS
VTBT_IN TBT_IN Input voltage range 2.5 12 15.75 V
VREF_RSTN TBT_OUT to RESET clear high TBT_OUT rising 3 3.1 3.2 V
TBT_OUT to RESET assert low TBT_OUT falling 2.5 2.6 2.7
VHVTR TBT_IN to HV_OK assert TBT_IN rising 4.36 4.5 4.64 V
VHVTHYST TBT_IN to HV_OK clear TBT_IN Falling hysteresis 100 mV
SR02L TBT_IN Input slew rate TBT_IN transition from 0 V to 3.3 V 0.1 30 kV/s
SRL2H TBT_IN Input slew rate TBT_IN transition from 3.3 V to 15 V 0.1 30 kV/s
IRAMP Combined output di/dt(1) 5 kA/s
Efficiency Buck converter efficiency ILOADTOTAL = 3 A, VTBT_IN = 12 V 87%
Charge pump efficiency VTBT_IN = 3.3 V, ILOADTOTAL = 25 mA 47%
POWER OUTPUT PINS (LOW VOLTAGE INPUT)(2)
VTBT_IN TBT_IN Input voltage range 2.5 3.3 3.4 V
VTBT_OUT TBT_OUT Output voltage range(3) 3.135 3.25 3.4 V
ITBT_OUT TBT_OUT Load current(4)(5) RESET high 5 50 mA
RESET low 100 µA
POWER OUTPUT PINS (HIGH VOLTAGE INPUT)(6)
VTBT_IN TBT_IN Input voltage range 10 12 15.75 V
VTBT_OUT TBT_OUT Output voltage range(3) I_LOADTOTAL = 1 A to 3.5 A 3.221 3.27 3.319 V
I_LOADTOTAL = 0.235 A to 3.5 A 3.221 3.27 3.42
ITBT_OUT TBT_OUT Load current(4) 235 1000 mA
VCBL_OUT CBL_OUT Output voltage range(3) ILIMIT = 0, ICBL_OUT = 0 to 720 mA 3.171 3.27 3.319 V
ILIMIT = 1, ICBL_OUT = 0 to 1.44 A 3.12 3.27 3.319
VDEV_OUT DEV_OUT Output Voltage Range IDEV_OUT = 0 to 2500 mA 3 3.27 3.319 V
POWER OUTPUT PINS (HIGH VOLTAGE INPUT DURING SYSTEM SLEEP)
VTBT_IN TBT_IN Input voltage range 5.2 12 15.75 V
VTBT_OUT TBT_OUT DC Output voltage range I_LOADTOTAL = 1 A to 3.5 A 3.221 3.27 3.319 V
I_LOADTOTAL = 0.235 A to 3.5 A 3.221 3.27 3.42
ITBT_OUT TBT_OUT Load current 5 31 mA
VCBL_OUT CBL_OUT Output voltage range(3) ICBL_OUT = 0 to 235 mA 3.171 3.27 3.319 V
VDEV_OUT DEV_OUT Output voltage range IDEV_OUT = 0 to 700 mA 3 3.3 3.319 V
CABLE OUTPUT (HIGH VOLTAGE INPUT & HIGH VOLTAGE INPUT DURING SLEEP)
VCBL_OUT_MON CBL_OUT Ramp-up monotonicity(7) CBL_OUT ramp from off to on 0 mV
VCBL_OUT_RIP CBL_OUT Voltage ripple After settling
All output combined Load > 1 mA
2 %P-P
All output combined Load < 1 mA 40 mVP=P
ILIM_CBLOUT CBL_OUT Current limit ILIMIT = 0 0.8 1.1 1.4 A
ILIMIT = 1 1.6 2.2 2.8
tLIM_CBLOUT Short circuit response time RCBL_OUT = 0.5 Ω to GND, ILIMIT = 0 500 µs
RCBL_OUT = 0.01 Ω to GND, ILIMIT = 0 8
DEV_EN AND ILIMIT INPUT LOGIC
VIH High-level input voltage 2.6 V
VIL Low-level input voltage 0.6 V
IIN Input leakage to GND VDEV_EN = 3.3V 1 mA
RESET AND HV_OK OUTPUT LOGIC
VOH High-level output voltage IL = –1.5 mA, Referenced to VTBT_OUT –250 0 mV
VOL Low-level output voltage IL = 1.5 mA 0 250 mV
SOFT START(3)
IINRUSH Inrush current di/dt 250 kA/s
THERMAL SHUTDOWN
TSD Shutdown temperature 120 135 150 °C
TSDHYST Shutdown hysteresis 10 °C
(1) The three voltage outputs (TBT_OUT, CBL_OUT, DEV_OUT) all pull current from a single node. Therefore, the total combined current cannot exceed the maximum di/dt.
(2) CBL_OUT and DEV_OUT are open (high impedance) for this input voltage range.
(3) During light load conditions, the average output voltage may reach 3.5 V with peaks not exceeding 3.42 V.
(4) TBT_OUT load current flows from the TBT_OUT pin when the device is in charge pump mode and pulls the buck converter inductor when the device is in buck mode.
(5) TBT_OUT load current will not go higher than 50mA until after the device asserts HV_OK.
(6) The maximum current supplied by the TPS65980 to all outputs is limited to 3.5 A. Max power depends on the Thunderbolt™ system and how much power is supplied to the input.
(7) A monotonicity of 0 mV means that the output does not have a negative going ramp at anytime during its power up ramp. A ripple of up to 62 mV from the DC/DC will occur.

7.6 Timing Requirements

MIN TYP MAX UNIT
tIN2OR TBT_IN to TBT_OUT On Time VTBT_IN ≥ 0.9 × VTBT_IN(min) to
VTBT_OUT ≥ 0.99 × VTBT_OUT(min)
RTBT_OUT = 100 Ω
20 ms
tIN2OF TBT_IN to TBT_OUT Off Time VTBT_IN ≤ 0.9 × VTBT_IN(min) to
VTBT_OUT ≤ 0.1 × VTBT_OUT(min)
RTBT_OUT = 100 Ω
2.4 4 ms
tOUT2RR TBT_OUT to RESETZ High time VTBT_OUT ≥ VREF_RSTN(max) rising to
VRESET = 0.9 × VOH, CRESETN = 100 pF
20 µs
tIN2RF TBT_IN to RESETZ Low time VTBT_IN ≤ 0.9 × VTBT_IN(min) to
VRESET = 0.1 × VOH, CRESETN = 100 pF
20 ms
tHV2OKR TBT_IN Rise to HV_OK VTBT_IN ≥ VHVTR to VHV_OK = 0.9 × VOH
CHV_OK = 100 pF
10 µs
tHV2OKF TBT_IN Fall to HV_OK VTBT_IN ≤ VHVTR-VHVTHYST to
VHV_OK = 0.1 × VOH, CHV_OK = 100 pF
10 µs
tHV2CR(1)(2) HV_OK to CBL_OUT On time VHV_OK ≥ 1.65 V to VCBL_OUT = 2.95 V
RCB_OUT = 100 Ω, CHV_OK = 100 pF
0.1 10 ms
tHV2CF HV_OK to CBL_OUT Off time VHV_OK ≤ 1.65 V to VCBL_OUT = 2.95 V
RCB_OUT = 100 Ω, CHV_OK = 100 pF
40 µs
tRCBL CABLE_OUT Ramp time VCBL_OUT ramp 10% to 90%
CCBL_OUT = 0 to 52 µF
0.1 10 ms
tDEVEN DEV_EN to DEV_OUT On time VDEV_EN ≤ 1.65 V to VDEV_OUT = 2.7 V
RDEV_OUT = 100 Ω
0.1 10 ms
tDEVDIS DEV_EN to DEV_OUT Off time VDEV_EN ≥ 1.65V to VDEV_OUT = 2.7 V
RDEV_OUT = 100 Ω
50 ms
tHV2DEVEN Wait time from HV_OK High before DEV_EN can be asserted low(2) VHV_OK ≥ 1.65 V to VDEV_EN ≤ 1.65 V
CHV_OK = 100 pF
2 ms
(1) TBT_IN must transition from 3.3 V to high voltage, not from 0 V to high voltage
(2) During the transition from low voltage input to high voltage input, the total load of all outputs combined can not exceed 85 mA until 2 ms after HV_OK asserts high.
(3) The charge pump will limit the normal ramp of current. Soft start will control the inrush current when the input ramps from 0 V to high voltage (not a normal operating condition). See recommended components section for required soft-start cap.

7.7 Timing Diagrams

tbt_slew_slvsck1.gifFigure 1. TBT_IN Slew Rates

The TPS65980 has two normal operating regions. The first region is when 2.5 V ≤ VTBT_IN ≤ 3.4 V. This is the normal power-up state and is termed the low-voltage state. When the input transitions to this range, the input slew rate must meet the SR02L limits. In this voltage range, the TPS65980 operates with a charge pump to generate the nominally 3.3 V output. When the input voltage moves to the higher end of this range, the buck converter takes over to produce the 3.3 V. In normal operation, the TPS65980 input voltage will transition from the low-voltage range to a high-voltage range where 10 V ≤ VTBT_IN ≤ 15.75 V. This is the high-voltage state and is the state where the TPS65980 will operate most of the time. In this state, the device operates as a buck converter providing a nominally 3.3 V output. Figure 1 shows the input voltage transitions and states.

timing_slvsck1.gifFigure 2. Timing Diagram

Figure 2 shows normal operating timing diagram for the TBT_OUT output voltage and the RESET and HV_OK output indicator signals. When TBT_IN transitions to the low-voltage range, TBT_OUT will power up a short time later. Once TBT_OUT reaches the normal output range, RESET will transition high. However, timing for RESET is measured from the input TBT_IN transitioning high. When TBT_IN transitions from the low-voltage input range to the high-voltage input range, HV_OK will transition high. RESET is an active-high output indicating that the TBT_OUT voltage is valid and. HV_OK is an active-high output indicating that the TBT_IN voltage is in the high-voltage range. When in the high-voltage state, the TPS65980 can provide much higher output current than when in the low-voltage state.

When the TBT_IN input transitions from high-voltage to low-voltage, HV_OK will de-assert to a logic low. When the TBT_IN input voltage falls below the minimum operating voltage, the RESET output will de-assert low.

timing2_slvsck1.gifFigure 3. Timing Diagram

Figure 3 shows the CBL_OUT and DEV_OUT outputs and timing based on the HV_OK signal and the DEV_ENZ input. The CBL_OUT output will be connected to TBT_OUT and supplying 3.3V when HV_OK is asserting high. The DEV_OUT output will be connected to TBT_OUT and supplying 3.3 V when HV_OK is asserting high and the DEV_ENZ input is low.

7.8 Typical Characteristics

D001_SLVSCK1.gif
Figure 4. Low Voltage Efficiency
D003_SLVSCK1.gif
Figure 6. High Voltage Efficiency (Active)
D005_SLVSCK1.gif
VIN = 12V
Figure 8. TBT_OUT Load Regulation
D007_SLVSCK1.gif
VIN = 12V CBL_ILIMIT = 1
Figure 10. CBL_OUT Load Regulation
D009_SLVSCK1.gif
Figure 12. TBT_OUT Line Regulation
D002_SLVSCK1.gif
Figure 5. High Voltage Efficiency (System Sleep)
D004_SLVSCK1.gif
VIN = 3.3V
Figure 7. TBT_OUT Load Regulation
D006_SLVSCK1.gif
VIN = 12V
Figure 9. DEV_OUT Load Regulation
D008_SLVSCK1.gif
VIN = 12V CBL_ILIMIT = 0
Figure 11. CBL_OUT Load Regulation