SLVSAP3D December   2010  – February 2016 TPS57140-Q1


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  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 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Fixed Frequency PWM Control
      2. 7.3.2  Slope-Compensation Output Current
      3. 7.3.3  Low-Dropout Operation and Bootstrap Voltage (Boot)
      4. 7.3.4  Error Amplifier
      5. 7.3.5  Voltage Reference
      6. 7.3.6  Adjusting the Output Voltage
      7. 7.3.7  Enable and Adjusting Undervoltage Lockout (UVLO)
      8. 7.3.8  Slow-Start and Tracking Pin (SS/TR)
      9. 7.3.9  Overload Recovery Circuit
      10. 7.3.10 Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
      11. 7.3.11 Overcurrent Protection and Frequency Shift
      12. 7.3.12 Selecting the Switching Frequency
      13. 7.3.13 How to Interface to RT/CLK Pin
      14. 7.3.14 Power Good (PWRGD Pin)
      15. 7.3.15 Overvoltage Transient Protection
      16. 7.3.16 Thermal Shutdown
      17. 7.3.17 Small-Signal Model for Loop Response
      18. 7.3.18 Simple Small-Signal Model for Peak-Current-Mode Control
      19. 7.3.19 Small-Signal Model for Frequency Compensation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Sequencing
      2. 7.4.2 Pulse-Skip Eco-mode
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1.  Selecting the Switching Frequency
        2.  Output Inductor Selection (LO)
        3.  Output Capacitor
        4.  Catch Diode
        5.  Input Capacitor
        6.  Slow-Start Capacitor
        7.  Bootstrap Capacitor Selection
        8.  Undervoltage Lockout (UVLO) Set Point
        9.  Output Voltage and Feedback Resistors Selection
        10. Compensation
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Power Dissipation Estimate
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resource
    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

5 Pin Configuration and Functions

DGQ Package
10-Pin MSOP-PowerPAD
Top View
TPS57140-Q1 po_DGQ_lvsa24.gif
DRC Package
10-Pin VSON
Top View
TPS57140-Q1 po_DRC_lvsa24.gif

Pin Functions

BOOT 1 O A bootstrap capacitor is required between BOOT and PH pins. If the voltage on this capacitor is below the minimum required by the device, the output is forced to switch off until the capacitor is refreshed.
COMP 8 O Error-amplifier output and input to the output-switch current comparator. Connect frequency-compensation components to this pin.
EN 3 I Enable pin, internal pullup current source. Pull below 1.2 V to disable. Float to enable. Adjust the input undervoltage lockout with two resistors.
GND 9 The GND pin is the ground pin.
PH 10 I The PH pin is the source of the internal high-side power MOSFET.
PWRGD 6 O An open-drain output, asserts low if output voltage is low due to thermal shutdown, dropout, overvoltage, or EN shutdown.
RT/CLK 5 I Resistor timing and external clock. An internal amplifier holds this pin at a fixed voltage when using an external resistor to ground to set the switching frequency. Pulling the pin above the PLL upper threshold causes a mode change whereby the pin becomes a synchronization input. Disabling of the internal amplifier occurs, and the pin is a high-impedance clock input to the internal PLL. If clocking edges stop, re-enabling of the internal amplifier occurs, and the mode returns to a resistor-set function.
SS/TR 4 I Slow-start and tracking. An external capacitor connected to this pin sets the output rise time. The voltage on this pin overrides the internal reference, allowing use of the pin for tracking and sequencing.
VIN 2 I The VIN pin is the input supply voltage which is from 3.5 to 42 V.
VSENSE 7 I The VSENSE pin is the inverting node of the transconductance (gm) error amplifier.
Thermal pad GND pin must have an electrical connection to the exposed pad on the printed-circuit board for proper operation.