SLVSB56C May   2012  – February 2014 TPS54160 , TPS54160A

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Terminal Configuration and Functions
  7. 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 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Fixed Frequency PWM Control
      2. 8.3.2  Slope Compensation Output Current
      3. 8.3.3  Pulse Skip Eco-mode
      4. 8.3.4  Bootstrap Voltage (BOOT)
      5. 8.3.5  Low Dropout Operation
      6. 8.3.6  Error Amplifier
      7. 8.3.7  Voltage Reference
      8. 8.3.8  Adjusting the Output Voltage
      9. 8.3.9  Enable and Adjusting Undervoltage Lockout
      10. 8.3.10 Slow Start and Tracking Pin (SS/TR)
      11. 8.3.11 Overload Recovery Circuit
      12. 8.3.12 Sequencing
      13. 8.3.13 Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
      14. 8.3.14 Overcurrent Protection and Frequency Shift
      15. 8.3.15 Selecting the Switching Frequency
      16. 8.3.16 How to Interface to RT/CLK Pin
      17. 8.3.17 Power Good (PWRGD Pin)
      18. 8.3.18 Overvoltage Transient Protection
      19. 8.3.19 Thermal Shutdown
      20. 8.3.20 Small Signal Model for Loop Response
      21. 8.3.21 Simple Small Signal Model for Peak Current Mode Control
      22. 8.3.22 Small Signal Model for Frequency Compensation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation with VIN < 3.5 V (Minimum VIN)
      2. 8.4.2 Operation with EN Control
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedures
        1. 9.2.2.1  Selecting the Switching Frequency
        2. 9.2.2.2  Output Inductor Selection (LO)
        3. 9.2.2.3  Output Capacitor
        4. 9.2.2.4  Catch Diode
        5. 9.2.2.5  Input Capacitor
        6. 9.2.2.6  Slow Start Capacitor
        7. 9.2.2.7  Bootstrap Capacitor Selection
        8. 9.2.2.8  Under Voltage Lock Out Set Point
        9. 9.2.2.9  Output Voltage and Feedback Resistors Selection
        10. 9.2.2.10 Compensation
        11. 9.2.2.11 Power Dissipation Estimate
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

6 Terminal Configuration and Functions

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Terminal Functions

TERMINAL I/O DESCRIPTION
NAME NO.
BOOT 1 O A bootstrap capacitor is required between BOOT and PH. 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 pull-up current source. Pull below 1.2 V to disable. Float to enable. Adjust the input undervoltage lockout with two resistors.
GND 9 – Ground
PH 10 O The source of the internal high-side power MOSFET.
Thermal Pad 11 – GND pin must be electrically connected to the exposed pad on the printed circuit board for proper operation.
PWRGD 6 O An open drain output, asserts low if output voltage is low due to thermal shutdown, dropout, over-voltage or EN shut down.
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. If the pin is pulled above the PLL upper threshold, a mode change occurs and the pin becomes a synchronization input. The internal amplifier is disabled and the pin is a high impedance clock input to the internal PLL. If clocking edges stop, the internal amplifier is re-enabled and the mode returns to a resistor set function.
SS/TR 4 I/O Slow-start and Tracking. An external capacitor connected to this pin sets the output rise time. Since the voltage on this pin overrides the internal reference, it can be used for tracking and sequencing.
VIN 2 I Input supply voltage, 3.5 V to 60 V.
VSENSE 7 I Inverting node of the transconductance (gM) error amplifier.