SLUSCD4B March   2017  – May 2018 TPS543C20


  1. Features
  2. Applications
  3. Description
    1.     Device Images
      1.      Simplified Schematic
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
    1.     Pin Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
    4. 8.4 Device Functional Modes
      1. 8.4.1  Soft-Start Operation
      2. 8.4.2  Input and VDD Undervoltage Lockout (UVLO) Protection
      3. 8.4.3  Power Good and Enable
      4. 8.4.4  Voltage Reference
      5. 8.4.5  Prebiased Output Start-up
      6. 8.4.6  Internal Ramp Generator
        1. Ramp Selections
      7. 8.4.7  Switching Frequency
      8. 8.4.8  Clock Sync Point Selection
      9. 8.4.9  Synchronization and Stackable Configuration
      10. 8.4.10 Dual-Phase Stackable Configurations
        1. Configuration 1: Master Sync Out Clock-to-Slave
        2. Configuration 2: Master and Slave Sync to External System Clock
      11. 8.4.11 Operation Mode
      12. 8.4.12 API/BODY Brake
      13. 8.4.13 Sense and Overcurrent Protection
        1. Low-Side MOSFET Overcurrent Protection
        2. High-Side MOSFET Overcurrent Protection
      14. 8.4.14 Output Overvoltage and Undervoltage Protection
      15. 8.4.15 Overtemperature Protection
      16. 8.4.16 RSP/RSN Remote Sense Function
      17. 8.4.17 Current Sharing
      18. 8.4.18 Loss of Synchronization
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application: TPS543C20 Stand-alone Device
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. Custom Design With WEBENCH® Tools
        2. Switching Frequency Selection
        3. Inductor Selection
        4. Input Capacitor Selection
        5. Bootstrap Capacitor Selection
        6. BP Pin
        7. R-C Snubber and VIN Pin High-Frequency Bypass
        8. Output Capacitor Selection
          1. Response to a Load Transient
          2. Ramp Selection Design to Ensure Stability
      3. 9.2.3 Application Curves
    3. 9.3 System Example
      1. 9.3.1 Two-Phase Stackable
        1. Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Package Size, Efficiency and Thermal Performance
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
        1. Custom Design With WEBENCH® Tools
      2. 12.1.2 Documentation Support
        1. Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

Pin Configuration and Functions

RVF Package
40-Pin LQFN
Top View
TPS543C20 Pinouts_1_SLUSCD4.gif

Pin Functions

1 RSP I The positive input of the remote sense amplifier. Connect RSP pin to the output voltage at the load. For multi-phase configuration, the remote sense amplifier is not needed for slave devices.
2 RSN I The negative input of the remote sense amplifier. Connect RSN pin to the ground at load side. For multi-phase configuration, the remote sense amplifier is not needed for slave devices.
3 – 6 NC Not connected
7 BOOT I Bootstrap pin for the internal flying high-side driver. Connect a typical 100-nF capacitor from this pin to SW. To reduce the voltage spike at SW, a BOOT resistor with a value between 1 Ω to 10 Ω may be placed in series with the BOOT capacitor to slow down turnon of the high-side FET.
8 – 12 SW B Output of converted power. Connect this pin to the output Inductor.
13 – 20 PGND G These ground pins are connected to the return of the internal low-side MOSFET
21 – 25 PVIN I Input power to the power stage. Low impedance bypassing of these pins to PGND is critical. A 10-nF to 100-nF capacitor from PVIN to PGND close to IC is required.
26 VDD I Controller power supply input
27 GND G Ground return for the controller. This pin should be directly connected to the thermal pad on the PCB board. A 10-nF to 100-nF capacitor from PVIN to GND close to IC is required.
28 BP O Output of the 5 V on board regulator. This regulator powers the driver stage of the controller and must be bypassed with a minimum of 2.2 µF to the thermal pad (power stage ground, that is, GND). Low impedance bypassing of this pin to PGND is critical.
29 AGND G GND return for internal analog circuits.
30 ILIM O Current protection pin; connect a resistor from this pin to AGND sets current limit level.
31 ISHARE I Current sharing signal for multi-phase operation. Float this pin for single phase
32 VSHARE B Voltage sharing signal for multi-phase operation. Float this pin for single phase.
33 EN I The enable pin turns on the switcher.
34 PGD O Open-drain power-good status signal which provides start-up delay after the FB voltage falls within the specified limits. After the FB voltage moves outside the specified limits, PGOOD goes low.
35 SYNC B For frequency synchronization. This pin can be configured as sync in or sync out by MODE pin and RT pin for master and slave devices.
36 VSEL I Connect a resistor from this pin to AGND to select internal reference voltage.
37 SS O Connect a resistor from this pin to AGND to select soft-start time.
38 RT O Frequency setting pin. Connect a resistor from this pin to AGND to program the switching frequency. This pin also selects sync point for devices in stackable applications
39 MODE B Enable or disable API or body brake function, choose API threshold, also selects the operation mode in stackable applications
40 RAMP B Ramp level selection, with a resistor to AGND to adjust internal loop.
Thermal Tab Package thermal tab, internally connected to PGND. The thermal tab must have adequate solder coverage for proper operation.
I = Input, O = Output, B = Bidirectional, P = Supply, G = Ground