SLUUCL5A december   2022  – may 2023 TPS564252 , TPS564255 , TPS564257

 

  1.   Description
  2.   Features
  3.   Applications
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  6. 2Performance Specification Summary
  7. 3Output Voltage Setpoint
  8. 4Test Setup and Results
    1. 4.1 Input, Output Connections
    2. 4.2 Start-Up Procedure
    3. 4.3 Efficiency
    4. 4.4 Load Regulation
    5. 4.5 Line Regulation
    6. 4.6 Load Transient Response
    7. 4.7 Start-Up
    8. 4.8 Shutdown
    9. 4.9 Output Voltage Ripple
  9. 5Hardware Design Files
    1. 5.1 Schematic
    2. 5.2 PCB Layout
    3. 5.3 Bill of Materials
  10. 6Additional Information
    1.     Trademarks
  11. 7Reference
  12. 8Revision History

1.1 Introduction

In light-load conditions, the TPS564252 operates in Eco-mode to enable higher efficiency by varying the switching frequency, the TPS564257 operates in FCCM to maintain constant switching frequency and the TPS564255 operates in OOA mode to avoid audio noise. The main difference is at light loading, but the other behaviors are similar. This user's guide mainly introduces the TPS564252 and includes some TPS564257 and TPS564255 features that are different from the TPS564252.

The TPS56425x is a single, adaptive on-time, D-CAP3™ control mode, synchronous buck converter that requires a very low external component count. The D-CAP3 control mode circuit is optimized for low-ESR output capacitors such as POSCAP, SP-CAP, or ceramic types and features fast transient response with no external compensation. The switching frequency is internally set at a nominal 600 KHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS56425x package along with the gate-drive circuitry. The low drain-to-source on resistance of the MOSFETs and fast switching slew rate allow the TPS56425x to achieve high efficiency and help keep the junction temperature low at high output currents. Power sequencing is possible by correctly configuring the enable and power-good indicator. The TPS56425x DC/DC synchronous converter is designed to support up to a 4-A continuous current from an input voltage source of 3 V to 17 V. The output voltage range is from 0.6 V to 10 V. Rated input voltage and output current ranges for the evaluation module are given in Table 2-1.

The TPS564252EVM evaluation module (EVM) is a single, synchronous buck converter providing 1.05 V at 4 A from 3-V to 17-V input. This user’s guide describes the TPS564252EVM performance.

Table 2-1 Input Voltage and Output Current Summary
EVM INPUT VOLTAGE (VIN) RANGE OUTPUT CURRENT (IOUT) RANGE
TPS564252EVM VIN = 3 V to 17 V 0 A to 4 A
TPS564257EVM VIN = 3 V to 17 V 0 A to 4 A
TPS564255EVM VIN = 3 V to 17 V 0 A to 4 A