SLVUDT0 February   2026 TPS564252B , TPS564255B , TPS564257B

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Performance Specification Summary
  8. 3Output Voltage Setpoint
  9. 4Hardware
    1. 4.1 Test Setup and Results
      1. 4.1.1 Input, Output Connections
      2. 4.1.2 Start-Up Procedure
      3. 4.1.3 Efficiency
      4. 4.1.4 Load Regulation
      5. 4.1.5 Line Regulation
      6. 4.1.6 Load Transient Response
      7. 4.1.7 Start-Up
      8. 4.1.8 Shutdown
      9. 4.1.9 Output Voltage Ripple
  10. 5Hardware Design Files
    1. 5.1 Schematic
    2. 5.2 PCB Layout
    3. 5.3 Bill of Materials
  11. 6Additional Information
    1. 6.1 Trademarks
  12. 7Reference

1.1 Introduction

In light-load conditions, the TPS564252B operates in Eco-mode to enable higher efficiency by varying the switching frequency, the TPS564257B operates in FCCM to maintain constant switching frequency, and the TPS564255B 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 TPS564252B and includes some TPS564257B and TPS564255B features that are different from the TPS564252B.

The TPS56425xB 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 600kHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS56425xB package along with the gate-drive circuitry. The low drain-to-source on resistance of the MOSFETs and fast switching slew rate allow the TPS56425xB 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 TPS56425xB DC/DC synchronous converter is designed to support up to a 4A continuous current from an input voltage source of 3V to 17V. The output voltage range is from 0.6V to 10V. Table 1-1 gives the rated input voltage and output current ranges for the evaluation module.

Table 1-1 Input Voltage and Output Current Summary
EVMINPUT VOLTAGE (VIN) RANGEOUTPUT CURRENT (IOUT) RANGE
TPS564252BEVMVIN = 3V to 17V0A to 4A
TPS564257BEVM
TPS564255BEVM

The TPS564252BEVM evaluation module (EVM) is a single, synchronous buck converter providing 1.05V at 4A from 3V to 17V input. This user’s guide describes the TPS564252BEVM performance.

This user's guide introduces the TPS564252BEVM, TPS564255BEVM, and TPS564257BEVM. These three devices differ in the light load behavior. The TPS564252B operates in Eco-mode, the TPS564255B operates in OOA mode, and the TPS564257B operates in FCCM mode. This user's guide contains information for the TPS564252B, TPS564255B, and TPS564257B as well as support documentation for the TPS564252BEVM, TPS564255BEVM, and TPS564257BEVM evaluation modules. This document also includes the performance specifications, board layout, schematic, and the list of materials of the TPS564252BEVM, TPS564255BEVM, and TPS564257BEVM.