SLVUDO3B March   2026  – October 2026

 

  1.   1
  2.   Description
  3.   Features
  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. 2Hardware
    1. 2.1 Test Setup
    2. 2.2 Modification
    3. 2.3 Input Capacitor C3
  7. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 PCB Layout
    3. 3.3 Bill of Materials
  8. 4Additional Information
    1. 4.1 Trademarks
  9. 5Revision History

1.1 Introduction

This user's guide describes the setup, schematic, and layout of the evaluation module (EVM) for the
TPS61129-Q1. The EVM helps to evaluate the behavior and performance of the device at different input voltages, output voltages, and load conditions.

This EVM is designed for 0.9V to 5.5V input voltage and 5V output voltage applications. The SYNC/MODE jumper (J4) controls the operating mode of the device. At light load, the device has two operating modes that can be selected through the SYNC/MODE pin. When SYNC/MODE is connected to Low, the device works in pulse frequency modulation (auto PFM) mode to improve light-load efficiency. When SYNC/MODE is connected to High, the device works in forced PWM mode to avoid audible noise and to improve light-load ripple performance. The SYNC/MODE pin can also be used to synchronize the device switching frequency with an external clock signal from 1.5MHz to 3.3MHz. This EVM has test points of TP1, TP2, and TP3 for SW voltage, loop voltage, and power-good indicator voltage measurement, respectively. The peak inductor current limit is typically 3.5A. The feedback divider and compensation network can be modified for other application conditions as per the datasheet. For fixed 5V output operation, the FB pin can be connected directly to VOUT.

The TPS61129-Q1 features an additional spread spectrum function through the SSEN jumper (J5), and uses a triangle waveform to spread the switching frequency with ±6% of normal frequency. These features mean that with the normal 2.2MHz switching frequency, the spread spectrum function modulates the switching frequency in the range of 2.07MHz to 2.33MHz in a triangle profile with a 9kHz rate. When SSEN is high, the spread spectrum function is enabled. When SSEN is low, the spread spectrum function is disabled.