SLUU408A February   2010  – January 2022 TPS51125A

 

  1.   Trademarks
  2. 1Introduction
  3. 2Performance Specification Summary
  4. 3Schematic
  5. 4Test Setup and Results
    1. 4.1 Test Setup
    2. 4.2 Test Procedure
    3. 4.3 Start-Up Performance
  6. 5Configuration
    1. 5.1 Switching Frequency Selection
    2. 5.2 Operation Mode Selection
    3. 5.3 VCLK ON/OFF Selection
  7. 6Physical Layouts
  8. 7List of Materials
  9. 8References
  10. 9Revision History

1 Introduction

The TPS51125A is a cost effective, dual-synchronous buck controller targeted for notebook system power supply solutions. It provides 5-V and 3.3-V LDOs and requires few external components. The 270-kHz VCLK output can be used to drive an external charge pump, generating gate drive voltage for the load switches without reducing the efficiency of the main converter. The TPS51125A supports high-efficiency, fast transient response and provides a combined power-good signal. Out-of-Audio™ mode light-load operation enables low acoustic noise at much higher efficiency than conventional forced PWM operation. Adaptive on-time D-CAP™ control provides convenient and efficient operation. The part operates with supply input voltages ranging from 5.5 V to 28 V and supports output voltages from 2 V to 5.5 V.

The TPS51125AEVM evaluation module is a high-efficiency, dual synchronous buck converter providing 5 V at 8 A and 3.3 V at 8 A from 8-V to 25-V input.