SLUU340A February   2009  – January 2022 TPS51123


  1. 1Introduction
    1.     Trademarks
  2. 2Performance Specification Summary
  3. 3Schematic
  4. 4Test Setup and Results
    1. 4.1 Test Setup
    2. 4.2 Test Procedure
    3. 4.3 Start-Up Performance
    4. 4.4 Transient Performance
  5. 5Configuration
    1. 5.1 Switching Frequency Selection
    2. 5.2 Operation Mode Selection
  6. 6Physical Layouts
  7. 7List of Materials
  8. 8References
  9. 9Revision History


The TPS51123 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 TPS51123 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 device 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 TPS51123EVM evaluation module is a high-efficiency, dual synchronous buck converter providing 5 V at 8 A and 3.3 V at 8 A from a 8-V to 25-V input.