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TPS51125A Datasheet Step-Down Controller

Manufacturer: Texas Instruments

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General Description

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 main converter’s efficiency.

Overview

TPS51125A www.ti.com SLUS976F – SEPTEMBER 2009 – REVISED SEPTEMBER 2012 Dual-Synchronous, Step-Down Controller with Out-of-Audio™ Operation and 100-mA LDOs for Notebook System Power Check for Samples:.

Key Features

  • 1.
  • 2 Wide Input Voltage Range: 5.5 V to 28 V.
  • Output Voltage Range: 2 V to 5.5 V.
  • Built-in 100-mA 5-V/3.3-V LDO with Switches.
  • Built-in 1% 2-V Reference Output.
  • With/Without Out-of-Audio™ Mode Selectable Light Load and PWM only Operation.
  • Internal 1.6-ms Voltage Servo Softstart.
  • Adaptive On-Time Control Architecture with Four Selectable Frequency Setting.
  • 4500 ppm/°C RDS(on) Current Sensing.
  • Built-In Output Discharge.

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