TPS51125A

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Dual-Synchronous, Step-Down Controller with Out-of-Audio Operation and 100-mA LDOs

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Product details

Parameters

Vin (Min) (V) 5.5 Vin (Max) (V) 28 Vout (Min) (V) 2 Vout (Max) (V) 5.5 Iout (Max) (A) 20 Iq (Typ) (mA) 0.55 Iq (Typ) (uA) 550 Switching frequency (Min) (kHz) 300 Switching frequency (Max) (kHz) 460 Features Enable, Light Load Efficiency, Power Good, Synchronous Rectification Operating temperature range (C) -40 to 85 Regulated outputs (#) 2 Number of Phases 1 Rating Catalog open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

VQFN (RGE) 24 16 mm² 4 x 4 open-in-new Find other Buck controllers (external switch)

Features

  • 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
  • Power Good Output
  • Built-in OVP/UVP/OCP
  • Thermal Shutdown (Non-latch)
  • QFN24 (RGE)
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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. 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 TPS51125A is available in a 24-pin QFN package and is specified from -40°C to 85°C ambient temperature range.

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Technical documentation

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Type Title Date
* Datasheet Dual-Synchronous, Step-Down Controller With OOA Operation and 100-mA LDOs datasheet (Rev. F) Sep. 10, 2012
User guides Using the TPS51125A Jan. 20, 2010

Design & development

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VQFN (RGE) 24 View options

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