TPS51123

ACTIVE

Dual-Synch Step-Down Controller w/Out-of-Audio Operation 100mA LDO f/Notebook Sys Pwr

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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 Switching frequency (Min) (kHz) 200 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)
  • 24-Pin QFN (RGE) Package
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Description

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 responses 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 TPS51123 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 Out-of-Audio™ Operation and 100-mA datasheet (Rev. E) Feb. 15, 2013
Application notes Intel Core i3, i5, i7 [Arrandale] Reference Design Jul. 21, 2010
More literature 2010 Intel™ Atom Power System EVM and Support Tools [WMV] Jul. 20, 2010
Technical articles Embedded Computers with TI Power in a myriad of applications May 15, 2010
User guides Using the TPS51123 Dec. 12, 2008

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SIMULATION MODELS Download
SLUM279A.ZIP (52 KB) - PSpice Model

CAD/CAE symbols

Package Pins Download
VQFN (RGE) 24 View options

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