TPS51125

ACTIVE

4.5-V to 28-V, dual-channel synchronous buck controller with 100-mA LDOs and Out-of-Audio™

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Same functionality with different pin-out to the compared device.
TPS51275B ACTIVE 5.5-V to 24-V, dual-synchronous buck controller with Out-of-Audio™ mode This upgraded product offers a smaller 3x3mm QFN package and fewer external components.
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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) (uA) 550 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 460 Features Enable, Light Load Efficiency, Power Good 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 and 3.3-V LDO With Switches
  • Built-In 1% 2-V Reference Output
  • With or Without Out-of-Audio™ Mode Selectable
    Light-Load and PWM-Only Operation
  • Internal 1.6-ms Voltage Servo Soft-Start
  • Adaptive On-Time Control Architecture With Four
    Selectable Frequency Setting
  • 4500 ppm/\xC2°C RDS(on) Current Sensing
  • Built-In Output Discharge
  • Powergood Output
  • Built-In OVP/UVP/OCP
  • Thermal Shutdown (Nonlatch)
  • QFN, 24-Pin (RGE)
  • APPLICATIONS
    • Notebook Computers
    • I/O Supplies
    • System Power Supplies

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Description

The TPS51125 is a cost-effective, dual-synchronous buck controller targeted for notebook system power supply solutions. The device 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, thus generating gate drive voltage for the load switches without reducing the efficiency of the main converter. The TPS51125 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 TPS51125 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
* Data sheet TPS51125 Dual-Synchronous, Step-Down Controller With Out-of-Audio™ Operation and 100-mA LDOS for Notebook System Power datasheet (Rev. H) Jan. 05, 2015
User guide Using the TPS51125 (Rev. A) Jul. 12, 2012
Application note Intel Core i3, i5, i7 [Arrandale] Reference Design Jul. 21, 2010
Technical article Embedded Computers with TI Power in a myriad of applications May 15, 2010

Design & development

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Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description
The TPS51125 is a cost effective, dual-synchronous buck controller targeted for notebook system power supply solutions. It provides 5V and 3.3V LDOs and requires few external components. The 270kHz VCLK output can be used to drive an external charge pump, generating gate drive voltage for the load (...)

Design tools & simulation

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PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
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Package Pins Download
VQFN (RGE) 24 View options

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