TPS51125A

ACTIVE

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

Top

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 Regulated outputs (#) 2 Number of Phases 1 Switching frequency (Min) (kHz) 300 Switching frequency (Max) (kHz) 460 Iq (Typ) (mA) 0.55 Features Enable, Light Load Efficiency, Power Good, Synchronous Rectification Duty cycle (Max) (%) 93 Operating temperature range (C) -40 to 85 Type Controller Rating Catalog Control mode D-CAP 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)
open-in-new Find other Buck controllers (external switch)

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.

open-in-new Find other Buck controllers (external switch)
Download

Technical documentation

= Featured
No results found. Please clear your search and try again. View all 3
Type Title Date
* Datasheet Dual-Synchronous, Step-Down Controller With OOA Operation and 100-mA LDOs datasheet (Rev. F) Sep. 10, 2012
More literature 2010 Intel™ Atom Power System EVM and Support Tools [WMV] Jul. 20, 2010
User guides Using the TPS51125A Jan. 20, 2010

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
SLIM134B.ZIP (52 KB) - PSpice Model
SIMULATION MODELS Download
SLIM147B.ZIP (73 KB) - PSpice Model

CAD/CAE symbols

Package Pins Download
VQFN (RGE) 24 View options

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos

Engineer It: Leverage TI’s online toolbox to tackle EMI before touching a soldering iron

Everything you ever wanted to know about EMI: A comprehensive training on addressing potential pitfalls with DC/DC switching regulator EMI

Posted: 23-Jan-2018
Duration: 24:13

Related videos