A newer version of this product is available

open-in-new Compare products
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.

Product details

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, Synchronous Rectification Operating temperature range (C) -40 to 85 Regulated outputs (#) 2 Number of phases 1 Rating Catalog
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, Synchronous Rectification Operating temperature range (C) -40 to 85 Regulated outputs (#) 2 Number of phases 1 Rating Catalog
VQFN (RGE) 24 16 mm² 4 x 4
  • 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
  • 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

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.

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.

Download

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 4
Type Title Date
* Data sheet Dual-Synchronous, Step-Down Controller with Out-of-Audio™ Operation and 100-mA datasheet (Rev. E) 15 Feb 2013
User guide TPS51123 Buck Controller Evaluation Module User's Guide (Rev. A) PDF | HTML 31 Jan 2022
Application note Intel Core i3, i5, i7 [Arrandale] Reference Design 21 Jul 2010
Technical article Embedded Computers with TI Power in a myriad of applications 15 May 2010

Design & development

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

Simulation model

TPS51123 Unencrypted PSpice Transient Model Package (Rev. A) TPS51123 Unencrypted PSpice Transient Model Package (Rev. A)

Simulation tool

PSPICE-FOR-TI PSpice® for TI design and simulation tool

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 (...)
Package Pins Download
VQFN (RGE) 24 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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