A newer version of this product is available

Similar functionality to the compared device.
TPS51397A ACTIVE 4.5-V to 24-V input, 10-A, synchronous step-down regulator Offers a lower IQ and is soft start adjustable with an extended positive operating temperature range in a smaller package.

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 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 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 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

All other trademarks are the property of their respective owners

  • 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

All other trademarks are the property of their respective owners

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.

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) PDF | HTML 05 Jan 2015
User guide TPS51125 Buck Controller Evaluation Module User's Guide (Rev. B) 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

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Evaluation board

TPS51125EVM — TPS51125 Evaluation Module

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 (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

TPS51125 Unencrypted PSpice Transient Model Package (Rev. B)

SLIM134B.ZIP (52 KB) - PSpice Model
Simulation model

TPS51125 Unencrypted PSpice Average Model Package (Rev. B)

SLIM147B.ZIP (73 KB) - PSpice Model
Simulation model

TPS51125 TINA-TI Average Spice Model

SLUM345.ZIP (4 KB) - TINA-TI Spice Model
Simulation model

TPS51125 TINA-TI Average Reference Design

SLUM346.TSC (764 KB) - TINA-TI Reference Design
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 (...)
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VQFN (RGE) 24 View options

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