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TPS51225

ACTIVE

5.5-V to 24-V, dual-synchronous buck controller with 5-V and 3.3-V LDOs

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TPS51397A ACTIVE 4.5-V to 24-V input, 10-A, synchronous step-down regulator Faster switching frequency and extended positive operating temperature range.

Product details

Vin (min) (V) 5.5 Vin (max) (V) 24 Vout (min) (V) 4.5 Vout (max) (V) 5.5 Iout (max) (A) 10 Iq (typ) (mA) 0.9 Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 355 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 Control mode D-CAP Type Controller
Vin (min) (V) 5.5 Vin (max) (V) 24 Vout (min) (V) 4.5 Vout (max) (V) 5.5 Iout (max) (A) 10 Iq (typ) (mA) 0.9 Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 355 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 Control mode D-CAP Type Controller
WQFN (RUK) 20 9 mm² 3 x 3
  • Input Voltage Range: 5.5 V to 24 V
  • Output Voltages: 5 V and 3.3 V (Adjustable Range ±10%)
  • Built-in, 100-mA, 5-V and 3.3-V LDOs
  • Clock Output for Charge-Pump
  • ±1% Reference Accuracy
  • Adaptive On-time D-CAP Mode Control Architecture with 300kHz/355kHz Frequency Setting
  • Auto-skip Light Load Operation (TPS51225/C)
  • OOA Light Load Operation (TPS51225B)
  • Internal 0.8-ms Voltage Servo Soft-Start
  • Low-Side RDS(on) Current Sensing Scheme with 4500 ppm/°C Temperature Coefficient
  • Built-in Output Discharge Function
  • Separate Enable Input for Switchers (TPS51225/B/C)
  • Dedicated OC Setting Terminals
  • Power Good Indicator
  • OVP/UVP/OCP Protection
  • Non-latch UVLO/OTP Protection
  • 20-Pin, 3 mm × 3 mm, QFN (RUK)
  • Input Voltage Range: 5.5 V to 24 V
  • Output Voltages: 5 V and 3.3 V (Adjustable Range ±10%)
  • Built-in, 100-mA, 5-V and 3.3-V LDOs
  • Clock Output for Charge-Pump
  • ±1% Reference Accuracy
  • Adaptive On-time D-CAP Mode Control Architecture with 300kHz/355kHz Frequency Setting
  • Auto-skip Light Load Operation (TPS51225/C)
  • OOA Light Load Operation (TPS51225B)
  • Internal 0.8-ms Voltage Servo Soft-Start
  • Low-Side RDS(on) Current Sensing Scheme with 4500 ppm/°C Temperature Coefficient
  • Built-in Output Discharge Function
  • Separate Enable Input for Switchers (TPS51225/B/C)
  • Dedicated OC Setting Terminals
  • Power Good Indicator
  • OVP/UVP/OCP Protection
  • Non-latch UVLO/OTP Protection
  • 20-Pin, 3 mm × 3 mm, QFN (RUK)

The TPS51225/B/C 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 260-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 efficiency. The TPS51225/B/C supports high efficiency, fast transient response and provides a combined power-good signal. Adaptive on-time, D-CAP™ control provides convenient and efficient operation. The device operates with supply input voltage ranging from 5.5 V to 24 V and supports output voltages of 5.0 V and 3.3 V. The TPS51225/B/C is available in a 20-pin, 3 mm × 3 mm, QFN package and is specified from –40°C to 85°C.

The TPS51225/B/C 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 260-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 efficiency. The TPS51225/B/C supports high efficiency, fast transient response and provides a combined power-good signal. Adaptive on-time, D-CAP™ control provides convenient and efficient operation. The device operates with supply input voltage ranging from 5.5 V to 24 V and supports output voltages of 5.0 V and 3.3 V. The TPS51225/B/C is available in a 20-pin, 3 mm × 3 mm, QFN package and is specified from –40°C to 85°C.

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Technical documentation

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Type Title Date
* Data sheet Dual Synchronous Step-Down Controller with 5-V and 3.3-V LDOs datasheet (Rev. B) 09 Sep 2012
User guide TPS51225 Buck Controller Evaluation Module User's Guide (Rev. A) PDF | HTML 11 Feb 2022
Application note Mosfet Driver Circuit Design Guide for TPS512xx (Rev. A) 01 Apr 2019
Application note Understanding Dead-time Based On TPS51225/275/285 22 Aug 2018
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018

Design & development

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

Evaluation board

TPS51225EVM-133 — TPS51225 Evaluation Module

The Texas Instruments TPS51225EVM-133 evaluation module (EVM) helps designers evaluate the performance of the TPS51225 Dual Synchronous Step-Down Controller. The EVM provides 5V and 3.3V outputs and LDOs for a notebook system power supply application. The EVM also provides a 260kHz VCLK output, (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

TPS51225 TINA-TI Transient Reference Design

SLUM351.TSC (304 KB) - TINA-TI Reference Design
Simulation model

TPS51225 TINA-TI Transient Spice Model

SLUM350.ZIP (79 KB) - TINA-TI Spice Model
Simulation model

TPS51225 Unencrypted PSpice Transient Model Package (Rev. A)

SLUM258A.ZIP (56 KB) - PSpice Model
Simulation model

TPS51225A PSpice Transient Model

SLUM271.ZIP (83 KB) - PSpice Model
Simulation model

TPS51225B TINA-TI Transient Reference Design

SLUM353.TSC (837 KB) - TINA-TI Reference Design
Simulation model

TPS51225B TINA-TI Transient Spice Model

SLUM354.ZIP (87 KB) - TINA-TI Spice Model
Simulation model

TPS51225B Unencrypted PSpice Transient Model Package (Rev. A)

SLUM273A.ZIP (110 KB) - PSpice Model
Simulation model

TPS51225C Unencrypted PSpice Transient Model Package (Rev. A)

SLUM272A.ZIP (56 KB) - PSpice Model
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
WQFN (RUK) 20 View options

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