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 Iout (max) (A) 10 Operating temperature range (°C) -40 to 85 Control mode D-CAP Rating Catalog Vout (min) (V) 4.5 Vout (max) (V) 5.5 Features Enable, Light Load Efficiency, Power good, Synchronous Rectification Iq (typ) (µA) 900 Duty cycle (max) (%) 90 Number of phases 1
Vin (min) (V) 5.5 Vin (max) (V) 24 Iout (max) (A) 10 Operating temperature range (°C) -40 to 85 Control mode D-CAP Rating Catalog Vout (min) (V) 4.5 Vout (max) (V) 5.5 Features Enable, Light Load Efficiency, Power good, Synchronous Rectification Iq (typ) (µA) 900 Duty cycle (max) (%) 90 Number of phases 1
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
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
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
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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
Package Pins Download
WQFN (RUK) 20 View options

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