TPS51225

ACTIVE

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

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TPS51275 ACTIVE 5.5-V to 24-V, dual-synchronous buck controller with 5-V and 3.3-V LDOs This upgraded product offers a smaller QFN package and fewer external components.
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Product details

Parameters

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) (uA) 900 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 open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

WQFN (RUK) 20 9 mm² 3 x 3 open-in-new Find other Buck controllers (external switch)

Features

  • 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)
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Description

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) Sep. 09, 2012
Application note Mosfet Driver Circuit Design Guide for TPS512xx (Rev. A) Apr. 01, 2019
Application note Understanding Dead-time Based On TPS51225/275/285 Aug. 22, 2018
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
User guide TPS51225EVM-133 User's Guide May 11, 2012

Design & development

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

Hardware development

EVALUATION BOARD Download
TPS51225 Evaluation Module
TPS51225EVM-133
document-generic User guide
49
Description
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 (...)
Features
  • Input voltage: 8V-20V
  • Vout1: 5V/0A-10A, Vout2: 3.3V/0A-10A
  • D-CAP™ mode with fast transient response
  • Auto-Skip mode operation
  • OVP/UVP/OCP Protection

Design tools & simulation

SIMULATION MODEL Download
SLUM258A.ZIP (56 KB) - PSpice Model
SIMULATION MODEL Download
SLUM271.ZIP (83 KB) - PSpice Model
SIMULATION MODEL Download
SLUM272A.ZIP (56 KB) - PSpice Model
SIMULATION MODEL Download
SLUM273A.ZIP (110 KB) - PSpice Model
SIMULATION MODEL Download
SLUM350.ZIP (79 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SLUM351.TSC (304 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLUM353.TSC (837 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLUM354.ZIP (87 KB) - TINA-TI Spice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
WQFN (RUK) 20 View options

Ordering & quality

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