TPS51225, TPS51225B, TPS51225C

www.ti.com

SLUSAV0B – JANUARY 2012 – REVISED SEPTEMBER 2012

Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs

Check for Samples: TPS51225, TPS51225B, TPS51225C

1

FEATURES

APPLICATIONS

2

•

Input Voltage Range: 5.5 V to 24 V

•

Notebook Computers

•

Output Voltages: 5 V and 3.3 V (Adjustable

•

Netbook, Tablet Computers

Range ±10%)

DESCRIPTION

•

Built-in, 100-mA, 5-V and 3.3-V LDOs

The

TPS51225/B/C

is

a

cost-effective,

dual-

•

Clock Output for Charge-Pump

synchronous buck controller targeted for notebook

•

±1% Reference Accuracy

system-power supply solutions. It provides 5-V and

•

Adaptive On-time D-CAP™ Mode Control

3.3-V LDOs and requires few external components.

The 260-kHz VCLK output can be used to drive an

Architecture with 300kHz/355kHz Frequency

external charge pump, generating gate drive voltage

Setting

for the load switches without reducing the main

•

Auto-skip Light Load Operation (TPS51225/C)

converter efficiency. The TPS51225/B/C supports

•

OOA Light Load Operation (TPS51225B)

high efficiency, fast transient response and provides a

combined power-good signal. Adaptive on-time, D-

•

Internal 0.8-ms Voltage Servo Soft-Start

CAP™ control provides convenient and efficient

•

operation. The device operates with supply input

4500 ppm/°C Temperature Coefficient

voltage ranging from 5.5 V to 24 V and supports

•

Built-in Output Discharge Function

output

voltages

of

5.0

V

and

3.3

V.

The

TPS51225/B/C is available in a 20-pin, 3 mm × 3

•

Separate Enable Input for Switchers

mm, QFN package and is specified from –40°C to

(TPS51225/B/C)

85°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)

ORDERABLE

ENABLE

OUTPUT

SKIP MODE

ALWAYS ON-LDO

PACKAGE

QUANTITY

FUNCTION

SUPPLY

DEVICE NUMBER

TPS51225RUKR

Tape and Reel

3000

EN1/ EN2

Auto-skip

VREG3

TPS51225RUKT

Mini reel

250

PLASTIC Quad

TPS51225BRUKR

Tape and Reel

3000

Flat Pack

EN1/ EN2

OOA

VREG3

TPS51225BRUKT

Mini reel

250

(20 pin QFN)

TPS51225CRUKR

Tape and Reel

3000

EN1/ EN2

Auto-skip

VREG3 & VREG5

TPS51225CRUKT

Mini reel

250

(1)

For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI

website at www.ti.com.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

D-CAP, Out-of-Audio are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.