TPS51275, TPS51275B, TPS51275C

www.ti.com

SLUSB45B – JUNE 2012 – REVISED MARCH 2013

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

1

FEATURES

APPLICATIONS

2

•

Input Voltage Range: 5 V to 24 V

•

Notebook Computers

•

Output Voltages: 5 V and 3.3 V (Adjustable

•

Tablet Computers

Range ±10%)

DESCRIPTION

•

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

The TPS51275, TPS51275B and TPS51275C are

•

Clock Output for Charge-Pump

cost-effective,

dual-synchronous

buck

controllers

•

±1% Reference Accuracy

targeted for notebook system-power supply solutions.

•

Adaptive On-Time D-CAP™ Mode Control

It provides 5-V and 3.3-V LDOs and requires few

external components. The 260-kHz VCLK output can

Architecture with 300-kHz and 355-kHz

be used to drive an external charge pump, generating

Frequency Setting

gate drive voltage for the load switches without

•

Auto-skip Light Load Operation (TPS51275,

reducing

the

main

converter

efficiency.

The

and TPS51275C)

TPS51275, TPS51275B and TPS51275C supports

•

OOA Light Load Operation (TPS51275B)

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

•

Built-In Output Discharge Function

voltage ranging from 5 V to 24 V and supports output

voltages of 5.0 V and 3.3 V. The TPS51275,

•

Separate Enable Input for Switchers

TPS51275B and TPS51275C are available in a 20-

•

Dedicated OC Setting Terminals

pin, 3 mm x 3 mm, QFN package and is specified

•

Power Good Indicator

from –40°C to 85°C.

•

OVP, UVP and OCP Protection

•

Non-Latch UVLO and OTP Protection

•

20-Pin, 3 mm x 3 mm, QFN (RUK)

NEED SOME SPACE

ORDERABLE

ENABLE

OUTPUT

SKIP MODE

ALWAYS On-LDO

PACKAGE

QUANTITY

SUPPLY

DEVICE NUMBER

FUNCTION

TPS51275RUKR

Tape and Reel

3000

Auto-skip

VREG3

TPS51275RUKT

Mini reel

250

TPS51275BRUKR

Tape and Reel

3000

PLASTIC Quad

EN1 and EN2

OOA

Flat Pack

TPS51275BRUKT

Mini reel

250

VREG3 and VREG5

TPS51275CRUKR

Tape and Reel

3000

Auto-skip

TPS51275CRUKT

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 is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012–2013, 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.