TPS51427RHBT datasheet(1/41 Pages) TI

No de pièce	TPS51427RHBT

Description	DUAL D-CAP??SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER RAILS

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Fabricant	TI [Texas Instruments]

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1

FEATURES

DESCRIPTION

APPLICATIONS

TPS51427

www.ti.com .............................................................................................................................................................. SLUS819A – APRIL 2008 – REVISED MAY 2008

DUAL D-CAP™ SYNCHRONOUS STEP-DOWN CONTROLLER

FOR NOTEBOOK POWER RAILS

23

• Fixed-Frequency Emulated On-Time Control;

Frequency Selectable from Three Options

The TPS51427 is a dual synchronous step-down

controller

designed

for

notebook

and

mobile

• D-CAP™ Mode Enables Fast Transient

communications applications. This device is part of a

Response Less than 100 ns

low-cost suite of notebook power bus regulators that

• Advanced Ramp Compensation Allows Low

enables system designs with low external component

Output Ripple with Minimal Jitter

counts.

The

TPS51427

includes

two

• Selectable PWM-Only/OOA™/Auto-Skip Modes

pulse-width-modulation (PWM) controllers, SMPS1

and SMPS2. The output of SMPS1 can be adjusted

• Wide Input Voltage Range: 5.5 V to 28 V

from 0.7 V to 5.9 V, while the output of SMPS2 can

• Dual Fixed or Adjustable SMPS:

be adjusted from 0.5 V to 2.5 V. This device also

–

0.7 V to 5.9 V (Channel1)

features a low-dropout (LDO) regulator that provides

a 5-V/3.3-V output, or adjustable from 0.7-V to 4.5-V

–

0.5 V to 2.5 V (Channel2)

output via LDOREFIN. The fixed-frequency emulated

• Fixed 3.3-V/5-V, or Adjustable Output 0.7-V to

adaptive on-time control supports seamless operation

4.5-V LDO; Capable of Sourcing 100 mA

between PWM mode under heavy load conditions

• Fixed 3.3-VREF Output Capable of Sourcing

and reduced frequency operation at light loads for

10 mA

high-efficiency down to the milliampere range. An

integrated boost switch enhances the high-side

• Temperature Compensated Low-Side R

DS(on)

MOSFET to further improve efficiency. The main

Current Sensing

control loop is the D-CAP™ mode that is optimized

• Adaptive Gate Drivers with Integrated Boost

for low equivalent series resistance (ESR) output

Switch

capacitors such as POSCAP or SP-CAP. Advanced

ramp compensation minimizes jitter without degrading

• Bootstrap Charge Auto Refresh

line and load regulation. RDS(on) current sensing

• Integrated Soft Start, Tracking Soft Stop

methods offers maximum cost saving.

• Independent PGOOD and EN for Each Channel

The TPS51427 supports supply input voltages that

range from 5.5 V to 28 V. It is available in the 32-pin,

5-mm

× 5-mm QFN package (Green, RoHs-

• Notebook I/O and System Bus Rails

compliant, and Pb-free). The device is specified from

• Graphics Application

–40

°C to +85°C.

• PDAs and Mobile Communication Devices

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, OOA are trademarks of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

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