HG

BOOT

LG

SGND

FB

SD

PWGD

FREQ

SS/TRACK

EAO

PGND

D1

Q1

L1

+

LM2744

External

Reference

0.5 to 1.5V

LM2744

www.ti.com

SNVS292F – SEPTEMBER 2004 – REVISED MARCH 2013

LM2744 Low Voltage N-Channel MOSFET Synchronous Buck Regulator Controller with

External Reference

Check for Samples: LM2744

1

FEATURES

DESCRIPTION

The LM2744 is a high-speed synchronous buck

2

•

Power Stage Input Voltage from 1V to 16V

regulator controller with an externally adjustable

•

Control stage Input Voltage from 3V to 6V

reference voltage (between 0.5V to 1.5V). It can

•

Output Voltage Adjustable Down to 0.5V

provide simple down conversion to output voltages as

low as 0.5V. Though the control sections of the IC

•

Power Good Flag and Shutdown

are rated for 3 to 6V, the driver sections are designed

•

Output Overvoltage and Undervoltage

to accept input supply rails as high as 16V. The use

Detection

of adaptive non-overlapping MOSFET gate drivers

•

External Reference Voltage 0.5V to 1.5V

helps avoid potential shoot-through problems while

maintaining high efficiency. The IC is designed for the

•

Low-side Adjustable Current Sensing

more cost-effective option of driving only N-channel

•

Adjustable Soft-Start

MOSFETs

in

both

the

high-side

and

low-side

•

Tracking and Sequencing with Shutdown and

positions. It senses the low-side switch voltage drop

Soft Start Pins

for providing a simple, adjustable current limit.

•

Switching Frequency from 50 kHz to 1 MHz

The

fixed-frequency

voltage-mode

PWM

control

•

14-Pin TSSOP Package

architecture is adjustable from 50 kHz to 1 MHz with

one external resistor. This wide range of switching

frequency gives the power supply designer the

APPLICATIONS

flexibility

to

make

better

tradeoffs

between

•

3.3V Buck Regulation

component size, cost and efficiency.

•

Cable Modem, DSL and ADSL

Features include soft-start, input undervoltage lockout

•

Laser Jet and Ink Jet Printers

(UVLO)

and

Power

Good

(based

on

both

undervoltage and overvoltage detection). In addition,

•

Low Voltage Power Modules

the shutdown pin of the IC can be used for providing

•

DSP, ASIC, Core and I/O

startup delay, and the soft-start pin can be used for

•

DDR Memory Termination Supply

implementing precise tracking, for the purpose of

sequencing with respect to an external rail.

TYPICAL APPLICATION

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

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2013, 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.