LM2738

EN

BOOST

SW

FB

GND

C3

L1

C1

C2

R1

R2

D1

D2

ON

OFF

LM2738

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SNVS556B – APRIL 2008 – REVISED APRIL 2013

LM2738 550kHz/1.6MHz 1.5A Step-Down DC-DC Switching Regulator

Check for Samples: LM2738

1

FEATURES

DESCRIPTION

The LM2738 regulator is a monolithic, high frequency,

2

•

Space Saving WSON and MSOP-PowerPAD

PWM step-down DC/DC converter in an 8-pin WSON

Package

or 8-pin MSOP-PowerPAD package. It provides all

•

3.0V to 20V Input Voltage Range

the active functions for local DC/DC conversion with

•

0.8V to 18V Output Voltage Range

fast transient response and accurate regulation in the

smallest possible PCB area.

•

1.5A Output Current

With a minimum of external components, the LM2738

•

550kHz (LM2738Y) and 1.6MHz (LM2738X)

is easy to use. The ability to drive 1.5A loads with an

–

Switching Frequencies

internal 250m

Ω NMOS switch using state-of-the-art

•

250m

Ω NMOS Switch

0.5µm BiCMOS technology results in the best power

•

400nA Shutdown Current

density available. Switching frequency is internally set

to

550kHz

(LM2738Y)

or

1.6MHz

(LM2738X),

•

0.8V, 2% Internal Voltage Reference

allowing the use of extremely small surface mount

•

Internal Soft-Start

inductors and chip capacitors. Even though the

•

Current-Mode, PWM Operation

operating frequencies are very high, efficiencies up to

90% are easy to achieve. External enable is included,

•

Thermal Shutdown

featuring an ultra-low stand-by current of 400nA. The

LM2738 utilizes current-mode control and internal

APPLICATIONS

compensation to provide high-performance regulation

•

Local Point of Load Regulation

over a wide range of operating conditions. Additional

features include internal soft-start circuitry to reduce

•

Core Power in HDDs

in-rush current, cycle-by-cycle current limit, thermal

•

Set-Top Boxes

shutdown, and output over-voltage protection.

•

Battery Powered Devices

•

USB Powered Devices

•

DSL Modems

TYPICAL APPLICATION CIRCUIT

Efficiency vs Load Current

1

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

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2013, 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.