EN

BOOST

SW

FB

GND

C3

L1

C1

C2

R1

R2

D1

D2

ON

OFF

LM2736

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SNVS316E – SEPTEMBER 2004 – REVISED SEPTEMBER 2011

LM2736 Thin SOT23 750mA Load Step-Down DC-DC Regulator

Check for Samples: LM2736

1

FEATURES

•

WEBENCH®™ online design tool

•

Thermal shutdown

23

•

Thin SOT23-6 package

•

3.0V to 18V input voltage range

APPLICATIONS

•

1.25V to 16V output voltage range

•

Local Point of Load Regulation

•

750mA output current

•

Core Power in HDDs

•

550kHz (LM2736Y) and 1.6MHz (LM2736X)

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Set-Top Boxes

–

switching frequencies

•

Battery Powered Devices

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350m

Ω NMOS switch

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USB Powered Devices

•

30nA shutdown current

•

DSL Modems

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1.25V, 2% internal voltage reference

•

Notebook Computers

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Internal soft-start

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Current-Mode, PWM operation

DESCRIPTION

The LM2736 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 6-pin Thin SOT23

package. It provides all the active functions to provide local DC/DC conversion with fast transient response and

accurate regulation in the smallest possible PCB area.

With a minimum of external components and online design support through WEBENCH®™, the LM2736 is easy

to use. The ability to drive 750mA loads with an internal 350m

Ω NMOS switch using state-of-the-art 0.5µm

BiCMOS technology results in the best power density available. The world class control circuitry allows for on-

times as low as 13ns, thus supporting exceptionally high frequency conversion over the entire 3V to 18V input

operating range down to the minimum output voltage of 1.25V. Switching frequency is internally set to 550kHz

(LM2736Y) or 1.6MHz (LM2736X), allowing the use of extremely small surface mount inductors and chip

capacitors. Even though the operating frequencies are very high, efficiencies up to 90% are easy to achieve.

External shutdown is included, featuring an ultra-low stand-by current of 30nA. The LM2736 utilizes current-mode

control and internal compensation to provide high-performance regulation over a wide range of operating

conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current

limit, thermal shutdown, and output over-voltage protection.

Typical Application Circuit

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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

WEBENCH® is a trademark of Texas Instruments, Inc..

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2011, 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.