LM2734YMKX National Semiconductor, LM2734YMKX Datasheet

LM2734YMKX

Manufacturer Part Number

LM2734YMKX

Description

IC,SMPS CONTROLLER,CURRENT-MODE,BICMOS,TSOP,6PIN,PLASTIC

Manufacturer

National Semiconductor

Datasheets

1.LM2734XMK.pdf (24 pages)

2.LM2734YMKX.pdf (22 pages)

3.LM2734YMK.pdf (22 pages)

Specifications of LM2734YMKX

Rohs Compliant

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Download datasheet (464Kb)

LM2734

Thin SOT23 1A Load Step-Down DC-DC Regulator

General Description

The LM2734 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 regula-

tion in the smallest possible PCB area.

With a minimum of external components and online design

support through WEBENCH® ™ , the LM2734 is easy to use.

The ability to drive 1A loads with an internal 300mΩ NMOS

switch using state-of-the-art 0.5µm BiCMOS technology re-

sults in the best power density available. The world class

control circuitry allows for on-times as low as 13ns, thus sup-

porting exceptionally high frequency conversion over the en-

tire 3V to 20V input operating range down to the minimum

output voltage of 0.8V. Switching frequency is internally set

to 550kHz (LM2734Y) or 1.6MHz (LM2734X), allowing the

use of extremely small surface mount inductors and chip ca-

pacitors. 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 LM2734 utilizes current-mode control and inter-

nal 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

WEBENCH™ is a trademark of Transim.

201023

20102301

Features

■

Applications

■

Thin SOT23-6 package

3.0V to 20V input voltage range

0.8V to 18V output voltage range

1A output current

550kHz (LM2734Y) and 1.6MHz (LM2734X)

switching frequencies

300mΩ NMOS switch

30nA shutdown current

0.8V, 2% internal voltage reference

Internal soft-start

Current-Mode, PWM operation

WEBENCH® online design tool

Thermal shutdown

Local Point of Load Regulation

Core Power in HDDs

Set-Top Boxes

Battery Powered Devices

USB Powered Devices

DSL Modems

Notebook Computers

Efficiency vs Load Current

= 5V, V

OUT

= 3.3V

November 8, 2007

20102345

www.national.com

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