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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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 regu-

lation in the smallest possible PCB area.

With a minimum of external components and online design

support through WEBENCH

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

supporting exceptionally high frequency conversion over the

entire 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

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 LM2734 utilizes current-mode control and in-

ternal compensation to provide high-performance regulation

over a wide range of operating conditions. Additional fea-

tures 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.

™

, the LM2734 is easy to use.

DS201023

20102301

Features

n Thin SOT23-6 package

n 3.0V to 20V input voltage range

n 0.8V to 18V output voltage range

n 1A output current

n 550kHz (LM2734Y) and 1.6MHz (LM2734X)

n 300mΩ NMOS switch

n 30nA shutdown current

n 0.8V, 2% internal voltage reference

n Internal soft-start

n Current-Mode, PWM operation

n WEBENCH online design tool

Applications

n Local Point of Load Regulation

n Core Power in HDDs

n Set-Top Boxes

n Battery Powered Devices

n USB Powered Devices

n DSL Modems

n Notebook Computers

switching frequencies

Efficiency vs Load Current

= 5V, V

OUT

= 3.3V

20102345

October 2004

www.national.com

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