LM25574_0703 NSC [National Semiconductor], LM25574_0703 Datasheet

LM25574_0703

Manufacturer Part Number

LM25574_0703

Description

Manufacturer

NSC [National Semiconductor]

Datasheet

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LM25574

SIMPLE SWITCHER® 42V, 0.5A Step-Down Switching

Regulator

General Description

The LM25574 is an easy to use SIMPLE SWITCHER® buck

regulator which allows design engineers to design and opti-

mize a robust power supply using a minimum set of compo-

nents. Operating with an input voltage range of 6 - 42V, the

LM25574 delivers 0.5A of continuous output current with an

integrated 750mΩ N-Channel MOSFET. The regulator uti-

lizes an Emulated Current Mode architecture which provides

inherent line regulation, tight load transient response, and

ease of loop compensation without the usual limitation of low-

duty cycles associated with current mode regulators. The

operating frequency is adjustable from 50kHz to 1MHz to al-

low optimization of size and efficiency. To reduce EMI, a

frequency synchronization pin allows multiple IC’s from the

LM(2)557x family to self-synchronize or to synchronize to an

external clock. The LM25574 guarantees robustness with cy-

cle-by-cycle current limit, short-circuit protection, thermal

shut-down, and remote shut-down. The device is available in

a TSSOP-16 package. The LM25574 is supported by the full

suite of WEBENCH

Simplified Application Schematic

WEBENCH

is a registered trademark of National Semiconductor Corporation.

On-Line design tools.

202141

Features

■

Package

■

Integrated 42V, 750mΩ N-channel MOSFET

Ultra-wide input voltage range from 6V to 42V

Adjustable output voltage as low as 1.225V

1.5% feedback reference accuracy

Operating frequency adjustable between 50kHz and

1MHz with single resistor

Master or slave frequency synchronization

Adjustable soft-start

Emulated current mode control architecture

Wide bandwidth error amplifier

Built-in protection

TSSOP-16

20214101

www.national.com

March 2007

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