LM25576QMH

更新时间： 2024-10-27 13:09:19

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器开关
页数	文件大小	规格书
24页	433K
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LM25576QMH 数据手册

March 2007

LM25576

SIMPLE SWITCHER® 42V, 3A Step-Down Switching

Regulator

General Description

Features

The LM25576 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

LM25576 delivers 3A of continuous output current with an in-

tegrated 170mΩ N-Channel MOSFET. The regulator utilizes

an Emulated Current Mode architecture which provides in-

herent 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 operat-

ing frequency is adjustable from 50kHz to 1MHz to allow

optimization of size and efficiency. To reduce EMI, a frequen-

cy synchronization pin allows multiple IC’s from the

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

external clock. The LM25576 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 power enhanced TSSOP-20 package featuring an exposed

die attach pad for thermal dissipation. The LM25576 is sup-

ported by the full suite of WEBENCH^®On-Line design tools.

Integrated 42V, 170mΩ 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

Package

TSSOP-20EP (Exposed Pad)

■

Simplified Application Schematic

20208701

WEBENCH^®is a registered trademark of National Semiconductor Corporation.

202087

www.national.com

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