lm5576q0 National Semiconductor Corporation, lm5576q0 Datasheet

lm5576q0

Manufacturer Part Number

lm5576q0

Description

Simple Switcher 75v, 3a Step-down Switching Regulator

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM5576Q0.pdf (22 pages)

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LM5576Q0

SIMPLE SWITCHER® 75V, 3A Step-Down Switching

Regulator

General Description

The LM5576Q0 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 - 75V, the

LM5576Q0 delivers 3A of continuous output current with an

integrated 170mΩ 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 500kHz to

allow 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 LM5576Q0 guarantees robustness with

cycle-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 LM5576Q0 is sup-

ported by the full suite of WEBENCH

Simplified Application Schematic

WEBENCH

is a registered trademark of National Semiconductor Corporation.

On-Line design tools.

300709

Features

■

Package

■

Applications

■

LM5576Q0 is an Automotive Grade product that is AEC-

Q100 grade 0 qualified

-40°C to 150°C operating junction temperature

Integrated 75V, 170mΩ N-channel MOSFET

Ultra-wide input voltage range from 6V to 75V

Adjustable output voltage as low as 1.225V

1.65% feedback reference accuracy

Operating frequency adjustable between 50kHz and

500kHz with single resistor

Master or slave frequency synchronization

Adjustable soft-start

Emulated current mode control architecture

Wide bandwidth error amplifier

Built-in protection

TSSOP-20EP (Exposed Pad)

Automotive

Industrial

30070901

October 16, 2008

www.national.com

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