BST

SW

COMP

FB

SS

RAMP

RT

VCC

VIN

OUT

IS

GND

LM5574

VIN

VOUT

SYNC

SD

LM5574, LM5574-Q1

www.ti.com

SNVS478F – JANUARY 2007 – REVISED APRIL 2013

LM5574/LM5574-Q1 SIMPLE SWITCHER® 75V, 0.5A Step-Down Switching Regulator

Check for Samples: LM5574, LM5574-Q1

1

FEATURES

DESCRIPTION

The LM5574 is an easy to use SIMPLE SWITCHER®

23

•

LM5574-Q1 is an Automotive Grade Product

buck regulator which allows design engineers to

that is AEC-Q100 Grade 1 Qualified (

−40°C to +

design and optimize a robust power supply using a

125°C Operating Junction Temperature)

minimum set of components. Operating with an input

•

Integrated 75V, 750m

Ω N-channel MOSFET

voltage range of 6 - 75V, the LM5574 delivers 0.5A of

continuous output current with an integrated 750m

Ω

•

Ultra-Wide Input Voltage Range from 6V to 75V

N-Channel

MOSFET.

The

regulator

utilizes

an

•

Adjustable Output Voltage as Low as 1.225V

Emulated Current Mode architecture which provides

•

1.5% Feedback Reference Accuracy

inherent line regulation, tight load transient response,

•

Operating Frequency Adjustable Between

and ease of loop compensation without the usual

limitation of low-duty cycles associated with current

50kHz and 500kHz with Single Resistor

mode

regulators.

The

operating

frequency

is

•

Master or Slave Frequency Synchronization

adjustable

from

50kHz

to

500kHz

to

allow

•

Adjustable Soft-Start

optimization of size and efficiency. To reduce EMI, a

•

Emulated Current Mode Control Architecture

frequency synchronization pin allows multiple IC’s

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

•

Wide Bandwidth Error Amplifier

synchronize to an external clock. The LM5574

•

Built-in Protection

ensures robustness with cycle-by-cycle current limit,

•

Automotive Grade Product Datasheet that is

short-circuit

protection,

thermal

shut-down,

and

remote shut-down. The device is available in a

AEC-Q100 Grade 0 Qualified is Available Upon

TSSOP-16 package. The LM5574 is supported by the

Request

–

(

−40°C to + 150°C Operating Junction

Temperature)

PACKAGE

•

TSSOP-16

APPLICATIONS

•

Automotive

•

Industrial

Simplified Application Schematic

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

WEBENCH is a registered trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.