LM1575, LM2575-N, LM2575HV

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SNVS106E – MAY 1999 – REVISED APRIL 2013

Check for Samples: LM1575, LM2575-N, LM2575HV

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FEATURES

DESCRIPTION

The LM2575 series of regulators are monolithic

23

•

3.3V, 5V, 12V, 15V, and Adjustable Output

integrated circuits that provide all the active functions

Versions

for a step-down (buck) switching regulator, capable of

•

Adjustable Version Output Voltage Range,

driving a 1A load with excellent line and load

–

1.23V to 37V (57V for HV Version) ±4%

regulation. These devices are available in fixed output

voltages of 3.3V, 5V, 12V, 15V, and an adjustable

Max Over

output version.

–

Line and Load Conditions

Requiring

a

minimum

number

of

external

•

Specified 1A Output Current

components, these regulators are simple to use and

•

Wide Input Voltage Range, 40V up to 60V for

include internal frequency compensation and a fixed-

HV Version

frequency oscillator.

•

Requires Only 4 External Components

The

LM2575

series

offers

a

high-efficiency

•

52 kHz Fixed Frequency Internal Oscillator

replacement

for

popular

three-terminal

linear

•

TTL Shutdown Capability, Low Power Standby

regulators. It substantially reduces the size of the

Mode

heat sink, and in many cases no heat sink is

required.

•

High Efficiency

A standard series of inductors optimized for use with

•

Uses Readily Available Standard Inductors

the LM2575 are available from several different

•

Thermal Shutdown and Current Limit

manufacturers. This feature greatly simplifies the

Protection

design of switch-mode power supplies.

•

Other features include a specified ±4% tolerance on

output voltage within specified input voltages and

APPLICATIONS

output load conditions, and ±10% on the oscillator

•

Simple High-Efficiency Step-Down (Buck)

frequency. External shutdown is included, featuring

Regulator

50

μA (typical) standby current. The output switch

includes cycle-by-cycle current limiting, as well as

•

Efficient Pre-Regulator for Linear Regulators

thermal shutdown for full protection under fault

•

On-Card Switching Regulators

conditions.

•

Positive to Negative Converter (Buck-Boost)

Typical Application

(Fixed Output Voltage Versions)

Pin numbers are for the TO-220 package.

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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

SIMPLE SWITCHER 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 © 1999–2013, 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.