LM2574, LM2574HV

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SNVS104C – JUNE 1999 – REVISED APRIL 2013

LM2574/LM2574HV SIMPLE SWITCHER™ 0.5A Step-Down Voltage Regulator

Check for Samples: LM2574, LM2574HV

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FEATURES

DESCRIPTION

The LM2574 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 0.5A load with excellent line and load

1.23V to 37V (57V for HV version) ±4% Max

regulation. These devices are available in fixed output

Over Line and Load Conditions

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

output version.

•

Specified 0.5A Output Current

•

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

Requiring

a

minimum

number

of

external

HV Version

components, these regulators are simple to use and

include internal frequency compensation and a fixed-

•

Requires Only 4 External Components

frequency oscillator.

•

52 kHz Fixed Frequency Internal Oscillator

The

LM2574

series

offers

a

high-efficiency

•

TTL Shutdown Capability, Low Power Standby

replacement

for

popular

three-terminal

linear

Mode

regulators. Because of its high efficiency, the copper

•

High Efficiency

traces on the printed circuit board are normally the

only heat sinking needed.

•

Uses Readily Available Standard Inductors

•

Thermal Shutdown and Current Limit

A standard series of inductors optimized for use with

Protection

the LM2574 are available from several different

manufacturers. This feature greatly simplifies the

design of switch-mode power supplies.

APPLICATIONS

Other features include a specified ±4% tolerance on

•

Simple High-Efficiency Step-Down (Buck)

output voltage within specified input voltages and

Regulator

output load conditions, and ±10% on the oscillator

•

Efficient Pre-Regulator for Linear Regulators

frequency. External shutdown is included, featuring

•

On-Card Switching Regulators

50

μA (typical) standby current. The output switch

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

•

Positive to Negative Converter (Buck-Boost)

thermal shutdown for full protection under fault

conditions.

Typical Application (Fixed Output Voltage Versions)

Note: Pin numbers are for 8-pin PDIP package.

Figure 1.

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

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SIMPLE SWITCHER is a 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.