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NC

NC

OUTPUT

NC

GND

NC

FEEDBACK

NC

NC

NC

GND

GND

NC

NC

ON/OFF

N (PDIP) PACKAGE

(TOP VIEW)

NC − No internal connection

DESCRIPTION/ORDERING INFORMATION

LM2575

1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR

SLVS569E – JANUARY 2005 – REVISED JANUARY 2006

•

Simple High-Efficiency Step-Down (Buck)

•

Adjustable With a Range of 1.23 V to 37 V and

Regulator

±4% Regulation (Max) Over Line, Load, and

•

Pre-Regulator for Linear Regulators

Temperature Conditions

•

On-Card Switching Regulators

•

Specified 1-A Output Current

•

Positive-to-Negative Converter (Buck-Boost)

•

Wide Input Voltage Range

…4.75 V to 40 V

•

Uses Readily Available Standard Inductors

•

52-kHz (Typ) Fixed-Frequency Internal

Oscillator

•

TTL Shutdown Capability With 50-

µA (Typ)

Standby Current

•

High Efficiency

…as High as 88% (Typ)

•

Thermal Shutdown and Current-Limit

Protection With Cycle-by-Cycle Current

Limiting

•

For the Full Offering of Voltages (Including

Fixed-Output Options) and Packages

(Including TO-263), see TL2575 Datasheet

The LM2575 greatly simplifies the design of switching power supplies by conveniently providing all the active

functions needed for a step-down (buck) switching regulator in an integrated circuit. Accepting a wide input

voltage range and available in an adjustable output version, the LM2575 has an integrated switch capable of

delivering 1 A of load current, with excellent line and load regulation. The device also offers internal frequency

compensation, a fixed-frequency oscillator, cycle-by-cycle current limiting, and thermal shutdown. In addition, a

manual shutdown is available via an external ON/OFF pin.

The LM2575 represents a superior alternative to popular three-terminal linear regulators. Due to its high

efficiency, it significantly reduces the size of the heat sink and, in many cases, no heat sink is required.

Optimized for use with standard series of inductors available from several different manufacturers, the LM2575

greatly simplifies the design of switch-mode power supplies by requiring a minimal addition of only four to six

external components for operation.

The LM2575 is characterized for operation over the virtual junction temperature range of –40

°C to 125°C.

ORDERING INFORMATION

ORDERABLE PART NUMBER

TOP-SIDE MARKING

(NOM)

–40

°C to 125°C

ADJ

PDIP – N

Tube of 25

LM2575IN

LM2575IN

(1)

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

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.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2006, 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.