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POWER MANAGEMENT

Description

The LM2575/6 series switching regulators are monolithic

integrated circuits designed for use in 聯(lián)buck聰 or 聯(lián)buck/

boost聰 regulator applications requiring accurate output

voltages over combined variations of line, load and

temperature. This unique series greatly simplifies

switching power supply design. The LM2575 has a

maximum output current of 1A and the LM2576 is rated

for 3A.

1A & 3A Miniconverter

Switching Regulators

Features

u

Pin for pin replacement for National聮s LM2575/6

u

series

DC-to-DC buck or buck/boost converter requiring

only 4 support components

Fixed or adjustable voltages

Preset output voltages of 3.3V, 5V and 12V

Wide output voltage range, 1.23V to 35V

82% typical efficiency @ 5V out

Wide input voltage range, 4V to 40V

Inhibit/enable control pin

Industrial temperature range

TO-220 and TO-263 packages

LM2575 & LM2576

u

u

u

u

The LM2575/6 series miniconverters include a

u

switching regulator and compensation network all within

u

the same package. Just add a choke, catch diode and

u

two capacitors to obtain an efficient DC-to-DC converter.

u

The current limit and thermal shutdown features of the

LM2575/6 series fully protect the device against

overstress conditions.

Applications

u

u

u

u

Micro controller power supplies

Medical equipment

Industrial power supplies

Instrumentation power supplies

The LM2575/6 series offers an alternative to popular 3

terminal linear regulators by providing higher efficiency

with reduced heatsink size. In many applications a heat

sink will not be required.

Typical Application Circuits

LM2575

L

1

D

1

C

IN

C

OUT

330碌H

3A

68碌F

330碌F

LM2576

100碌H

7A

120碌F

1,000碌F

Revision 1, January 2001

1

www.semtech.com

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