LM2578A, LM3578A

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SNVS767E – AUGUST 2000 – REVISED APRIL 2013

LM2578A/LM3578A Switching Regulator

Check for Samples: LM2578A, LM3578A

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FEATURES

DESCRIPTION

The LM2578A is a switching regulator which can

2

•

Inverting and Non-Inverting Feedback Inputs

easily

be

set

up

for

such

DC-to-DC

voltage

•

1.0V Reference at Inputs

conversion circuits as the buck, boost, and inverting

•

Operates from Supply Voltages of 2V to 40V

configurations. The LM2578A features a unique

comparator input stage which not only has separate

•

Output Current up to 750 mA, Saturation Less

pins for both the inverting and non-inverting inputs,

than 0.9V

but also provides an internal 1.0V reference to each

•

Current Limit and Thermal Shut Down

input, thereby simplifying circuit design and p.c. board

•

Duty Cycle up to 90%

layout. The output can switch up to 750 mA and has

output pins for its collector and emitter to promote

design flexibility. An external current limit terminal

APPLICATIONS

may be referenced to either the ground or the Vin

•

Switching Regulators in Buck, Boost,

terminal, depending upon the application. In addition,

Inverting, and Single-Ended Transformer

the LM2578A has an on board oscillator, which sets

Configurations

the

switching

frequency

with

a

single

external

capacitor from <1 Hz to 100 kHz (typical).

•

Motor Speed Control

•

Lamp Flasher

The LM2578A is an improved version of the LM2578,

offering higher maximum ratings for the total supply

voltage and output transistor emitter and collector

voltages.

Connection Diagram

Figure 1. PDIP/SOIC Package

See Package Number D0008A or P0008E

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PRODUCTION DATA information is current as of publication date.

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Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.