SNVS767E – AUGUST 2000 – REVISED APRIL 2013
LM2578A/LM3578A Switching Regulator
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FEATURES
Inverting and Non-Inverting Feedback Inputs
1.0V Reference at Inputs
Operates from Supply Voltages of 2V to 40V
Output Current up to 750 mA, Saturation Less
than 0.9V
Current Limit and Thermal Shut Down
Duty Cycle up to 90%
DESCRIPTION
The LM2578A is a switching regulator which can
easily be set up for such DC-to-DC voltage
conversion circuits as the buck, boost, and inverting
configurations. The LM2578A features a unique
comparator input stage which not only has separate
pins for both the inverting and non-inverting inputs,
but also provides an internal 1.0V reference to each
input, thereby simplifying circuit design and p.c. board
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
may be referenced to either the ground or the V
in
terminal, depending upon the application. In addition,
the LM2578A has an on board oscillator, which sets
the switching frequency with a single external
capacitor from <1 Hz to 100 kHz (typical).
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.
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APPLICATIONS
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Switching Regulators in Buck, Boost,
Inverting, and Single-Ended Transformer
Configurations
Motor Speed Control
Lamp Flasher
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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.
Products conform to specifications per the terms of the Texas
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necessarily include testing of all parameters.
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