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LM3578A Switching Regulator


source: | post time:2010-04-30

Part Number(s)
(NSID)
Top View Type Pins MSL Rating Peak Reflow RoHS
Status
CAD Symbols Models Package
Marking
Format
LM3578AM/NOPB
LM3578AM
SOIC NARROW 8 1
1
260
235
Detail N/A N/A
NSZXTT
3578
AM
LM3578AMX/NOPB
LM3578AMX
SOIC NARROW 8 1
1
260
235
Detail N/A N/A
NSZXTT
3578
AM
LM3578AN/NOPB
LM3578AN
MDIP 8 1
1
NA
NA
Detail N/A N/A
NSUZXYTTE#
LM3578AN

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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 Vin 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.

Applications

Switching regulators in buck, boost, inverting, and single-ended transformer configurations
Motor speed control
Lamp flasher

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%

Diagrams

Typical Application
*click for larger image

Temp range: LM2578A: -40 to +125C; LM3578A: 0 to 125C

 

 

 

Connection Diagram
*click for larger image



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Next:LM5005 High Voltage 2.5 Amp Buck Regulator


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