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Part Number: LM1578A
Description: The LM1578A is a switching regulator which can easily be set up for such DC-to-DC voltage conversion circuits as the bu...
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LM1578A
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General Description
LM1578A General Description
The LM1578A 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 LM1578A 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 LM1578A has an on board oscillator, which sets the switching frequency with a single external capacitor from <1 Hz to 100 kHz (typical).
The LM1578A is an improved version of the LM1578, offering higher maximum ratings for the total supply voltage and output transistor emitter and collector voltages.
LM1578A Maximum Ratings
Total Supply Voltage 50V
Collector Output to Ground −0.3V to +50V
Emitter Output to Ground (Note 2) −1V to +50V
Power Dissipation (Note 3) Internally limited
Output Current 750 mA
Storage Temperature −65°C to +150°C
Lead Temperature
(soldering, 10 seconds) 260°C
Maximum Junction Temperature 150°C
ESD Tolerance (Note 4) 2 kV
Ambient Temperature Range
LM1578A −55°C TA +125°C
LM2578A −40°C TA +85°C
LM3578A 0°C TA +70°C
Junction Temperature Range
LM1578A −55°C TJ +150°C
LM2578A −40°C TJ +125°C
LM3578A 0°C TJ+125°C
LM1578A 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%
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%
LM1578A Typical Application
Switching regulators in buck, boost, inverting, and single-ended transformer configurations
Motor speed control
Lamp flasher
LM1578A
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- Datasheet: LM1578A
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