LM2588 Adjustable 5A Flyback Voltage Regulator

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The LM2588 regulator is a monolithic integrated circuit specifically designed for flyback, step-up (boost), and forward converter applications. The device is available in 4 different output voltage versions: 3.3V, 5.0V, 12V, and adjustable. Requiring a minimum number of external components, this regulator is cost-effective, and simple to use. Included in the datasheet are typical circuits of boost and flyback regulators. Also listed are selector guides for diodes and capacitors and a family of standard inductors and flyback transformers designed to work with these switching regulators.

The power switch is a 5.0A NPN device that can stand off 65V. Protecting the power switch are current and thermal limiting circuits and an under-voltage lockout circuit. This IC contains an adjustable frequency oscillator that can be programmed up to 200 kHz. The oscillator can also be synchronized with other devices so that multiple devices can operate at the same switching frequency.

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LM2588 Pinout

LM2588 Pin Configuration

Pin No	Pin Name	Description
1	FREQ: ADJ.-ON’/OFF	Frequency Adjust-Complement On /Off Pin
2	COMP:	Compensation Pin
3	FB	FeedBack Pin
4	GND	Ground Pin
5	SW	Switch Pin
6	FREQ.SYNC	Frequency Pin
7	Vin	Input Voltage Pin

LM2588 Key Features

Wide input voltage range: 4V to 40V
Adjustable switching frequency: 100 kHz to 200 kHz
External shutdown capability
Draws less than 60 µA when shut down
Frequency synchronization
Current-mode operation for improved transient response, line regulation, and current limit