The LM2586 series of regulators are monolithic integrated circuits 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, these regulators are 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 3.0A NPN device that can stand-off 65V. Protecting the power switch
are current and thermal limiting circuits, and an undervoltage 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
Other features include soft start mode to reduce in-rush current during start up, and
current mode control for improved rejection of input voltage and output load transients and
cycle-by-cycle current limiting. The device also has a shutdown pin, so that it can be turned off
externally. An output voltage tolerance of ±4%, within specified input voltages and output load
conditions, is ensured for the power supply system.
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