The LM2596 series of regulators are monolithic integrated circuits that provide all the
active functions for a step-down (buck) switching regulator, capable of driving a 3-A load with
excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V,
5 V, 12 V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and
include internal frequency compensation, and a fixed-frequency oscillator.
The LM2596 series operates at a switching frequency of 150 kHz, thus allowing smaller
sized filter components than what would be required with lower frequency switching regulators.
Available in a standard 7-pin TO-220 package with several different lead bend options, and a 7-pin
TO-263 surface mount package.
A standard series of inductors are available from several different manufacturers
optimized for use with the LM2596 series. This feature greatly simplifies the design of switch-mode
Other features include a ±4% tolerance on output voltage under specified input voltage
and output load conditions, and ±15% on the oscillator frequency. External shutdown is included,
featuring typically 80 µA standby current. Self-protection features include a two stage frequency
reducing current limit for the output switch and an overtemperature shutdown for complete
protection under fault conditions.
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