The LM2595 series of regulators are monolithic integrated circuits that provide all the
active functions for a step-down (buck) switching regulator, capable of driving a 1-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 LM2595 series operates at a switching frequency of 150 kHz, thus allowing
smaller-sized filter components than what would be needed with lower-frequency switching
regulators. Available in a standard 5-pin TO-220 package with several different lead bend options,
and a 5-pin TO-263 surface-mount package. Typically, for output voltages less than
12 V, and ambient temperatures less than 50°C, no heat sink is required.
A standard series of inductors are available from several different manufacturers
optimized for use with the LM2595 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 85-µA stand-by 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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