The LM2594xx series of regulators are monolithic integrated circuits that provide all the
active functions for a step-down (buck) switching regulator, capable of driving a 0.5-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, and are packaged in a 8-pin PDIP and a 8-pin
surface-mount SOIC package.
Requiring a minimum number of external components, these regulators are simple to use and
feature internal frequency compensation, a fixed-frequency oscillator, and improved line and load
The LM2594xx 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. Because of its high efficiency, the copper traces on the printed-circuit board are
normally the only heat sinking needed.
A standard series of inductors (both through-hole and surface-mount types) are available
from several different manufacturers optimized for use with the LM2594xx series. This feature
greatly simplifies the design of switch-mode power supplies.
Other features include an ensured ±4% tolerance on output voltage under all conditions of
input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown
is included, featuring typically 85-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.
The LM2594HV is for applications requiring an input voltage up to 60 V.
View datasheet View product folder