LM2596

LM2596 TO-220-5 TO-263-5General Description 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 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustableoutput 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 needed with lower frequency switching regulators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead 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 power supplies. Other features include a guaranteed ±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 over temperature shutdown for complete protection under fault conditions. Features-3.3V, 5V, 12V, and adjustable output versions-Adjustable version output voltage range, 1.2V to 37V ±4% max over line and load conditions-Available in TO-220 and TO-263 packages-Guaranteed 3A output load current-Input voltage range up to 40V-Requires only 4 external components-Excellent line and load regulation specifications-150 kHz fixed frequency internal oscillator-TTL shutdown capability-Low power standby mode, IQ typically 80 μA-High efficiency-Uses readily available standard inductors-Thermal shutdown and current limit protection Applications-Simple high-efficiency step-down (buck) regulator-On-card switching regulators-Positive to negative converter