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 5V, 12V, 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 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.
LM2596T-ADJ TO-220-5 Specification:
Available in an adjustable output voltage range of 1.23 V − 37 V.
Maximum of 3.0 A output load current guaranteed.
Available in TO-220-5
Wide input voltage range up to 40 Volts.
A 150 kHz fixed frequency internal oscillator.
It requires only 4 external components.
TTL shutdown capability (for digital/ analog ON/OFF)
Low power standby mode, as low as 80 uA when in standby mode.
Internal thermal shutdown and current limit protection.