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    General 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 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.


    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


    Simple high-efficiency step-down (buck) regulator
    On-card switching regulators
    Positive to negative converter
    Note: †Patent Number 5,382,918.
    Consultation Data Manual



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