LM2596SX-5.0/NOPB

FEATURES

23• 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

• Ensured 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

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 ensured ±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. 

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