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1 Features
1• 3.3-V, 5-V, 12-V, and Adjustable Output Versions
• Adjustable Version Output Voltage Range: 1.2-V
to 37-V ± 4% Maximum Over Line and Load
Conditions
• Available in TO-220 and TO-263 Packages
• 3-A Output Load Current
• Input Voltage Range Up to 40 V
• 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
• Create a Custom Design Using the LM2596 with
the WEBENCH Power Designer
2 Applications
• Simple High-Efficiency Step-Down (Buck)
Regulator
• On-Card Switching Regulators
• Positive to Negative Converter
3 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 3-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.
Requiring a minimum number of external
components, these regulators are simple to use and
include internal frequency compensation, and a fixedfrequency
oscillator.
The LM2596 series operates at a switching frequency
of 150 kHz, thus allowing smaller sized filter
components than what would be required with lower
frequency switching regulators. Available in a
standard 7-pin TO-220 package with several different
lead bend options, and a 7-pin TO-263 surface mount
package.
TO-263-5
1.2 V to 37 V
3 A
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