LM2596

• New product available: LMR33630 36-V, 3-A, 400-kHz synchronous converter
• 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 four external components
• Excellent line and load regulation specifications
• 150-kHz Fixed-frequency internal oscillator
• TTL shutdown capability
• Low power standby mode, I_Q, 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

All trademarks are the property of their respective owners.

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 fixed-frequency 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 5-pin TO-220 package with several different lead bend options, and a 5-pin TO-263 surface mount package.

The new product, LMR33630, offers reduced BOM cost, higher efficiency, and an 85% reduction in solution size among many other features. See the device comparison table to compare specs. Start WEBENCH Design with LMR33630.

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 ±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 overtemperature shutdown for complete protection under fault conditions.