LM2596T-3.3

The LM2596series of regulators are monolithic integrated circuit that provides all the active functions for a step- down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. The LM2596available in fixed output voltages of 3.3V, 5V, 12Vand 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 LM2596series operates at a switching frequency of 150kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. A standard of inductors optimized for use with the LM2596are available from several different manufacturers. This feature greatly simplifies the design of switch- mode power supplies. Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring 50μA (typical) standby current. The output switch includes cycle- by- cycle current limiting, as well as thermal shutdown for full protection under fault conditions. The LM2596is available in TO220T- 5 and TO263- 5 package.

Applications

• Simple High- Efficiency Step- Down (Buck) Regulator
• Efficient Pre- Regulator for Linear Regulators
• On- Card Switching Regulators
• Positive to Negative Converter (Buck- Boost)

Key features

• 3.3V, 5V, 12V and Adjustable Output Versions
• High Efficiency
• Wide Input Voltage Range up to 40V
• Guaranteed 3A Output Current
• Requires only 4 External Components
• 150kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability, Low Power Standby Mode
• Uses Readily Available Standard Inductors
• Thermal Shutdown and Current Limit Protection
• Adjustable Version Output Voltage Range, 1.23V to 37V±4% Max Over Line and Load Conditions