LM2596R-ADJ

The LM2596 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step-down switching regulator (buck converter). All circuits of this series are capable of driving a 3.0A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V,12V, and an adjustable output version. These regulators were designed to minimize the number of external components to simplify the power supply design. Since the LM2596 converter is a switchmode power supply, its efficiency is significantly higher in comparison with popular three-terminal linear regulators, especially with higher input voltages. In many cases, the power dissipated is so low that no heatsink is required or its size could be reduced dramatically. A standard series of inductors optimized for use with the LM2596 are available from several different manufacturers. This feature greatly simplifies the design of switchmode power supplies. The LM2596 features include a guaranteed +/-4% tolerance on output voltage within specified input voltages and output load conditions, and +/-15% on the oscillator frequency (+/-2% over 0 °C to 125 °C). External shutdown is included, featuring 80μA (typical) standby current. Self-protection features include a two stage frequency reducing current limit for output switch and an over temperature shutdown for complete protection under fault conditions.

Applications

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

Key features

• 3.3V, 5.0V, 12V, and Adjustable Output version
• Adjustable Output Voltage range, 1.2V to 37V ±4% Max. Over Line and Load conditions
• Guaranteed Output Current of 3A
• Available in TO-263, TO-220 Packages
• Requires Only 4 External Components
• Excellent Line and Load Regulation Specifications
• 150kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability
• Low Power Standby Mode, IQ typically 100mA
• Thermal Shutdown and Current Limit Protection
• Moisture Sensitivity Level 3