LM2596

HTC Korea 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 voltages range from 1.2V to 37V. These regulators were designed to minimize the number of external components to simplify the power supply design. Standard series of inductors optimized for use with the LM2596 are offered by several different inductor manufacturers. Since the LM2596 converter is a switch-mode power supply, its efficiency is significantly higher in comparison with popular three-terminal limear reguators, 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 switch-mode 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.

LM2596 features :

• 3.3V, 5.0V, 12V and adjustable output versions
• Adjustable output voltage range, 1.2V to 37V
  ±4% max. over line and load conditions
• Guaranteed 3A output current
• 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

LM2596 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