LM2596S-ADJ

The LM2596S series are easy-to-use fixed and adjustable step-down (Buck) switching mode voltage regulators. The series offers fixed output voltage versions of 3.3V, 5V, and 12V, as well as an adjustable output version. All versions are capable of driving a 3.5A load with excellent line and load regulation. These regulators require minimal external components, are easy to use, and integrate internal frequency compensation and a fixed-frequency oscillator. Under specified input voltage and output load conditions, output voltage accuracy is guaranteed within ±3% tolerance. Oscillator frequency accuracy is guaranteed within ±15%. The device includes an external shutdown function with a typical quiescent current of 80μA. Self-protection features include two-stage frequency-reduction current limiting for the output switch and over-temperature shutdown, providing comprehensive protection under fault conditions.

Applications

• Simple and efficient step-down regulator
• On-board switching regulator
• Positive-to-negative voltage converter
• LCD monitors and LCD TVs
• Battery chargers
• Microprocessor 3.3V buck supply

Key features

• Fixed output voltages of 3.3V, 5V, 12V and adjustable output versions available
• Output voltage adjustable from 1.23V to 37V
• Internal oscillator fixed frequency at 150kHz
• Guaranteed 3.5A output load current
• Input voltage up to 45V
• Low-power standby mode with typical quiescent current of 80μA
• TTL-level shutdown supported
• Excellent line and load regulation
• Only 4 external components required
• High efficiency
• Thermal shutdown and current limiting protection