Model Overview

• Model Number: LM2596T-3.3
• Type: Fixed-output step-down voltage regulator
• Output Voltage: 3.3 V (fixed)
• Package: TO-220 (through-hole), 5 pins
• Series: LM2596 SIMPLE SWITCHER®

Electrical Specifications

• Input Voltage Range: 4.5 V to 40 V
• Output Current: Up to 3 A
• Switching Frequency: 150 kHz (fixed)
• Efficiency: Up to 73% (typical at 12 V input, 3 A load)
• Output Voltage Tolerance: ±4% over line and load conditions
• Standby Quiescent Current: ~80 µA (typical)

Protection Features

• Thermal Shutdown: Yes
• Current Limit: Yes (two-stage, cycle-by-cycle)
• TTL Shutdown Capability: Yes (via ON/OFF pin)

Pin Configuration

TableCopy

Thermal & Environmental Ratings

• Operating Temperature Range: -40°C to +125°C
• Storage Temperature Range: -65°C to +150°C
• Junction Temperature (Max): 150°C
• Thermal Resistance (Junction-to-Ambient):TO-220: 50°C/W (no heatsink)TO-220: 20°C/W (with heatsink and copper area)

Package Information

• Package Type: TO-220 (NDH)
• Lead Finish: Tin-plated (Sn)
• Mounting Style: Through-hole
• Quantity per Tube: 45 pieces
• RoHS Compliance: Yes (RoHS-compliant version available with /NOPB suffix)

Recommended External Components

• Input Capacitor: 470 µF, 35 V (low ESR aluminum electrolytic)
• Output Capacitor: 330 µF, 6.3 V (low ESR aluminum electrolytic or tantalum)
• Inductor: 22 µH (L41 type, 3 A rated)
• Catch Diode: 1N5823 (5 A, 20 V Schottky diode)

Applications

• Appliances
• Grid infrastructure
• EPOS (Electronic Point of Sale)
• Home theater systems
• General-purpose buck conversion from higher DC voltages to 3.3 V

Additional Notes

• Design Support: WEBENCH® Power Designer available for custom designs
• ESD Rating: ±2 kV (Human Body Model)
• MSL Rating: Level-1 (unlimited floor life)
• Part Marking: LM2596T-3.3 P+