LM7812

Part: LM340, LM340A, LM7805, LM7812, LM7815 from Texas Instruments

Type: Fixed Voltage Regulator

Description: The LM340 and LM7805 Family are monolithic 3-terminal positive voltage regulators capable of delivering over 1.5-A output current, available in fixed 5-V, 12-V, and 15-V options, and feature internal current-limiting, thermal shutdown, and safe-area compensation.

Operating Conditions:

• Supply voltage: 7–30 V
• Operating temperature: 0 to 125 °C
• Output voltage options: 5 V, 12 V, 15 V

Absolute Maximum Ratings:

• Max supply voltage: 35 V
• Max continuous current: 1.5 A
• Max junction/storage temperature: 150 °C

Key Specs:

• Output voltage tolerance (LM340A, T J = 25°C): ±2% (4.9 V to 5.1 V for 5 V output)
• Line regulation (LM340A, T J = 25°C, 7.5 V ≤ V IN ≤ 20 V): 3 mV (typ), 10 mV (max)
• Load regulation (LM340A, T J = 25°C, 5 mA ≤ I O ≤ 1.5 A): 10 mV (typ), 25 mV (max)
• Quiescent current (LM340A, T J = 25°C): 6 mA (max)
• Ripple rejection (LM340A, f = 120 Hz, I O = 1 A, T J = 25°C): 68 dB (min), 80 dB (typ)
• Dropout voltage (LM340A, T J = 25°C, I O = 1 A): 2 V (typ)
• Output resistance (LM340A, f = 1 kHz): 8 mΩ (typ)
• Peak output current (T J = 25°C): 2.4 A (typ)

Features:

• Output Current up to 1.5 A
• Available in Fixed 5-V, 12-V, and 15-V Options
• Output Voltage Tolerances of ±2% at T J = 25°C (LM340A)
• Line Regulation of 0.01% / V of at 1-A Load (LM340A)
• Load Regulation of 0.3% / A (LM340A)
• Internal Thermal Overload, Short-Circuit and SOA Protection
• Available in Space-Saving SOT-223 Package
• Output Capacitance Not Required for Stability

Applications:

• Industrial Power Supplies
• SMPS Post Regulation
• HVAC Systems
• AC Inventors
• Test and Measurement Equipment
• Brushed and Brushless DC Motor Drivers
• Solar Energy String Invertors

Package:

• DDPAK/TO-263 (3 pins)
• SOT-223 (4 pins)
• TO-220 (3 pins)
• TO-3 (2 pins)

• 1 · Output Current up to 1.5 A
• Available in Fixed 5-V, 12-V, and 15-V Options
• Output Voltage Tolerances of ±2% at TJ = 25°C (LM340A)
• Line Regulation of 0.01% / V of at 1-A Load (LM340A)
• Load Regulation of 0.3% / A (LM340A)
• Internal Thermal Overload, Short-Circuit and SOA Protection
• Available in Space-Saving SOT-223 Package
• Output Capacitance Not Required for Stability

• Industrial Power Supplies
• SMPS Post Regulation
• HVAC Systems
• AC Inventors
• Test and Measurement Equipment
• Brushed and Brushless DC Motor Drivers
• Solar Energy String Invertors

SPACE

IOUT = 1 A, 0°C ≤ TJ ≤ 125°C (LM340A) unless otherwise specified (1)

over operating free-air temperature range (unless otherwise noted) (1)(2)

over operating free-air temperature range (unless otherwise noted)

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The LM340x and LM7805 series is designed with thermal protection, output short-circuit protection, and output transistor safe area protection. However, as with any IC regulator, it becomes necessary to take precautions to assure that the regulator is not inadvertently damaged. The following describes possible misapplications and methods to prevent damage to the regulator.