LM3940 1A Low Dropout Regulator IC for 5V to 3.3V Conversion

LM3940 1A Low Dropout Regulator IC for 5V to 3.3V Conversion 

The LM3940 is a low dropout (LDO) linear voltage regulator designed to provide a stable 3.3V output from a 5V input with a maximum output current of 1A. Its low dropout voltage allows efficient regulation even when the input voltage is close to the output voltage, making it ideal for microcontrollers, FPGAs, memory ICs, and other 3.3V digital circuits.

The LM3940 includes built-in thermal shutdown, short-circuit protection, and safe operating area protection, ensuring reliable and safe operation under a variety of conditions. Its simple design requires minimal external components, making it ideal for compact and efficient power supply designs.

Click here to view related products

Applications

• 5V to 3.3V voltage conversion for digital circuits
• Microcontroller and microprocessor power rails
• Embedded systems and development boards
• FPGA and CPLD core supply
• Memory ICs and sensor voltage supply
• Battery-powered and portable devices
• Consumer electronics and communication modules

Features

• Output Voltage: 3.3V DC
• Maximum Output Current: 1A
• Low Dropout Voltage: Typically 400mV at 1A load
• Input Voltage: 5V nominal
• Built-in thermal shutdown and short-circuit protection
• Excellent line and load regulation
• Low quiescent current for energy-efficient designs
• Stable operation with standard ceramic or electrolytic capacitors
• Compact and easy-to-use IC

LM3940-IC Datasheet