Microchip 3.3V LDO Voltage Regulator 300mA SOT-23-5

Microchip 3.3V LDO Voltage Regulator 300mA provides a fixed 3.3V output at up to 300mA with a typical dropout voltage of 300mV.

This low dropout (LDO) regulator is designed for stable output in electronic circuits. It accepts a continuous input range of 3.6V to 16V, with an 18V absolute maximum, which allows it to be used across a range of power supply designs. Its typical quiescent current of 68µA helps conserve power in always-on or standby systems.

Key Features

• Fixed 3.3V output voltage with ±2.0% tolerance over -40°C to +125°C
• Output current up to 300mA
• Typical dropout voltage of 300mV
• Power supply ripple rejection (PSRR) of 70dB typical at 1kHz
• Typical quiescent current of 68µA
• Stable with an output capacitance of 1µF

Protection and Control

• Current fold-back protection under short-circuit conditions, with output current reducing towards 10mA
• Automatic recovery to normal operation once the fault is removed
• Over-temperature protection
• Power good output signal for system monitoring
• Shutdown input pin for external control, which further minimises power consumption when the regulator is not needed

Applications

The high ripple rejection makes the regulator suitable for AC-sensitive applications, including Ground Fault Circuit Interrupter (GFCI) and Arc Fault Circuit Interrupter (AFCI) circuit breakers, where clean and stable voltage is critical. It is also suited to battery-powered or low-voltage differential applications and to always-on or standby systems.

Package and Dimensions

The regulator is supplied in a compact, surface-mount SOT-23-5 package. It requires only 1µF of output capacitance, which helps save board space and cost. Recorded dimensions are Width: 3.3, Depth: 1.5 and Height: 4.3, with a weight of 0.033 gm.