MICROCHIP MCP1755T-3302E/OT 3.3V LDO Voltage Regulator, 300mA, SOT-23-5

The MICROCHIP MCP1755T-3302E/OT is a high-performance, low dropout (LDO) voltage regulator designed for stability and precision in demanding electronic circuits. This fixed 3.3V output regulator can deliver up to 300mA of current with an exceptionally low dropout voltage of just 300mV typical, making it highly efficient for battery-powered or low-voltage differential applications. Its wide input operating range of 3.6V to 16V continuous (18V absolute max) offers great flexibility in various power supply designs.

A standout feature is its excellent power supply ripple rejection (PSRR), typically 70dB at 1kHz. This high level of noise rejection makes it an ideal choice for AC-sensitive applications such as Ground Fault Circuit Interrupter (GFCI) and Arc Fault Circuit Interrupter (AFCI) circuit breakers, where clean, stable voltage is critical. The device also boasts a very low typical quiescent current of 68µA, helping to conserve power in always-on or standby systems.

Robust Protection Features

Engineered for reliability, this regulator incorporates comprehensive protection mechanisms. It features true current fold-back protection under short-circuit conditions, where the output current reduces towards 10mA to protect the device and circuit. Once the fault is removed, it automatically recovers to normal operation. Additional safeguards include over-temperature protection and a 'power good' output signal for system monitoring. A shutdown input pin allows for external control to further minimise power consumption when the regulator is not needed.

Specifications & Integration

The device offers a tight output voltage tolerance of ±2.0% over its entire operating temperature range (-40°C to +125°C), ensuring consistent performance in harsh environments. It remains stable with a minimal output capacitance of just 1µF, saving board space and cost. Housed in a compact, surface-mount SOT-23-5 package, it is an