MICROCHIP Fixed LDO Voltage Regulator, 3.3V, 150mA, SOT-89-3

The MICROCHIP MCP1754ST-3302E/MB is a CMOS low-dropout (LDO) voltage regulator designed for efficient and reliable power management. It delivers up to 150mA of output current while maintaining an exceptionally low quiescent current of just 56μA (typical), making it ideal for battery-sensitive and portable applications. The input voltage range of 3.6V to 16.0V offers broad compatibility, suitable for systems powered by four to six primary cells, 12V mobile sources, or one to three-cell Li-ion batteries.

A key advantage of this regulator is its low dropout voltage of only 300mV (typical) at full load, which maximises usable battery life by allowing operation with input voltages very close to the regulated output. The device provides a fixed 3.3V output with high accuracy, featuring a typical tolerance of ±0.2% at room temperature and a maximum ±2.0% across the full operating temperature range of -40°C to +125°C.

Robust Protection & Features

Engineered for stability and resilience, the regulator includes comprehensive protection features such as true current foldback, short-circuit protection, and over-temperature shutdown. It remains stable with a minimal 1μF output capacitor and offers additional control through a shutdown input and a 'power good' output signal for system monitoring. Its typical power supply rejection ratio (PSRR) is greater than 70dB at 1kHz, ensuring a clean, stable output voltage even with noisy input supplies.

Applications

This versatile LDO is perfectly suited for a wide array of electronic designs requiring precise, low-noise voltage regulation. Its combination of low quiescent current, wide input range, and robust protection makes it a cornerstone component for modern power management solutions.

Specifications

• Output Current: 150mA Max
• Quiescent Current: 56μA Typical
• Dropout Voltage: