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

The Microchip Fixed LDO Voltage Regulator 3.3V 150mA SOT-89-3 is a CMOS low-dropout (LDO) voltage regulator that provides a fixed 3.3V output and delivers up to 150mA of output current. It is designed for efficient power management in battery-sensitive and portable designs.

Overview

The regulator accepts an input voltage range of 3.6V to 16.0V, offering compatibility with systems powered by four to six primary cells, 12V mobile sources, or one to three-cell Li-ion batteries. Its typical dropout voltage of 300mV at full load allows operation with input voltages close to the regulated output, which helps maximise usable battery life.

Key Features

• Fixed 3.3V output with a typical tolerance of ±0.2% at room temperature
• Maximum tolerance of ±2.0% across the operating temperature range of -40°C to +125°C
• Output current of up to 150mA
• Typical quiescent current of 56μA
• Shutdown input and power good output for system monitoring

Protection and Stability

The regulator includes true current foldback, short-circuit protection, and over-temperature shutdown. It remains stable with a minimal 1μF output capacitor and has a typical power supply rejection ratio (PSRR) of greater than 70dB at 1kHz, supporting a clean, stable output voltage even with noisy input supplies.

Applications

This LDO voltage regulator suits a wide range of electronic designs requiring precise, low-noise voltage regulation. Its combination of low quiescent current, wide input range, and protection features makes it suitable for battery-sensitive and portable applications.