Microchip Low Quiescent Current LDO Voltage Regulator 3.3V SOT-89

Overview

The Microchip Low Quiescent Current LDO Voltage Regulator is a fixed 3.3V low dropout (LDO) voltage regulator supplied in a compact 3-pin SOT-89 surface-mount package. It is designed for battery-powered and portable electronic applications where extended operational life is important.

This regulator provides a fixed 3.3V output with an output voltage tolerance of ±0.4% at 25°C and a maximum of ±3% across the full operating temperature range. Its quiescent current is typically 1.6µA, which helps to minimise battery drain in two and three primary cell battery packs or single-cell Li-Ion powered devices.

Key Performance Features

The regulator accepts an input voltage from 2.3V to 6.0V and can supply a maximum output current of 250mA. The dropout voltage is 178mV at a 250mA load, which supports stable operation as battery voltage decays. Short-circuit protection and over-temperature protection are included for added reliability.

Design Flexibility

Stable operation is achieved with a 1µF output capacitor, and ceramic, tantalum, or aluminium electrolytic capacitors can be used for both input and output. The power supply ripple rejection (PSRR) is 44dB, which helps to reduce noise on the input supply and contribute to a steadier output voltage.

Specifications

• Fixed output voltage: 3.3V
• Maximum output current: 250mA
• Input voltage range: 2.3V to 6.0V
• Dropout voltage: 178mV at 250mA load
• Quiescent current: 1.6µA (typical)
• Operating temperature range: -40°C to +125°C
• Package: 3-pin SOT-89 surface mount
• Weight: 0.459 g
• Dimensions (width x depth x height): 3.3 x 1.5 x 4.3

Suitable for battery-powered and portable designs that require a fixed 3.3V supply with low quiescent current.