MICROCHIP MCP1703T-3302E/MB 3.3V 250mA Fixed LDO Voltage Regulator

The MICROCHIP MCP1703T-3302E/MB is a CMOS low dropout (LDO) voltage regulator designed for highly efficient and reliable power management. It delivers a fixed output of 3.3V with a robust current capacity of up to 250mA, while consuming a remarkably low quiescent current of just 2μA (typical). This exceptional efficiency makes it an ideal choice for battery-powered applications, extending operational life.

Featuring a wide input voltage range from 2.7V to 16V, this regulator is versatile for use with two to six primary cells, 9V alkaline batteries, or one to two-cell Li-ion battery packs. It maintains excellent performance with a low dropout voltage, requiring only 525mV (typical) of input-to-output differential to deliver its rated current, ensuring stable operation even as battery voltage decays.

Key Features & Reliability

The device boasts tight output voltage tolerance, typically within ±0.4% at 25°C, and maintains a maximum ±3% deviation across the full operating temperature range of -40°C to +125°C. It offers excellent line regulation of ±0.1% typical. For stability, it requires only a minimal 1μF output capacitor and is compatible with a wide range of 1μF to 22μF ceramic, tantalum, or aluminium electrolytic capacitors on both input and output.

Built-in protection features include short-circuit and over-temperature protection, safeguarding both the regulator and the connected circuitry. Its surface-mount SOT-89-3 package is compact and designed for modern PCB assembly, making it a perfect fit for space-constrained designs.

Applications

This regulator is exceptionally well-suited for a variety of low-power electronic applications, including portable consumer electronics, sensing instrumentation, and general power management subsystems where stable, clean voltage from a fluctuating battery source is critical.