Microchip MCP1790-3302E/DB: A Robust 300 mA High-Voltage Input LDO Voltage Regulator

In power management design, achieving stable, clean, and regulated voltage from a potentially noisy and variable input source is a fundamental challenge. The Microchip MCP1790-3302E/DB addresses this need with a specialized focus on high-input voltage applications, offering a reliable and highly integrated linear regulation solution.

This regulator is distinguished by its remarkably high input voltage capability, accepting voltages from 4.5V up to 30V. This makes it an ideal choice for systems directly powered from industrial buses, automotive power rails, or 24V industrial supplies, where voltage spikes and transients are common. Despite this high input range, it delivers a fixed, stable 3.3V output at up to 300 mA of continuous current, sufficient for powering microcontrollers, sensors, and various low-power circuitry.

A key advantage of the MCP1790 is its high power supply rejection ratio (PSRR). This metric indicates how effectively the LDO can filter out noise and ripple from the input source, ensuring a clean output voltage critical for noise-sensitive analog and RF components. Furthermore, the device boasts extremely low quiescent current, enhancing efficiency, which is particularly valuable in always-on or battery-backed applications.

Housed in a space-efficient SOT-223-3 package, the MCP1790-3302E/DB incorporates vital protection features such as internal current limiting and thermal shutdown, safeguarding both the regulator and the downstream load under fault conditions. Its minimal external component requirement—often just input and output capacitors—simplifies board design and reduces the overall bill of materials.

ICGOOODFIND: The Microchip MCP1790-3302E/DB stands out as a robust, high-performance LDO regulator that excels in harsh electrical environments. Its combination of a wide input voltage range, good output current capability, and excellent noise rejection makes it a superior choice for industrial, automotive, and networking applications where reliability is paramount.

Keywords: High-Voltage LDO, 300mA Regulator, Power Supply Rejection Ratio (PSRR), Wide Input Voltage Range, Thermal Shutdown Protection.