MCP1799T-3302H/DB: A 300 mA High-Voltage, High-PSRR Low-Dropout Linear Regulator for Demanding Applications

In the realm of power management, stability and cleanliness of the supply voltage are paramount. The MCP1799T-3302H/DB stands out as a monolithic, high-voltage low-dropout (LDO) linear regulator engineered to deliver exceptional performance in challenging environments. This device is specifically designed to provide a fixed 3.3V output from input voltages as high as 80V, making it an indispensable component for a wide array of industrial, automotive, and telecommunications systems.

A defining characteristic of this LDO is its remarkably high Power Supply Rejection Ratio (PSRR). Achieving figures up to 75 dB at 1 kHz, the MCP1799T effectively attenuates unwanted noise and ripple from the input supply. This ensures a pristine, stable output voltage, which is absolutely critical for noise-sensitive circuitry such as RF modules, precision sensors, and data converters. This high PSRR performance is maintained across a wide frequency range, safeguarding the load from various sources of interference.

Despite its high-voltage capability, the regulator manages a low dropout voltage of typically 350 mV at the full 300 mA load. This efficiency minimizes power loss and heat dissipation, allowing for more compact and reliable designs. The device incorporates comprehensive protection features, including current limit, thermal shutdown, and input overvoltage protection, enhancing system robustness and longevity. Furthermore, its ability to operate over a junction temperature range of -40°C to +150°C ensures reliability in harsh operating conditions.

Housed in a space-efficient SOT-223 package, the MCP1799T-3302H/DB offers an optimal balance of performance, size, and thermal characteristics. Its minimal external component requirement—typically just input and output capacitors—simplifies design and reduces the overall bill of materials.

ICGOOFind: The MCP1799T-3302H/DB is a superior choice for designers seeking a robust, high-performance voltage regulation solution. Its unique combination of very high input voltage tolerance, excellent noise rejection, and robust protection features makes it ideal for powering core logic in applications subject to unstable and noisy power sources, such as industrial automation, automotive electronics, and smart meters.

Keywords: High-Voltage LDO, High PSRR, 300 mA Regulator, Low-Dropout Voltage, Thermal Protection.