2.1 Device Overview

The MCP1781 is an AEC-Q100 qualified LDO capable of supplying 200 mA of current over its operating temperature range, while considering the acceptable power dissipation of the device. The device is offered in two fixed output voltage options, 3.3V and 5V, as well as an adjustable version that supports output voltages ranging from 1.3V to 5V. The part is stable with a minimum 3.3 µF ceramic capacitor and features a high-voltage SHDN pin, low voltage Power Good feedback for the regulated output voltage, current foldback protection and extended operating temperature range: –40°C to +150°C. The device also features an adequate PSRR of –80 dB typical for low frequencies and –36 dB for high frequencies.

An innovative adaptive bias circuitry is used to lower the power consumption at no load and light loads, without compromising the dynamic response.

The internal discharge transistor is useful when powering microcontrollers and other applications that require fast supply disconnect.