NCV8668ABD133R2G

Introduction

PMIC (or Power Management IC) is an integrated circuit designed to monitor and control a power system. PMICs are typically used to bring two rail voltages into balance and regulate the flow of currents to allow the system to run without interruption. The NCV8668ABD133R2G is a low dropout (LDO) voltage regulator that is specifically designed for automotive applications.

Application Field

The NCV8668ABD133R2G is a linear voltage regulator specifically designed for automotive applications. It is used to regulate a minimum of 3 rail voltages with a wide input voltage range of 4.5V to 19V. The NCV8668ABD133R2G can provide up to 1.8A of output current, with a maximum output voltage of 3.3V. The device features a low quiescent current of 10µA, low dropout voltage of 0.35V, high power supply rejection ratio (PSRR), low output noise, over-temperature protection and a programmable output voltage.

Working Principle

The NCV8668ABD133R2G operates by taking a voltage from the input rail and reducing its magnitude to the set output voltage level. This is done by dissipating power in the form of heat and is managed via a control loop. The control loop consists of an error amplifier, an output transistor and a feedback network. The error amplifier monitors the output voltage and compares it to the set reference voltage of the regulator. The difference between these two voltages creates the error voltage, which is then amplified and used to control the output transistor. The output transistor is a P-channel MOSFET, which is used to limit the current flow to the output rail and also helps regulate the output voltage. The feedback network is composed of resistors connected between the output and the ground reference, and sense the actual output voltage.

Conclusion

NCV8668ABD133R2G is a linear voltage regulator designed specifically for automotive applications. It is designed to regulate a minimum of three rail voltages with a wide input voltage range, and can provide up to 1.8A of output current, with a maximum output voltage of 3.3V. The device features a low quiescent current, low dropout voltage, high power supply rejection ratio, low output noise, over-temperature protection, and a programmable output voltage. The control loop consists of an error amplifier, an output transistor, and a feedback network, which work together to regulate the output voltage.