RT9818C-27GU3

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PMIC - Supervisors are a type of power management IC that is mainly used to monitor the voltage and current supply to other components on the circuit. They act as a circuit breaker and protect the IC from damage due to over-voltage and over-current. The RT9818C-27GU3 is a PMIC - Supervisor IC from Richtek. In this article, we will discuss the application field and working principle of RT9818C-27GU3.

Application Fields

The RT9818C-27GU3 is designed to provide over-voltage protection, short-circuit protection, and power sequencing to other power management devices like voltage regulators and power MOSFETs. It is mainly used in ICs that generate large amounts of heat, such as LED drivers and power amplifiers, due to its fast response time and efficient protection. This application field also includes TV and projectors, DC and AC motor controllers, and battery chargers.

Working Principle

The RT9818C-27GU3 is a self-contained, high-accuracy, and low-power-dissipation voltage and current monitor IC. It detects over-voltage and over-current conditions and quickly shuts down the power supply. The RT9818C-27GU3 monitors both the input voltage and the output current by comparing them to two thresholds: one for over-voltage, and the other for over-current. If any of the two conditions are detected, an output signal is generated, and the power supply is disabled. The RT9818C-27GU3 is equipped with a soft-start feature that controls the ramp rate of the input voltage and ensures smooth power-up and power-down transitions.

The RT9818C-27GU3 also features over-temperature protection, which prevents the device from overheating. The device monitors the temperature and shuts down the power supply if the temperature exceeds a set threshold. This helps protect the device from damage due to excessive heat. The RT9818C-27GU3 also features an adjustable hysteresis level for both output current and input voltage.

Conclusion

The RT9818C-27GU3 is a PMIC - Supervisor IC from Richtek. It provides over-voltage protection, short-circuit protection, power sequencing, and over-temperature protection. It is mainly used in application fields like LED drivers and power amplifiers, TV and projectors, DC and AC motor controllers, and battery chargers. The RT9818C-27GU3 features a soft-start feature that controls the ramp rate of the input voltage and ensures smooth power-up and power-down transitions. It also features adjustable hysteresis level for both output current and input voltage.

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