RT9818C-29GVL

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A PMIC (power management integrated circuit) provides an interface between power supplies and various peripherals, boards, and subsystems in a system. PMICs are used to regulate and monitor the power system of a device, including the voltage and current conditions of the power supply and system components. RT9818C-29GVL is one kind of PMIC—a device Supervisors (also called "power management supervisors"—PMICs that provide fault protection and shutdown services to protect circuit functionality, even in the event of power fault. In this article, we will discuss RT9818C-29GVL application field and working principle.

Application Field of RT9818C-29GVL

RT9818C-29GVL is suitable for portable device, like notebook computer and tablet computer. It monitors the input voltage of system to enhance system reliability, and provides brown out (BOD) protection. In addition, RT9818C-29GVL also includes an active low system reset pin (RESET) asserts to indicate when the input power or one of the monitored voltages drops below the appropriate threshold. Moreover, RT9818C-29GVL also can be used in the platform of AMD Ryzen and offers a wide range of features and benefits—such as over-temperature protection, over-current protection, over-battery voltage protection, power-on-reset, and Watchdog timer—all integrated into one package, to satisfy different applications.

Working Principle of RT9818C-29GVL

The RT9818C-29GVLimplements power-on-reset, or POR. This function detects and indicates a power-on condition on the device\'s power supply rail. POR enables the system to initialize the device soon after power-up, or after any input power fault such as a brown-out or over-voltage condition.When the input voltage rises to a preset level (minimal overshoot), the device will issue a power-on reset, then we could active the process of external circuit. The RT9818C-29GVL also provides an active reset signal as soon as the input voltage drops below the under-voltage threshold, even if the voltage is too low fo the power-on reset circuit to detect.

The RT9818C-29GVLfeatures Watchdog Timer (WDT) to monitor the system. If a fault in the system results in an abnormal project operation, the WDT will time-out and reset the system. The RT9818C-29GVL also contains other functions such as built-in oscillator and manual reset. When the power is turned off or the manual reset is pressed (Reset#), the RT9818C-29GVL should reset the external circuitry. Then, the output voltage should also sequence OFF, then reset.

In addition, the RT9818C-29GVL includes an over-temperature protection (OTP) feature to protect itself and other components. When the junction temperature of the device exceeds 144°C, the OTP circuit shuts down the device. When the junction temperature drops below the OTP threshold (~125°C), the OTP circuit allows the device to be activated again. Therefore, the RT9818C-29GVL is used to protect other components from operating at elevated temperatures.

The RT9818C-29GVL also incorporates an over-current protection (OCP) feature. This is used to provide protection against over-current fault due to sudden surges, load transients, or abnormal operating conditions. The OCP circuit will automatically shut down the device when the output current exceeds the trip point.

Finally, the RT9818C-29GVL also includes an over-battery voltage protection (UVLO) feature. This is an advanced feature that monitors the input supply voltage and shuts down the device when the voltage drops below the under-voltage (UV) threshold. This feature prevents over-discharge of the battery, which may be hazardous to the system.

Conclusion

In conclusion, RT9818C-29GVL is one PMIC-Supervisors and suitable for protecting a variety of systems from power fault and over temperature, over current, and over battery voltage. It provides an active low system reset pin (RESET) asserts signal and various protection functions, such as power-on-reset, Watchdog timer, over-temperature protection, over-current protection, and over-battery voltage protection. In the broad market, it can be used in AMD Ryzen platform. Using the RT9818C-29GVLis sure to provide you with an superior level of safety and reliability.

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