Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Open Drain or Open Collector
Reset:	Active Low
Reset Timeout:	35 ms Minimum
Voltage - Threshold:	1.8V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	TO-236-3, SC-59, SOT-23-3
Supplier Device Package:	SOT-23-3

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Introduction

PMIC, or Power Management Integrated Circuits, are designed to simplify the design of power management systems by combining the control, monitoring, and protection functions of multiple sub-systems into a single unit. Supervisors are one of the key components of PMIC, in charge of regulating the voltage of the system. In this article, the RT9818B-18GV Supervisor will be the focus. It will discuss the application field, and elaborate on its working principle.

Application Field of the RT9818B-18GV Supervisor

The RT9818B-18GV is a low-voltage high-efficiency supervisor, widely used in various portable electronic devices. It is well suited for PDAs, palmtops, cell phones, portable game consoles and the like. The main feature of the RT9818B-18GV Supervisor is that it is able to provide reliable power management from a low-voltage source. Thanks to its built-in intelligent circuit and 4.5V to 5.5V wide input voltage range. It also offers programmable overvoltage trip point and reset threshold. In addition, it features a built-in low battery detection circuit which can be used to detect low battery levels. The RT9818B-18GV also features a minimal power consumption design. It has minimal quiescent current of 9μA, and average operating current consumption of 8mA. This makes it an ideal choice for applications where low power consumption is critical.

Working Principle of the RT9818B-18GV Supervisor

The main job of a power supervisor is to monitor and regulate the power supply voltage of the system. They do this by using a comparator circuit, which compares the voltage level of the power supply against a reference voltage. The RT9818B-18GV Supervisor contains a programmable comparator circuit. This programmable comparator can detect when the system’s power supply voltage goes above or below a certain threshold, or \'trip point\'. Once this threshold is detected, the supervisor will adjust the power supply voltage to keep it within the correct range. The RT9818B-18GV Supervisor also has a programmable reset threshold, which is used to detect when the system’s power supply has gone down too low. When the reset threshold is tripped, the supervisor will reset the system, restoring power supply to normal. In addition, the RT9818B-18GV Supervisor also includes a low battery detection circuit. This circuit continuously monitors the battery voltage, and is able to detect when the battery is getting low. When this happens, the supervisor will trigger a warning signal, alerting the user to replace or recharge the battery.

Conclusion

The RT9818B-18GV is an advanced, low-voltage, high-efficiency supervisor designed for use in portable electronic devices. It offers a low-voltage input range and low-power consumption design, as well as programmable overvoltage and reset thresholds, and a low battery detection circuit. The RT9818B-18GV’s built-in comparator circuit monitors the system’s power supply voltage, and is able to detect when it goes outside the correct range, adjusting it back to ensure stable operation. Thus, the RT9818B-18GV is an ideal choice for applications where low power consumption and reliability are critical.

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