RT9818C-15GV

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PMIC - Supervisors

RT9818C-15GV is a series of positive-voltage supervisor ICs designed to monitor power-on conditions and system activity in a variety of system applications. This series is a one-chip voltage monitoring IC. It monitors system supplies and provides a reset signal. It is used to reset the system when any system power rail falls below the threshold voltage. Available in SOT-23-6 and SOT-25-6 packages, the RT9818C-15GV series is capable of monitoring a range of inputs, including positive, negative and zero voltages.

Application Field

RT9818C-15GV is suitable for applications in various monitoring and power-on reset requirements, including desktop and notebook computers, servers, MP3 players, LCD TVs and other digital systems. Its low operating current and wide operating temperature range make it suitable for monitoring and controlling low-power or high-temperature systems.

The RT9818C-15GV operates with inputs of 3.2V, 4V, 5V, 5.5V, 6V, 6.5V, 7.5V and 9V. In addition to these standard input levels, it provides configurable thresholds, allowing it to be used with a variety of voltages and input signal conditions. Also, the reset output of these ICs can be set to either positive reset or negative reset.

The RT9818C-15GV also features a wide range of warning signals, including an under voltage warning signal and over voltage warning signal. Additionally, it can be used in conjunction with a system power supervisor to provide dynamic reset output. This allows the system to reset in the event of a power rail failure.

Working Principle

The RT9818C-15GV uses four detection circuits, one for each input voltage. Each detection circuit comprises of a comparator, a reference voltage source, a current feedback loop, and a voltage and current regulator. The comparator senses the input voltage and compares it with the reference voltage. If the input voltage is higher than the reference voltage, the output signal of the comparator is set to ‘high’. Otherwise, the output signal of the comparator is set to ‘low’. If the voltage is too low, the current feedback loop will provide additional current to the reference voltage source, thus increasing the reference voltage.

The voltage and current regulator is responsible for maintaining the reference voltage, while the current feedback loop is used to monitor the input current and adjust the reference voltage accordingly if the input current is outside the set range.

The output signal of the RT9818C-15GV can be used as a reset signal to reset the system. It can also be used as an input to a warning system, as it can detect a wide range of input voltages. Additionally, the reset output can be set to either a positive or negative reset.

Conclusion

RT9818C-15GV is a series of positive-voltage supervisors capable of monitoring a range of inputs, including positive, negative and zero voltages. They are suitable for applications requiring monitoring of power-on conditions and system activities. The IC has several features, such as configurable threshold voltages, a wide range of warning signals and dynamic reset output capability. It is available in SOT-23-6 and SOT-25-6 package.

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