MAX6385XS21D2-T

Power Management Integrated Circuits (PMIC) are an important component of any electronic system. PMICs are responsible for controlling power flows, protecting the system from overvoltage, and providing proper signal levels. Such an example of a PMIC is the MAX6385XS21D2-T, which belongs to the Supervisors category. This article will explain its application field, as well as its working principle.

Application Field

The MAX6385XS21D2-T is a micro-power voltage supervisor designed for use in portable electronic applications. It is suitable for use as a supervisor for portable or handheld devices where low-current consumption is required. It is also suitable for use in digital cameras, camcorders, cell phones, PDAs and other battery-powered applications.

The built-in spare cell detection feature is designed to monitor the presence of a spare battery or other power source. When the spare cell voltage drops below 1.2V, the MAX6385XS21D2-T will automatically switch to the spare cell. This allows the system to retain its resettable behavior even during brief battery changes or low battery levels of mainline cells.

Working Principle

The MAX6385XS21D2-T features a unique dual-comparator architecture with a low quiescent current of 150nA. The lower comparator monitors the mainline supply voltage while the upper comparator is used to monitor a spare cell or other power source. The dual-comparator architecture allows for very low current consumption while providing a very accurate voltage threshold.

The MAX6385XS21D2-T has an internal set of resistors that allow for an adjustable voltage threshold. This adjustable voltage threshold can be used to reduce power consumption as well as to reduce false triggers due to line noise. The voltage threshold can be adjusted by connecting an external resistor between the RT pin and the V+ pin.

The MAX6385XS21D2-T also features an overvoltage lockout feature that protect systems from excessive voltage levels. This feature can be enabled by connecting an external resistor between the OV pin and the V+ pin. When an overvoltage condition occurs, the supervisor will automatically shut down the system to prevent damage.

Conclusion

The MAX6385XS21D2-T is a micro-power voltage supervisor designed for use in portable electronic applications. It is suitable for use as a supervisor for portable or handheld devices where low-current consumption is required. The supervisor features a low quiescent current of 150nA and a built-in spare cell detection feature. The supervisor also features an adjustable voltage threshold and an overvoltage lockout feature to protect the system from excessive voltage levels.