MAX6865UK45D2L+T

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Power management integrated circuits (PMICs) are essential semiconductor devices that manage power supply requirements at the system level. PMICs control power supply voltages and currents, protect against over-voltage and over-current conditions, and ensure a safe and reliable power supply to electronic components. There are many different types of PMICs, including supervisors, regulators, hot swap controllers, drivers, and more. Supervisors are PMICs used to monitor system voltages to ensure they remain within the specified operating range. This paper looks at the application field and working principle of the MAX6865UK45D2L+T supervisor PMIC.

MAX6865UK45D2L+T Application Field

The MAX6865UK45D2L+T is a low-power supervisor with a built-in regulator. It is designed for cost-sensitive, space-constrained systems that require reliable power monitoring and reset control, such as embedded microcontroller-based systems. The device monitors two system voltages, independently sourcing a reset signal when one or both voltages fall below their undervoltage thresholds. It also provides an adjustable precision voltage reference and an open-drain diagnostic output that signals when the reset signal is asserted. The device is available in small-footprint 8-pin SOIC, 8-pin µDFN, and 8-pin TDFN packages.

MAX6865UK45D2L+T Working Principle

The MAX6865UK45D2L+T supervisor device contains two undervoltage monitoring channels that monitor the voltage levels of two system pins. The device’s internal voltage reference is adjustable from 0.9V to 3.2V, allowing the user to specify the undervoltage threshold for each channel. Each channel is connected to a comparator that triggers a reset signal when the voltage on the monitored pin drops below the specified undervoltage threshold. The reset signal is a logic high pulse with an adjustable width from 50µs to 500µs. The device also has a status output that indicates the active state of the reset signal.

The MAX6865UK45D2L+T is provided with an internal regulator to supply the circuitry. The regulator can be powered from either the system supply or an external supply. The device has a programmable hold-up time of 128ms to 640ms, allowing the device to maintain power long enough to enable other backup power sources to take over when necessary. The device is also provided with an internal watchdog timer, with a programmable time-out of 4.096s to 524.28s.

Conclusion

The MAX6865UK45D2L+T supervisor is a low-power device designed for cost-sensitive, space-constrained systems that require reliable power monitoring and reset control. The device has two channels for monitoring system voltages and an adjustable precision voltage reference. It also has an internal regulator and an adjustable hold-up time to maintain power during system outages. The device is available in small-footprint packages and is an ideal solution for power supply monitoring and protection applications.

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