MAX6865UK44D1L+T

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MAX6865UK44D1L+T is a Microchip superb supervisor product that belongs to their Power Management Integreted Circuits (PMIC) family. This product is specifically designed to monitor power supplies and respond to system voltages that exceed or drop below predetermined thresholds. In addition to monitoring system power supply voltages, this device also features other features such as two Watchdog timers, an integrated temperature sensor, and a pulse-by-pulse current limit.

Application field

MAX6865UK44D1L+T is primarily targeted for applications where it can monitor microcontroller power inputs, provide excess voltage protection, and limit system current. It is especially suitable for battery-powered systems due its low power consumption, which enables it to monitor multiple battery stages without significantly affecting overall system power requirements. This device has a wide range of applications in mobile medical, industrial, and household equipment, such as in cell phones, PDAs, MP3 players, LCD TVs, and USB device chargers.

Working Principle

The MAX6865UK44D1L+T provides four power protection functions: an under-voltage/over-voltage lockout (UV/OVLO), an over-current protection (OCP), an over-temperature protection (OTP) and a watchdog timer (WDT). When the power supply voltage is greater than the acceptable setpoint, the OVLO will trip and shut off the system. The OCP kicks in when the current draw exceeds a predetermined threshold and shuts down the system to protect against short circuit, while the OTP will trigger when the temperature reaches too hot and shuts down the system.

The watchdog timer requires an external timer to provide a regular pulse to reset and restart the system. If a pulse is not detected, the system will be locked out and will require manual intervention to reboot. This watch dog timer will also trigger in response to other events such as reset or power-down signals.

The MAX6865UK44D1L+T has a low quiescent current of less than 1µA (typical) and operates from 3.3V and 5.0V power supplies. It supports two digital input/output (I/O) ports and has a built-in open-drain reset for easy system reboots.

Conclusion

In summary, the MAX6865UK44D1L+T is a versatile supervisor from the PMIC portfolio of Microchip technology. Its low power consumption and high accuracy make it a great fit for battery-powered applications. Furthermore, its four power protection functions and the built-in WDT, OCP, and OTP supports provide safe and reliable system operation.

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