MAX6751KA22+T

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PMIC Supervisors are a segment of the chip module family which acts as a supervisor of power supply circuits, stabilizing the output voltage of voltage regulators and reporting faults to the host application. The MAX6751KA22+T is a good example of such a module, and is used in applications such as digital cameras, cordless phones, PDAs, and many other portable devices. This article will discuss the application field and working principle of the MAX6751KA22+T.

Application Field

The MAX6751KA22+T is a 3V supervisor with an integrated active low reset input/output pin. It is designed to detect a power supply failure and alert the microprocessor when such a failure occurs, through the reset pin. With this ability, the MAX6751KA22+T has found application in a range of portable devices, such as digital cameras, cordless phones, PDAs, and many more. It is especially useful for mobile device applications, as mobile device batteries often lack the necessary output regulation and signal superb ration. The MAX6751KA22+T is thus used to automatically reset and protect the device when the incoming power supply deviates from the desired voltage.

Working Principle

The MAX6751KA22+T is a power-good signal generator with an integrated active low reset circuit, two push-pull outputs, a reset threshold voltage range of 1.7V to 3.6V, and a delay range of 12ms to 340ms. It measures the incoming power supply voltage, and when the incoming power supply voltage reaches the preset level, it immediately sends an active low signal - “Power-Good”, to the microprocessor. When the incoming power reaches a value greater than the preset reset level, the MAX6751KA22+T sends a low active signal to the microprocessor, which can be used to reset the microprocessor or check the status of the microprocessor. The block diagram of the MAX6751KA22+T consists of a comparator and a hysteretic voltage reference, which are responsible for comparing the input voltage from the power supply with the preset voltage value, and producing the active low reset signal.

Conclusion

The MAX6751KA22+T is a power supply supervisor which is designed to detect a power supply failure and alert the microprocessor when such a failure occurs, through the reset pin. With its built-in active low reset input/output pin, the MAX6751KA22+T has found application in a range of portable devices, such as digital cameras, cordless phones, PDAs, and many more. The MAX6751KA22+T is composed of a comparator and a hysteretic voltage reference, which are responsible for comparing the input voltage from the power supply with the preset voltage value, and producing the active low reset signal.

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