MAX6421XS22+

Series:	--
Packaging:	Cut Strip
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active Low
Reset Timeout:	Adjustable/Selectable
Voltage - Threshold:	2.188V
Operating Temperature:	-40°C ~ 125°C (TA)
Mounting Type:	Surface Mount
Package / Case:	SC-82A, SOT-343
Supplier Device Package:	SC-70-4

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Introduction:
The MAX6421XS22+ is a current-monitoring power supervisor that is designed for use in electronics applications that require a high degree of electrical isolation. The MAX6421XS22+ has an integrated comparator and current sense resistor that sense the current flowing in the system, allowing automated triggering of protective functions. The MAX6421XS22+ can be used as a monitoring circuit in power supplies, electric motors, electric pumps, solenoids, and electric fans,Application Field:
The MAX6421XS22+ is ideal for applications that require a high degree of current monitoring and protection in power supplies, electric motors, electric pumps, solenoids, and electric fans. When used in motors and pumps, it can sense the current that is flowing in the system and trigger protective functions when the current reaches a predetermined limit. In addition, it can also be used in devices with limited temperature or humidity ranges, as it can sense temperature changes and generate interrupts when the environment reaches pre-defined thresholds. The MAX6421XS22+ is also commonly used for sequentially starting multiple circuits. This is particularly useful for devices that require a large amount of power, such as elevators or factory automation systems, as it can reduce the power surge within the circuit and prevent overloads from occuring.Working Principle:
The MAX6421XS22+ works by sensing the current within a system and sending interrupts to the connected electronics when an overcurrent or undercurrent threshold is met. This is accomplished by integrating a comparator, which is connected to an internal current sense Resistor (CSR). When the current passes through the CSR, it generates a voltage that is proportional to the current, and this voltage is then compared to the threshold voltage of the comparator. If the voltage falls outside of the specified threshold, then an interrupt is sent, allowing the connected electronics to take corrective action and protect the system from potential damage.The MAX6421XS22+ can also be used to start multiple circuits in a sequential manner, known as Soft Start. This is accomplished by setting the overcurrent or undercurrent limits for each circuit based on the total power required by the system. When the total current exceeds the preset limit, the device will send an interrupt, and then each of the circuits can be sequentially powered up to prevent overloads, thereby reducing the power surge within the system.Conclusion:
The MAX6421XS22+ is a powerful current-monitoring and protection solution that is designed for use in electronics applications that require a high degree of isolation. It has many applications, such as motors and pumps, temperature sensors, sequentially starting multiple circuits, and many other industrial uses. The MAX6421XS22+ works by integrating a comparator and current sense resistor, allowing it to sense the current within the system and trigger protective functions when necessary.

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