MAX6376UR22+T Integrated Circuits (ICs)

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Power management integrated circuits (PMICs) are essential components for most electronic applications. They provide efficient conversion between different power supply sources and voltage levels, as well as allow for precise power distribution and regulation. Supervisors, a subcategory of PMICs, are used for monitoring power and alerting the distribution circuit in the event of a fault. The MAX6376UR22+T is an example of a supervisor, and its application field and working principle are discussed in this article.

Application Field

The MAX6376UR22+T is a high-performance, low-noise supervisor designed to monitor battery power on portable systems with large 3-cell Li-ion battery packs. It combines adjustable undervoltage monitoring (UVLO) of all battery cells with a separate fast-response OVLO and temperature monitoring with a second selectable threshold. The supervisor also provides two high-sink output stages that can be used to DISABLE a system\'s power rails or initiate a system reset. This makes it ideal for use in systems with advanced power supply schematics and flexible power failure conditions.

Working Principle

The MAX6376UR22+T works by monitoring the voltage of each battery cell using an integrated analog-to-digital converter. Each cell is monitored at up to 10mV resolution, allowing for precise undervoltage monitoring (UVLO). When the voltage of any monitored cell drops below the programmed threshold, the supervisor immediately triggers one or both of its outputs. The OVLO pins will then shut off the system’s power rails if necessary to prevent overcharging of the batteries. The supervisor also monitors temperature, which can used to further protect the battery pack.

Once in shutdown mode, the supervisor will follow a pre-programmed power-on reset (POR) sequence to enable the system once again. If the detected fault was simply an undervoltage condition, the supervisor will monitor the cell voltages at regular intervals until all cells return within tolerance. If the fault was a temperature or overvoltage condition, the supervisor will wait until the temperature returns to a safe level before turning the system on again. This allows the supervisor to quickly protect the system from a wide range of conditions.

Conclusion

The MAX6376UR22+T is a versatile, high-performance supervisor designed to monitor battery power on portable systems with large Li-ion battery packs. It integrates UVLO, OVLO, and temperature monitoring, allowing it to quickly trigger its high-sink outputs and protect against a wide range of faults. Its integrated POR sequence also ensures that the system can safely recover and return to normal operation once the fault has cleared.

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