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PMIC - Supervisors

The MAX817LCPA+ is a cost-effective, precision, low-dropout voltage supervisor circuit that provides a low supply-current reset generation to guarantee reset of the system circuitry upon power-on and supply fault. Additionally, the supervisor includes two other independent, fixed-voltage Power-Fail Comparators to enable system shutdown upon power failure, as needed. The MAX817LCPA+ provides separate push-pull RESET and Power-Fail outputs, and it runs off a single low supply voltage and can source a minimum of 40mA current. The device offers thermal protection, wide range of reset threshold voltages, and offers the convenience of manual reset and power-fail test-pin features.

Application Field of the MAX817LCPA+

The MAX817LCPA+ is commonly considered for use in system level communications, HVAC and industrial applications, which could involve anything from the use of batteries, motor control devices, switches, digital systems, computers, and so forth. It is beneficial in preventing system malfunction when there are sudden changes in provided power, such as a surge or drop-out. Its ability to control the voltage is one of its most attractive traits in that it can maintain the system\'s reliability by providing a consistent source of power.

Furthermore, when detecting errors, the MAX817LCPA+ can provide an accurate assessment of the input supplied to the circuit, thus identifying and rectifying power supply disturbances. This is especially advantageous when dealing with equipment and products that require accuracy for proper and safe operation.

The application field of the MAX817LCPA+ is not limited to any specific industry and ideally can be used in any product that requires maintenance of a consistent power supply, as well as detection of a wide range of errors.

Working Principle of the MAX817LCPA+

The MAX817LCPA+ supervisor is a low supply-current reset generator that provides a low supply-current reset generation. It has an active low Reset output and an active high Power-Fail output. The device runs off of a single low supply voltage and is able to source a minimum of 40mA current. The MAX817LCPA+ has a voltage reference setting which is determined by the voltage applied between the VREF and VCC pins. The device also has an adjustable hysteresis whose level is determined by the voltage applied between the IHYS and GND pins.

When the voltage of VCC is higher than the voltage of VREF, reset is asserted. When the voltage of VCC is lower than the voltage of VREF plus the hysteresis voltage, reset will be deasserted. This is the operating principle of the supervisor. It is important to note that the reset timing specifications are dependent on the application\'s power supply, reset threshold voltage, and hysteresis voltage.

The Power-Fail comparator of the MAX817LCPA+ is another critical component which is used for system shutdown in the event of power failure. The Power-Fail output goes high when the voltage of VDD is lower than the voltage applied to the PFI pin. In addition, the device features a manual reset function. When the MR pin is pulled high to VCC, the Low Reset Output goes active with a RESET active width of 1 ms minimum.

Conclusion

The MAX817LCPA+ is a cost-effective and precision-oriented low-dropout voltage supervisor circuit that can address system level communication, HVAC and industrial requirements with its reset generation, power-fail comparator mechanism, and manual reset feature. With its single low-supply voltage requirements, 40mA minimum source current, and adjustable hysteresis setting, the MAX817LCPA+ offers a reliable parameters monitoring solution for a wide range of applications.

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