MAX6464UR23+T

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The MAX6464UR23+T is a low-power supervisor designed specifically to supervise the power-on and power-down sequences of battery-powered systems. It reduces the design workload by performing multiple start-up and shutdown functions desired in a modern mobile device. It is categorized as a Power Management Integrated Circuit (PMIC) - Supervisors, providing constant power reset boolean output and single-channel power ok flag. This article explores the application field and working principle of the MAX6464UR23+T PMIC - Supervisor.

Application Fields

The MAX6464UR23+T carries several features and characteristics which open up a range of applications for the device. This PMIC - Supervisor is the ideal choice for any mobile device which requires power-on and power-down sequencing, such as those found in mobile phones, tablet PCs, laptops, and automotive applications. It ensures that the device is correctly powered on and shuts down without any interruption. It also ensures optimal power consumption on devices with multiple power supplies.

This device is fully compliant to all of the stringent requirements compliant for mobile devices and was designed for low power consumption and small footprint. Moreover, its accurate internal voltage reference, user adjustable reset timer, three-stage power-fail detection, and an internal slow start circuit protect power supplies from inrush current and over-voltage. All these features make the MAX6464UR23+T PMIC – Supervisor suitable for many mobile applications.

Working Principle

At start up, the MAX6464UR23+T PMIC – Supervisor generates a true reset when the power supply voltage crosses an internally set threshold. The threshold is set by the user and can be set in the range of 0.6V to 3.9V. The reset generated is NOT latched, and once the voltage reaches the preset value, the reset is reset. At power-down, the PMIC - Supervisor supplies a falling edge of RESET in order to shut down the processor.

The PMIC - Supervisor also provides a power-fail warning threshold which provides a three-stage system for advanced warning of an imminent power failure. Additionally, the device’s precision internal voltage reference allows for a more accurate reset threshold and power-fail warning digital filter, which prevents false reset generation from either noise or unexpected power surge.

The PMIC – Supervisor has a user-specified RESET timer which re-arms the device after the RESET is generated. This timer period can be set in the range of 1ms to 1.5s and is designed to ensure that the reset handler has enough time to complete the shutdown/boot-up sequence.

The device also features an internal slow start circuit which prevents inrush current on start-up. This assists the overall power management of the device by reducing the start-up current and extending the battery life. Furthermore, the device includes a power-on detection flag which indicates when the total voltage has reached the set threshold.

Conclusion

The MAX6464UR23+T PMIC – Supervisors provides a number of features and characteristics which make it the ideal choice for power-on and power-down sequencing in mobile devices. Its accurate internal voltage reference, user adjustable reset timer, three-stage power-fail detection, and an internal slow start circuit allow it to accurately sequence the power-on/power-off of the device, while its low-power consumption allows for prolonged battery life. This PMIC – Supervisor is specifically tailored for use in mobile systems, and offers a number of advantages to the manufacturers of such systems.

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