ADM708RAR

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PMIC - Supervisors: ADM708RAR application field and working principle

Power Management Integrated Circuits (PMICs) are ubiquitous in electronics designs. They are the key component of the power supply architecture, maintaining the power rails and microprocessor logic core voltages within their specified operating levels and protecting them from damage due to overloads and short-circuits. Supervisory circuits enhance power management in two distinct ways. Firstly, they help maintain the power rail voltages by minimizing the effects of transients caused by switching activity elsewhere in the design. Secondly, they function as a form of overvoltage protection, reducing the risk of single points of failure in the design.

The ADM708RAR is a PMIC supervisor device designed specifically to control output voltage levels and provide overvoltage protection. It simulates a zener diode clamp and regulates output voltages to specifically-defined levels. This device interfaces with the system’s power supply to protect circuits against overvoltage conditions and monitor power rail levels. The ADM708RAR is a single-channel device and has an internal voltage reference ranging from 1.225 to 5.0V, making it suitable for a wide variety of applications.

Applications

The ADM708RAR is well suited for modern processor-based systems, where it is used to protect the processor from high voltage levels. It is also used in automotive applications, where it is incorporated into on-board battery management systems to ensure stable voltage levels and protect the battery from overcharging or over-discharging. Because of its small size, the ADM708RAR can also be used in mobile devices, where its overvoltage protection capabilities are beneficial to mobile devices powered by a single cell Li-Ion/Li-Polymer battery.

Working Principle

The ADM708RAR is designed to provide overvoltage protection and control power rail output voltages. It senses the input voltage and downsizes it to a level that can be used by downstream circuits. The output voltage is controlled by the precision voltage reference of the device, which is set to a voltage level off the scale of the external bit-setting resistor string or VRG pin. An external RC network slows the rise and fall times of the reference voltage, improving noise immunity.

The ADM708RAR also incorporates two low-power LED indicators for warning users of an overvoltage fault. The comparator is used to compare the reference voltage to the input voltage and when the two voltages differ by more than 2.8V, the fault LED is illuminated. This indicates the presence of an overvoltage condition and alerts users to take corrective action.

The ADM708RAR also provides accurate feedback on the position of the voltage raise/fall thresholds. The device outputs a digital signal that is clocked out on the QA output pin, informing downstream circuits whether a low or high threshold has been passed. This helps system-level designs determine the position of the voltage levels and take appropriate actions based on the signal.

Conclusion

The ADM708RAR is a single-channel, PMIC supervisor device designed to protect downstream circuits from overvoltage conditions and accurately control power rail output voltages. It can be used in a variety of applications, from processor-based systems to automotive battery management and mobile devices. With its precise reference voltage and low-power LED fault indicators, the ADM708RAR is an ideal choice for modern power management designs.

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