ADM708TAN

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Power-management integrated circuits (PMICs) perform a critical role in providing reliable, energy-efficient power to modern electronic systems. PMICs must foresee potential power supply problems and respond efficiently and appropriately to these problems. Supervisors are commonly found within PMICs and are responsible for watching over the power rails of a system. They can detect when the input or output voltages become too high or too low, providing a mechanism of ensuring the secure operation of the system. The ADM708TAN is an example of a supervisor IC capable of serving as a failsafe within consumer electronic systems. This article discusses the application field and working principle of the ADM708TAN.

Application Field

The ADM708TAN can be used in a wide variety of consumer electronic systems, including those involving cellular phones, digital cameras, portable gaming, and automotive applications. Additionally, the ADM708TAN can be employed within notebooks, tablet PCs, and PDAs. All of these systems are generally powered by either a single cell or a dual cell lithium-ion battery, and the ADM708TAN offers robust protection against overcharging and reverse charging in these systems. The ADM708TAN also features low quiescent current draw, allowing for longer battery life in these devices.

Working Principle

The ADM708TAN measures input or output voltages on the power rail and triggers an alert if the voltage reaches either a high or low threshold. Specifically, the threshold voltage is programmable, allowing it to be set to a precise level to accommodate changing operational conditions. The alert itself is either an output signal or reset signal that triggers an appropriate response from the system.

The ADM708TAN is equipped with two distinct circuits that enable it to accurately monitor power-line voltages. These circuits are a voltage detector and a voltage reference. The voltage detector monitors the input or output voltage on the power rail and compares it to the voltage reference. If the voltage exceeds the specified limit, then the detector will trigger an alert. The voltage reference is adjustable, allowing the device to be calibrated for the precise system requirements.

Additionally, the ADM708TAN supports a variety of power-down modes. This allows for the device to be powered off during periods of inactivity, saving energy in the process. It also allows for the ADM708TAN to remain active during standby, allowing it to respond quickly when the system requires power again.

The ADM708TAN also provides overcurrent protection. It monitors the current on the power rail and will shut off the power if the current reaches beyond a certain limit. This feature prevents overloads, which could potentially damage components within the system, and also guards against component misconfiguration.

The ADM708TAN also supports soft-start operation. This enables the IC to slowly bring up the power rail voltage when powering on the system, avoiding potential inrush issues, and reduces stress on the power components. This feature is especially important for devices that use a single cell lithium-ion battery, since these batteries can have a high inrush current on power-up.

Conclusion

The ADM708TAN is a supervisor IC from Analog Devices that can be used in a variety of consumer electronic applications. It is designed to measure the voltage of a power rail and trigger an alert if either the input or output voltage exceeds a specified threshold. Additionally, the ADM708TAN also offers robust overcurrent protection and features various power-down modes for energy efficiency. Finally, the ADM708TAN supports soft-start operation, enabling it to reduce stress on power components when powering the system up and avoiding potential inrush issues.

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