ADM8699AN

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Power management IC (PMIC) supervisors, also called power supply supervisors, are dedicated circuits that monitor the status of a system\'s power supply. Among them, ADM8699AN is a PMIC designed specifically to monitor the status of single-cell Li-ion/Li-polymer rechargeable batteries. This article explores the application fields and working principles of the ADM8699AN.

Application Fields for the ADM8699AN

The ADM8699AN is a complete, programmable power supply supervisor for single-cell Li-ion/Li-polymer rechargeable batteries. It is widely used in many fields, such as in smartphones, tablets, portable media players, digital cameras, global positioning systems (GPS),and other handheld applications. It can also be used as an external charger for single cell Li-ion/Li-polymer battery packs. This device offers many features that are designed to protect the system during battery charging and discharging.

The ADM8699AN also provides various current sensing and power sequencing capabilities. It supports cell-balancing and temperature monitoring for single cell Li-ion/Li-polymer batteries. In addition, it also provides support for adjustable system reset signals, programmable delay timers, adjustable current thresholds, and adjustable voltage thresholds. Furthermore, it also has integrated voltage and current sensing circuitry, as well as programmable pull-up/pull-down resistors.

Working Principles of the ADM8699AN

The ADM8699AN is a programmable power supply supervisor with various features and capabilities. It provides robust power management and system protection, as well as cell-balancing and temperature monitoring. Furthermore, it also provides adjustable system reset signals, programmable delay timers, adjustable current thresholds, and adjustable voltage thresholds.

The working principle of the ADM8699AN can be divided into two parts. The first is the power control, which is responsible for the control of charge and discharge of the Li-ion/Li-polymer rechargeable battery. This is achieved through two power supplies: a VDD_HI & VDD_LO. The VDD_HI power supply is connected to the battery when it is charged, and the VDD_LO is connected when it is discharged. The ADM8699AN can sense the voltage on the VDD_HI and VDD_LO supplies and determine whether the battery is charging or not. If the voltage across the two power supplies is lower than a certain threshold, it will then reset the system.

The second part of the ADM8699AN\'s working principle is the power sequencing. Power sequencing is responsible for the control of all internal and external devices connected to the Li-ion/Li-polymer rechargeable battery. These devices include the Li-ion/Li-polymer battery cells and the functional blocks, such as the voltage monitoring, current monitoring, temperature monitoring, cell balancer, and sequence controller. For each of these devices to function properly, it must be powered in the correct order, and the ADM8699AN ensures that all devices are powered in the right sequence.

The ADM8699AN also includes several optional features, such as adjustable system reset signals, adjustable current and voltage thresholds, and programmable pull-up/pull-down resistors. These features provide the flexibility and versatility needed for different application requirements.

Conclusion

The ADM8699AN is a highly programmable power supply supervisor for single-cell Li-ion/Li-polymer rechargeable batteries. It is widely used in a variety of fields, such as smartphones, tablets, portable media players, digital cameras, GPS devices, and other handheld applications. The working principle of the ADM8699AN is divided into two parts, power control and power sequencing. It also provides several optional features that provide the flexibility and versatility needed for various application requirements.

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