ISL9205AIRZ-T

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The ISL9205AIRZ-T is a high-efficiency, dual-channel, buck-boost battery charger with integrated power MOSFETs. It is suitable for multiple-source power supplies, such as USB-PD, wall adapters, and batteries. It allows the use of a single charger to support multiple power sources and provides a complete battery charging solution for most consumer applications.

This battery charger generally is used in power management applications, such as phones, tablets, wearables, and IoT devices. It supports a wide range of single, dual, or triple cells, from 0.5V to 5.5V. Further, the charger provides adjustable output current regulation, independent control of charging current, driven reverse discharge prevention, thermal monitor and short-circuit protection, and more.

Working Principle

The ISL9205AIRZ-T is an integrated circuit (IC) which can accept input from different power supply sources and then charge the connected battery. It is a buck-boost regulator, which allows different input voltages to be converted constantly to a desired output voltage. The buck-boost regulator converts a higher voltage to a lower voltage, and a lower voltage to a higher voltage. It is integrated with two power MOSFETs, and the connection between them is made using logic pins. The charger intelligently switches between buck and boost modes, and it can support cell voltages from 0.5V to 5.5V. The integrated power management unit (PMU) controls the charging states, and the integrated monitor measure the output voltage and temperature of the charger.

The charging process consists of several stages. First, the charger starts off in the pre-charge stage, where it checks the battery voltage and activates the power MOSFETs. During the pre-charge stage, the charger slowly begins to charge the battery with current limited to a safe level to prevent any damage. After the battery voltage exceeds a certain minimum level, the charger enters the constant-current (CC) stage. During this stage, the charger keeps the output current constant, and it increases the battery voltage until the battery is fully charged or the battery temperature exceeds a certain limit.

Once the battery is full, the charger enters a maintenance stage, where it continues to keep the battery charged but at a lower current. If the battery voltage drops below a certain level, the charger restarts the constant-current stage and brings the battery voltage back to its maximum level. Furthermore, the charger also maintains an adjustable regulation voltage to protect the battery from overcharging. Finally, the charger can enter the reverse discharge mode to prevent battery voltage from dropping below a certain threshold.

Conclusion

The ISL9205AIRZ-T is a dual-channel buck-boost battery charger intended for multiple-source power supplies. It supports a wide range of cell voltages and integrates with two power MOSFETs. It features adjustable output current regulation, independent control of charging current, driven reverse discharge prevention, thermal monitoring and short-circuit protection. It is typically used in power management applications such as phones, tablets, wearables, and IoT devices.

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