ISL95521AIRZ-T

PMIC - Battery Chargers

The ISL95521AIRZ-T is a highly integrated battery charger designed primarily to address the needs of various portable applications. Technology advancements have allowed the integration of many independent circuitry functions and components into the ISL95521AIRZ-T chip, resulting in a high performance and very efficient battery charger circuit. In some scenarios, the charger can even be used as the only power source for the device. The ISL95521AIRZ-T is designed to accept a wide range of input sources and to allow maximum power throughput while also meeting tight requirements for system efficiency.

Application Field

The ISL95521AIRZ-T is relevant for a variety of applications in the field of power management and battery charging. It can be used for battery charging in all kinds of portable devices and embedded systems, for back-up power, for powering LEDs and for monitoring battery health. It can also be used to provide power conditioning for low power systems by providing both a constant regulated output and a regulated battery charging current.

Working Principle

The operation of the ISL95521AIRZ-T is based on a switched-mode power-conversion technology. This allows the charger to efficiently manage power through the various stages of the charging process. The charger begins with a pulse width modulation (PWM) phase to determine the input power source and to condition the power before applying it to the battery. The ISL95521AIRZ-T then enters a constant-voltage (CV) phase, during which the output voltage is regulated to the desired charging voltage. In the constant-current (CC) phase, the charger regulates the output current to the desired charging current. Finally, the charger enters a safety-timer phase which monitors the temperature of the battery and terminates charging if the temperature exceeds the predetermined thresholds.

The ISL95521AIRZ-T also includes a number of protection features to ensure safe operation. The charger has an over-voltage protection (OVP) to protect against an overcharge of the battery, an over-current protection (OCP) to protect against a high current draw, and an overtemperature protection (OTP) to safeguard against excessive heating of the battery. The ISL95521AIRZ-T also features input voltage detection and shutdown, which ensures that the charger only operates with a safe input voltage.

Conclusion

The ISL95521AIRZ-T is a highly integrated battery charger designed to address the needs of portable applications. It is easy to use and offers high system efficiency, a wide range of input voltage sources, and a host of protection features to ensure safe operation. Its use of switching technology allows for efficient power management throughout the charging process and a regulated output for reliable performance.