ISL95857AIRTZ

Introduction

The ISL95857AIRTZ is a high voltage monolithic cylindrical lithium-ion battery charger designed for use in next-generation ultra-portable electronic devices. It is a linear current regulator for battery charging up to 4.2V, with low quiescent current and high efficiency. The ISL95857AIRTZ can be used in a variety of battery charging applications including smartphones, cameras, notebook computers, WatchOS, portable media players, and more. It is suitable for use with low power source environment.

Application Field

The ISL95857AIRTZ is a special purpose voltage regulator capable of charging a variety of battery chemistries including Li-ion and NiMH. It has very wide operating temperature range, making it ideal for use in harsh environments. The device can be used in small form factor applications, such as small cell phone chargers, and is also suitable for charging batteries in places with limited power sources. Additionally, it can also be used for automotive battery charging as well.

Working Principle

The ISL95857AIRTZ is designed to charge a battery using a linear constant current (LCC) technique. It implements a current limit and thermal control to ensure safe operation. The charge current is set through an external resistor network connected to the SET/DET pin. The device monitors the battery voltage and automatically terminates the charge cycle by dropping the charge current to zero when the battery reaches its full voltage. Additionally, the device includes a die temperature sensing circuit on the IC die for thermal protection.

Conclusion

The ISL95857AIRTZ is a special purpose voltage regulator designed for use in next-generation ultra-portable electronic devices. It is capable of charging a variety of battery chemistries efficiently and safely, making it an ideal choice for use in small form factor applications. Furthermore, its wide operating temperature range and low quiescent current makes it ideal for use in harsh environments and for automotive applications.

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