ISL95521BHRZ-T

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Introduction to PMIC - Battery Chargers

Power management integrated circuits (PMICs) are specialized pieces of hardware dedicated to providing a stable and reliable source of power. This can be achieved in a wide array of operating conditions from low-power wearables to high-power embedded processors. One such application is battery charging, a vital part of the power management chain ensuring that batteries are efficiently charged and discharged.Typically, a battery charger contains one or more power supply blocks, power switch/disconnect circuitry, charge pumps, safety and thermal management modules, and a processing core of some sort. Depending on the type of battery, configurability and associated charging protocol, the circuitry and functionality may vary.

ISL95521BHRZ-T – An Overview

The ISL95521BHRZ-T is a Li+/Li-ion battery charger PMIC from Intersil Corp. It is designed to charge single, dual and triple cell Li+/Li-ion battery configurations, and is suitable for a wide range of applications. It includes an integrated FET, configurable charge currents up to 2A, a wide input voltage range of 3V to 28V DC, and a thermistor input for temperature sensing. The device is capable of charging in multiple conditions including constant current/constant voltage mode, pre-charge mode, and fast-charge mode, with integrated protections like thermal-regulation, overvoltage and undervoltage protection, charge-termination, and reverse current protection.

ISL95521BHRZ-T – Application Field

The ISL95521BHRZ-T PMIC is designed specifically for Li+/Li-ion battery charging applications, and can charge batteries of different capacities or types. This makes it suitable for a wide range of applications such as laptop and power tools batteries, electric motor drives, UPS systems, automotive and industrial equipment, and other applications requiring constant charging.

ISL95521BHRZ-T – Working Principle

The ISL95521BHRZ-T PMIC uses a constant current/constant voltage (CC/CV) charging model. The device takes an input voltage from a source, boosts it to the desired voltage with an integrated FET, and then regulates the current to the battery to bring it up to its full capacity. The PMIC monitors the voltage and current of the battery and then adjusts its profile accordingly. During the charge cycle it holds a constant voltage, and reduces the current as the battery nears full capacity. It then switches to trickle-charge mode and monitors the battery voltage, switching off the FET when the target voltage has been reached.

Conclusion

The ISL95521BHRZ-T PMIC is a Li+/Li-ion battery charger that is highly configurable and suitable for a wide range of applications. It incorporates an integrated FET, a wide input voltage range, and supports multiple charging modes. In addition, it provides integrated protections and temperature sensing capabilities, providing a robust and reliable power supply solution. With its wide variety of applications and customizable profiles, the ISL95521BHRZ-T is an ideal choice for Li+/ Li-ion battery charging applications.

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