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PMIC - Battery Chargers: ISL6252HAZ-T application field and working principle

The ISL6252HAZ-T is a high performance, automotive-grade, dual-channel battery charger suitable for a wide range of vehicles to meet the latest charging requirements. This device integrates dual-channel constant current/constant voltage (CC/CV) linear battery chargers, two SYNC/STAT/POK switches, two power MOSFETs, two pulse width modulation (PWM) controllers, two current sense resistors, and multiple other features into a single, small package. The ISL6252HAZ-T is ideal for both lead-acid and Li-ion battery charging applications. This article provides an overview of the application field and working principle of the ISL6252HAZ-T.

Application Field

The ISL6252HAZ-T is designed to meet the strict requirements of the automotive, truck and heavy-duty markets. It is an ideal choice for dual-channel, CC/CV Battery Charger applications. The device is suitable for use in electric/hybrid systems, 12V/48V/400V vehicle battery chargers, portable power banks and motorcycle charging systems. The device combines a dual-channel charge controller, two power MOSFETs, two programmable PWM controllers, and an on-chip current sense resistor in a single package.

Working Principle

The ISL6252HAZ-T operates in three different modes: constant current (CC), constant voltage (CV), and standby. When in CC mode, the device supplies the battery with a constant current that is determined by an external current set resistor. When in CV mode, the device switches to constant voltage and begins current limiting, which ensures that the battery is protected from overvoltage. When in standby mode, the device is disabled and draws no current from the battery. The device also provides over-temperature protection, current limitation, reverse battery protection, and programmable under-voltage lockout and restart thresholds. The device also features programmable equivalent series resistance (ESR) compensation. This allows the device to accurately control the charge current and reduce high ESR battery drain. The device also features a switchable automatic Pulse Frequency Sharing (PFS) which allows it to dynamically adjust the charge current to ensure both channels are utilizing the same charging current.

Conclusion

The ISL6252HAZ-T is a high performance, automotive-grade, dual-channel, CC/CV linear battery charger. It is ideal for both lead-acid and Li-ion battery charging applications in electric/hybrid systems, 12V/48V/400V vehicle battery chargers, portable power banks, and motorcycle charging systems. The device features over-temperature protection, current limitation, reverse battery protection, and programmable under-voltage lockout and restart thresholds. Additionally, the device features programmable ESR compensation, PFS, and synchronous/status/power-on/off switches. These features make the ISL6252HAZ-T a top choice for dual-channel battery charging applications.

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