BQ24005PWPRG4

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BQ24005PWPRG4 is a high-efficiency, integrated 750 mA Li-Ion linear charger. It is mainly used for a variety of mobile phones, digital cameras, and other portable devices powered by lithium-ion or lithium-polymer batteries. As an important member of PMIC - Battery Chargers, BQ24005PWPRG4 combines over-charging, over-discharging, and current/voltage regulation functions into a single chip. This makes it an ideal choice for most portable applications.

BQ24005PWPRG4 is a highly integrated battery charger that is used mainly for charging one series Li-Ion/Li-Polymer battery with constant current/constant voltage (CC/CV) algorithm. It supports up to 750mA of fast current charging and built-in battery temperature sensor allows automatic charging cutoff through advancing the charge rate in order to maintain battery health. It features various protection functions, such as over-charging, over-discharge, over-voltage protection, and short-circuit protection. This ensures that the battery won\'t get damaged during the charging process.

The BQ24005PWPRG4 consists of three main functional blocks: the battery charger, the power-on reset circuit, and the power management block. The charger block charges an external Li-Ion/Li-Polymer battery with constant current/constant voltage (CC/CV) algorithm. It also features input current limiting and thermal regulation. The power-on reset circuit is used to monitor the input supply and the output voltage. It also provides the power-on reset of the IC when the input voltage transitions from below to above the under-voltage lockout (UVLO) threshold. The power management block provides power-on reset detection and reset release with no external pins. It also provides overheat protection and UVLO protection with adjustable threshold.

The working principle of BQ24005PWPRG4 is fairly simple. When the battery voltage is below the pre-set charge voltage threshold, the charging current is set to the configured maximum, and the charger chip will start charging the battery with constant current. Once the battery voltage rises above the pre-set charge voltage threshold, the charger chip will switch to constant voltage charging, and the voltage will remain stable. The charger will then reduce the charge current automatically until the Charge Termination Current (CTC) threshold is reached, and will then transition to a trickle-charge pulse mode. Once the battery is fully charged, the charger chip will switch to the standby mode, shutting down all the circuitry until the Standby Current Enable (SCE) is triggered.

In conclusion, BQ24005PWPRG4 is a high-integrated, energy-efficient lithium-ion/lithium-polymer battery charger integrated circuit. It is packed with protection features and high-accuracy with excellent load and line regulation. It also provides overheat protection and short-circuit protection to prevent battery damages. Moreover, it is simple to use, and offers a cost-effective charging solution for power-critical applications.

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