BQ24901PWG4

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Battery chargers are an essential part of any PMIC system and are important for ensuring that the battery’s charge is maintained and power is delivered correctly

The BQ24901PWG4 is a switched-mode battery charger designed to charge a single lithium or lithium-ion cell. It integrates a full bridge MOSFET, current regulation, charge regulation, charge current, and charge termination. The charger’s maximum output voltage is 4.2V and its input voltage range is 4.0V to 8.0V.

The BQ24901PWG4 is designed for applications that require a simple and reliable solution for charging single and series stacked batteries, such as smartphones, digital cameras and game consoles.

The BQ24901PWG4 contains two key components, the current control and the charge control. The current control comprises of a PWM-controlled switch, which is used to regulate the flow of charge into the battery. The charge control comprises of a comparator that decides the end of charge condition. It also contains the Charge Control Mode (CC) pin, which provides the flexibility to select either a constant current or constant voltage charging. When CC pin is set to high, the battery charger will charge the battery to the pre-specified voltage, while in low condition, the charger will charge the battery to the pre-specified current.

The BQ24901PWG4 has a wide selection of protection options, such as short circuit protection, overvoltage protection and thermal shutdown capability. It also features input power limiting, allowing the user to select a safe level of input current limiting to prevent damage to the system. There are also two analog pins, which allows for charging current, charging voltage, and charge enable signals to be applied.

The BQ24901PWG4 is an ideal solution for multi-cell battery charging applications such as remote controls and medical devices. It runs from a wide input voltage range and has a low power operation, making it an ideal choice for battery charging in portable applications.

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