BQ25895RTWR

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The BQ25895RTWR is a highly integrated, low cost programmable battery charging system designed to charge 3-cell Li-Ion and Li-Polymer battery packs. It is a feature-rich power management IC (PMIC) with battery-charging, power-distribution, sensing, and protection functions. This all-in-one solution makes the BQ25895RTWR ideal for space-constrained applications such as those found in consumer electronic devices. The BQ25895RTWR reduces BOM size and cost while providing high-power charging capabilities at up to 4A/cell.

The BQ25895RTWR datasheet outlines the device features and provides detailed information on the block diagrams and electrical characteristics. The BQ25895RTWR supports multiple charging profiles for different battery chemistries including LiFePO4, Li-Ion, and Li-Polymer. It supports Charge Termination based on Voltage, Time, and Charge Current thresholds with programmable hysterisis. The device also supports voltage regulation, AC/USB-detection outputs, and Reverse-Current Protection to conserve valuable battery capacity.

The BQ25895RTWR application field is battery management for consumer electronic devices such as smartphones, portable media players, tablets, and wearable devices. It can be used to charge single-cell and multi-cell battery packs of varying sizes and chemistries, making it suitable for a wide range of applications. In addition, the BQ25895RTWR\'s small form factor and high-power charging capability make it an ideal choice for space-constrained applications.

The working principle of the BQ25895RTWR is based on a four-stage constant current/constant voltage charging scheme. When the device is powered, it first initiates a pre-charge cycle to quickly charge a completely discharged battery. Once the battery reaches the pre-charge voltage level, the device initiates the Constant Current (CC) charging stage. During this stage, the BQ25895RTWR supplies a constant current to the battery. The device then transitions to the Constant Voltage (CV) stage where the battery is charged at a predetermined voltage. Finally, the device enters the trickle-charge stage where the charge current is reduced significantly to ensure that the battery does not overcharge.

The safety features of the BQ25895RTWR provide additional protection against fault conditions. The device contains several monitoring systems that monitor the battery voltage, temperature, and charge/discharge current. It also includes overvoltage, undervoltage, over-temperature, and over-current protection. In the event of a fault condition, the device will shut down, preventing damage to the battery or host device.

The BQ25895RTWR is a highly integrated, low cost PMIC that offers a flexible, feature-rich charging solution for consumer electronic devices. Its four-stage charging scheme and safety features make it well suited for charging 3-cell Li-Ion and Li-Polymer battery packs. It is a versatile solution that is suitable for a wide range of applications and is well-suited for space-constrained designs.

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