BQ24251EVM-150

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Evaluation and demonstration boards and kits are important components in the electrical engineering field. They provide essential guidance, feedback, and hands-on experiences for various applications, such as circuit design development, lab testing, and product demonstrations. The BQ24251EVM-150 is a lithium-ion and lithium-polymer battery charger evaluation module that demonstrates the multifunction capabilities of TI\'s bq24251 charging device. The BQ24251EVM-150 has a variety of applications, including mobile phone, motorized scooter, digital camera, and other mobile power-based electronic devices.

The BQ24251EVM-150 integrates a 3.7V-VIO battery input voltage and I²C communications interface for user flexibility. It also has an integrated inductor and MOSFET switch for system protection and efficient operation. Additionally, the BQ24251EVM-150 provides constant current, constant voltage, and high-efficiency charging to recharge compatible battery packs.

The BQ24251EVM-150 is designed to meet the dual operating requirements of USB current-limiting and USB charging downstream port (CDP). It also supports USB fast charging for various adapters, including Apple and Huawei phones. The BQ24251EVM-150 features an integrated digital power monitor for direct battery voltage and current measures. Furthermore, the BQ24251EVM-150 has an internal temperature sensor for temperature protection of the battery and charger.

The working principle of the BQ24251EVM-150 is based on the interaction between the MOSFET switch and voltage and current loop control. The voltage is set by the voltage detection IC, and the current is measured by connecting the PMOS with low on-resistance into the input source. The resistor network on the bq24251 is used to sense current into the load, a constant current loop regulator (CCLR), which constantly reads the current that flows through the input, and controls the switch switching frequency though an analog voltage regulator. The bq24251 also contains an inductor with resistance to current changes and voltage measurements to detect the voltage on the battery quickly.

When both the input current and voltage are within acceptable limits, and the internal temperature sensor is within the specified temperature range, the bq24251 will regulate the current and voltage within the set limits and switch off the PMOS. The voltage across the inductor is then used to calculate the current in the output. Once the battery current reaches its regulated constant value, then the charger will switch off the MOSFET and allow the battery to discharge without overcharging it. The bq24251 will also monitor the cell temperature to ensure a maintained safe charging environment.

The BQ24251EVM-150 is an excellent evaluation module that provides users with a comprehensive platform to experiment with different charging schemes and charging power sources. It is suitable for a wide range of electronic device applications, such as mobile phones, motorized scooters, digital cameras, and much more. The integrated digital power monitor, voltage, and current measurements together with the internal temperature sensor provides the user with accurate and timely feedback information, enabling users to effectively and safely charge their battery packs.

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