BQ24001EVM

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Evaluation and Demonstration Boards and Kits are widely used for developing and testing of various electronic devices. The BQ24001EVM board is such an Evaluation and Demonstration Board based on the BQ24001 device which is a high-efficiency synchronous buck mode Switching Charger. The BQ24001EVM implements the power-transfer charging and discharge feature of the BQ24001 device.

The BQ24001EVM application field is ideal for fast charging and simultaneous discharging of Li-Ion or Li-Polymer rechargeable batteries, as well as AC adapter based applications such as USB and other portable chargers. It can also be used for implementing a fast charger for USB OTG charging applications. The BQ24001EVM board is designed to supply 5 V and 0.5 A maximum from an input source to a rechargeable battery.

The working principle of the BQ24001EVM board is based on the operation of the BQ24001 device. It consists of a single PFM/PWM controller and two switches. The PFM/PWM controller regulates an input voltage with a range of 4.5 V to 24 V and provides a 5 V output. The controller controls the voltage, current, and temperature of the rechargeable battery by adjusting the duty cycle of the two switches which operate in the buck topology. When the battery voltage is low, the two switches switch on and off in unison to provide the output current. When the battery voltage increases, the switches switch off periodically to maintain the output voltage.

The BQ24001EVM board also features some protection features such as overcurrent, thermal shutdown, short circuit and battery low voltage lockout. It provides the necessary flexibility to the application developer to configure the functional blocks optimized for a wide range of battery and other system types. The BQ24001EVM also comes with an LCD display and LEDs to provide user information about the status of the charge/discharge cycle.

In summary, the BQ24001EVM is a powerful evaluation and demonstration board which can be used to develop and test applications related to the fast charging and simultaneous discharging of Li-Ion or Li-Polymer rechargeable batteries, as well as AC adapter based applications such as USB and other portable chargers. The BQ24001EVM board has several protection features along with an LCD display and LEDs to provide user information. The board is based on the operation of the BQ24001 device which consists of a single PFM/PWM controller and two switches which operate in the buck topology.

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