1 FeaturesCharging 1% Charge Voltage Accuracy 10% Charge Current Accuracy Pin Selectable USB 100mA and 500mA Maximum Input Current Limit Programmable Termination and Precharge Thresholds, BQ24040 and BQ24045 The BQ24045 supports high voltage (4.)35V) Battery chemistry Protects 30V input rated voltage;With 66v or 71V Input Overvoltage Protection Input Voltage Dynamic Power Management 125°C Thermal Regulation150°C Thermal Shutdown Protection OUT Short Circuit Protection and ISET Short Circuit Detection Operates in the JEITA range via battery NTC 1 2 fast charge current in cold state and 4 in hot state06V, BQ24040 and BQ24045 Fixed 10-Hour Safety Timer, BQ24040 and BQ24045 Systems Auto-Terminate and Timer Disable Mode (TTDM) for Missing Battery Packs with Thermistor, BQ24040 and BQ24045 Status Indication Charge & Finish Available in a Small 2mm 2mm2 DFN-10 Package Integrated auto-start for production line testing, BQ24041 Functional Safety (BQ24040) Documentation for functional safety system design is available Safety-related certifications: IEC 62368-1 CB certification (BQ24040, BQ24045).
2 ApplicationsTWS Headsets & Headphones Smartwatches & Wristbands Wireless Speakers Mobile POS Portable Medical Devices.
3 InstructionsThe BQ2404X family of devices is a highly integrated Li-Ion and Li-Polymer linear charger device for space-constrained, portable applications. The device is powered by a USB port or an AC adapter. The high input voltage range and input overvoltage protection enable low-cost, unregulated adapters. The BQ2404X has a single-supply output to charge the battery. If the average system load does not allow the battery to be fully charged during the 10-hour safety timer period, the system load can be paralleled with the battery. Battery charging goes through three stages: regulation, constant current, and constant voltage. During all charging phases, the internal control loop monitors the IC junction temperature, which reduces the charging current when it exceeds the internal temperature threshold. The charger power stage and charge current sensing are fully integrated. The charger features high-precision current and voltage regulation loops, charge status display, and charge termination functions. The pre-charge current and termination current thresholds are programmed with external resistors on the BQ24040 and BQ24045. The fast-charge current value can also be programmed with an external resistor.