The bq24040 series is a highly integrated lithium-ion battery linear charger designed for space-constrained portable applications. It can operate from either a USB port or an AC adapter, offering flexibility and ease of use. The device supports a wide input voltage range with overvoltage protection, making it compatible with low-cost, unregulated adapters.
The bq24040 provides a single-output charging solution, where the battery is charged while the system load draws power. As long as the average system load doesn't keep the battery fully charged, the safety timer can be set to 10 hours, ensuring safe operation even in extended charging scenarios.
**Key Features**
**Charging**
- 1% charging voltage accuracy for precise charging
- 10% charge current accuracy for reliable performance
- USB input current limit options: 100mA or 500mA (selectable via pin)
- Programmable charge cutoff voltage and precharge current limit
- High-voltage support (3.45V) via the bq24045 variant
**Protection**
- 30V input level and 6.6V/7.1V overvoltage protection for enhanced safety
- Input voltage dynamic power management for efficient energy usage
- Thermal protection at 125°C and shutdown at 150°C for safe operation under stress
- Short-circuit protection on both the OUT and ISET pins
- Compliance with JEITA standards, with optimized charging currents for cold (1/2 speed) and hot conditions (4.06V), supported by both bq24040 and bq24045
- Fixed 10-hour safety timer for added reliability
**System**
- Automatic charge termination and timer mode for battery packs without thermistors (bq24040 and bq24045)
- Status indication for charging and termination
- Compact 2x2mm DFN-10 package for space-efficient designs
- Integrated automatic start function for production line testing (available in bq24041)
These features make the bq24040 series ideal for a wide range of portable devices, from handheld electronics to wearable technology, offering a balance of performance, safety, and integration.
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GuangZhou HanFong New Energy Technology Co. , Ltd. , https://www.gzinverter.com