The bq24040 series is a highly integrated linear charger designed for lithium-ion batteries in compact, portable applications. It can be powered directly from a USB port or an AC adapter, making it ideal for devices where space is limited. The device supports a wide input voltage range and includes overvoltage protection, allowing the use of cost-effective, unregulated power adapters.
The bq24040 provides a single output for both battery charging and system power. If the system load remains below the level that keeps the battery fully charged, the safety timer can be set to 10 hours, ensuring safe operation even when the battery is not continuously being charged.
**Key Features**
**Charging**
- ±1% charging voltage accuracy
- ±10% charge current accuracy
- Supports USB input current limits of 100mA or 500mA via pin selection
- Programmable charge termination voltage and precharge current limit
- High-voltage support (3.45V) available with the bq24045
**Protection**
- Input overvoltage protection at 6.6V or 7.1V, with a maximum of 30V
- Dynamic power management for input voltage
- Thermal protection at 125°C (management) and 150°C (shutdown)
- Short-circuit protection for both the OUT and ISET pins
- Compliance with JEITA standards, with optimized charging rates in both cold and hot conditions (4.06V at high temperatures)
- A fixed 10-hour safety timer is included in both the bq24040 and bq24045
**System**
- Automatic charge termination and timer mode for battery packs without thermistors
- Status indication for charging and completion
- Available in a compact 2x2mm DFN-10 package
- Integrated automatic start function for production line testing, available in the bq24041
This device is well-suited for a wide range of portable electronics, offering reliable performance, robust protection, and flexible configuration options. Whether you're designing a handheld device or a small embedded system, the bq24040 series delivers efficient and safe battery charging in a minimal footprint.
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GuangZhou HanFong New Energy Technology Co. , Ltd. , https://www.gzinverter.com