Characteristic parameters and charging circuit of the power management chip bq24040 Chinese information

　　The bq24040 series of devices are highly integrated lithium-ion battery linear chargers targeted at space-constrained portable applications. The device operates from either the USB port or the AC adapter. High input voltage range input overvoltage protection supports low-cost unregulated adapters.

　　The bq24040 has a single output power for battery charging. System Load As long as the average system load does not keep the battery fully charged the 10 hour safety timer can be placed in parallel with the battery.

　　Characteristic parameters charging

　　1% charging voltage accuracy

　　10% charging current accuracy

　　USB maximum input current limit for pin selection (100mA and 500mA)

　　Programmable charge cutoff point and precharge current limit

　　High voltage (3.45V) chemical support via bq24045

　　Protect

　　30V input level; 6.6V or 7.1V input overvoltage protection

　　Input voltage dynamic power management

　　125 degrees Celsius thermal management; 150 degrees Celsius thermal shutdown protection

　　OUT pin output short circuit protection and ISET pin short circuit protection

　　Operates over the JEITA range through battery negative temperature coefficient -1/2 fastest charge current when cold, 4.06V when hot, bq24040 and bq24045

　　Fixed 10-hour safety timer, bq24040 and bq24045

　　system

　　Automatic disabling charge termination and timer modes for battery packages without thermistor, bq24040 and bq24045

　　Status indication, charging/end

　　Can be packaged in 2*2mmDFN-10

　　Integrated auto-start function for production line testing, bq24041

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