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Single Cell Li-Ion and Li-Pol Battery Charger With Auto Start

 2015-03-25

【基本資料】

【產品特性】

BQ24040/45/50 – 1000mA Linear Charger in 2x2 QFN with USB D+ D- Detection
1. 30V input rating with input OVP
2. Input voltage dynamic power management
3. Selectable 100mA or 500mA USB current limit
4. Adjustable pre-charge and termination current
5. Supports 4.35V battery charging (bq24045)
6. Fast charge current programmable 50-800mA
7. 4.4V Vin-dpm threshold in USB mode, 4.3V in adapter mode
8. 4.2V battery regulation voltage, 4.06V when pack temperature>45degreeC
9. Thermal regulation at 125degreeC IC junction temperature
10. Fixed 10 hour timer
11. Available in Small 2×2mm2 DFN-10 Package

【產品應用】

 Smart Phones
 PDAs
 MP3 Players
 Low-Power Handheld Devices

【文字介紹】

The bq2404x series of devices are highly integrated Li-Ion and Li-Pol linear chargers devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.

The bq2404x has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10 hour safety timer.

The battery is charged in three phases: conditioning, constant current and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination. The pre-charge current and termination current threshold are programmed via an external resistor on the bq24040 and bq24045. The fast charge current value is also programmable via an external resistor.