资 源 简 介
The ISL9221 Lithium Ion charging IC is designed to meet the charging requirements of most of today’s handheld devices.The IC provides two inputs for either USB connecTIon wherethe current is limited by the USB standard or forpowering/charging from a power adapter.If the voltage at either VUSB or VDC pin is within the safeallowable range, the PPR pin is pulled low indicaTIng to thesystem processor that external power is available.Charging can be enabled/disabled by controlling the state ofthe EN pin. While charging, the CHG pin is pulled lowindicaTIng the battery is being charged.The battery is charged to 4.2V with only a 1% error acrossthe temperature range. USB charge current, Adapter chargecurrent and charge terminaTIon currents can be programmedvia external resistors.The ISL9221 adds an additional feature in providing a limited amount of current to system architecture while protecting the system from destructively high voltage.
