Li-ion/Li-Polymer Battery Charger Accepting Two Power SourcesThe ISL9214A is a fully integrated low-cost single-cell Li-ionor Li-polymer battery charger. The charger accepts twopower inputs, normally one from a USB (Universal SerialBus) port and the other from a desktop cradle. TheISL9214A is an ideal charger for smart handheld devicesthat need to communicate with a personal computer viaUSB.The ISL9214A features 28V maximum voltages for both thecradle and the USB inputs. Due to the 28V rated inputs,low-cost, large output tolerance adapters can be used safely.When both inputs are powered, the cradle input is used tocharge the battery. The charge current is programmable forthe cradle input with a small resistor. The end-of-chargecurrent is also programmable by another external resistor.
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