The ISL9201 is an integrated single-cell Li-ion or Li-polymercharger capable of operating at an input voltage as low as2.5V. The low operating voltage allows the charger to workwith a variety of AC adapters.The ISL9201 operates as a linear charger when the ACadapter is a voltage source. The battery is charged in astandard Li-ion charge profile, i.e. a constant current phasefollowed be a constant voltage phase (CC/CV). The chargecurrent during the constant current phase is determined by theexternal resistor connected to the IREF pin. When the adapteroutput is a current-limited voltage source and the current limitis smaller than the programmed constant current of the IC, theISL9201 operates as a pulse charger where the chargecurrent is determined by the current limit of the AC adapterduring the constant current phase. The ISL9201 operates in alinear mode during the constant voltage phase in both adaptercases.
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