The LTC1732 is a complete constant-current/constantvoltagelinear charger controller for lithium-ion(Li-Ion) batteries. Nickel-cadmium (NiCd) and nickel metalhydride(NiMH) batteries can also be charged with constantcurrent using external termination. Charge currentcan be programmed with 7% (max) accuracy using externalsense and program resistors. An internal resistordivider and precision reference set the final float voltagewith 1% accuracy. The SEL pin allows users to chargeeither 4.1V or 4.2V cells.When the input supply is removed, the LTC1732 automaticallyenters a low current sleep mode, dropping the batterydrain current to 7mA. An internal comparator detects theend-of-charge (C/10) condition while a programmabletimer, using an external capacitor, sets the total chargetime. Fully discharged cells are automatically trickle chargedat 10% of the programmed current until cell voltageexceeds 2.457V.
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