The omnipotent Li-Ion battery charger with multimode controlled techniques is presented in this paper. The proposed chip can create a reversible three-stage linear Li-Ion battery charger and is designed with TSMC 0.35μm DPQM CMOS processes. The three-stage charger functions include trickle-current charging, large-current charging and constant-voltage charging. This technique can reduce the damage of Li-Ion battery. The design of structure, which creates an omnipotent charger, combines with the reversible three-stage charger; that is adapts to any Li-Ion batteries. The proposed circuit can adjust the maximum charge current of 350mA, the constant voltage is set to 4.2V. Input voltage of the proposed circuit is from 4.4V to 4.8V. The average efficiency of the proposed charger is about 79%. The omnipotent charger can precisely provide VOUT where range is from 2.2V to 4.2V. The chip area is 1.5×1.5mm2.
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