A multi-mode LDO-based Li-ion battery charger in 0.35/spl mu/m CMOS technology

The paper designs a CMOS Li-ion battery charger that uses multi-mode low dropout (LDO) voltage regulator associated with current sense circuit to supply trickle current, large constant current and constant voltage. The whole circuits have been approved by HSPICE with TSMC 0.35/spl mu/m 2P4M CMOS process. The simulation results provide the trickle current of 150mA, the maximum charging current of 312mA and charging voltage of 4.2V at input voltage of 4.5V. The power efficiency of 72.3% is acceptable under the power of 1.28 W.