This micropower multifunction power management integrated circuit (PMIC) is designed using LTC3554 manufactured by Linear Technology Corporation and is a solution for portable Li-Ion Polymer battery-based applications.
This NiCd charger allows simultaneous charging of up to seven NiCd batteries connected in series. This number can be increased if the supply voltage increases by about 1.65 V for each battery. Given that T2 is mounted on appropriate heat radiator, the input voltage can be increased to a maximum of 25 V.
A very simple 3.25W CV/CC charger can be designed using LinKSwitch || family IC manufactured by Power Integrations. This electronic circuit project is designed to provide a 5 volts output at a maximum current of 650mA . This 3.25W CV/CC charger , needs to be powered using a AC voltage between 85 and 265 VAC . The AC input power is rectified by diodes D1 through D4. Bulk storage capacitors C1 and C2 filter the rectified AC. Inductor L1 forms a pi (π) filter with C1 and C2 to attenuate conducted differential-mode EMI noise.