The ADP3801 and ADP3802 are complete battery charging
ICs. The devices combine a high accuracy final battery voltage
control with a constant charge current control and an on-board
Low Drop-Out Regulator (LDO). The accuracy of the final
battery voltage control is guaranteed to ±0.75% to safely charge
Li-Ion batteries. An internal multiplexer allows the alternate
charging of two separate battery stacks. The final voltage is pin
programmable to one of three Li-Ion options: 4.2 V (one Li-Ion
cell), 8.4 V (two Li-Ion cells), or 12.6 V (three Li-Ion cells).
Paired with an external microcontroller for charge termination,
the ADP3801/ADP3802 works as a fast charger for NiCad/
NiMH batteries or as a universal charger for all three battery
chemistries. In addition, a pin is provided for changing the final
battery voltage by up to ±10% to adjust for variations in battery
chemistry from different Li-Ion manufacturers without loss of
accuracy in the final battery voltage.