GENERAL DESCRIPTION
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).

FEATURES
    Stand-Alone Li-Ion Battery Chargers
    High End-of-Charge Voltage Accuracy ±0.4% @ +25°C ±0.75% @ –10°C to +70°C
    Intelligent End-of-Charge Output Signal
    Pin Programmable Cell Number Select
    On Chip 3.3 V LDO Regulator
    Programmable Charge Current with High Side Sense
    Softstart Charge Current
    Undervoltage Lockout
    Drives External PMOS
    ±10% Adjustable End-of-Charge Voltage
    Charges NiCad, NiMH (with External mController)
    PWM Oscillator Frequency: ADP3801: 200 kHz ADP3802: 500 kHz

APPLICATIONS
    Fast Chargers
    Universal Chargers
    Cellular Phones
    Portable Computers
    Portable Instrumentation
    Desktop Chargers
    Personal Digital Assistants