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