This is a document about ADP3801/ADP3802, ADP3801/ADP3802 is a high frequency switch mode dual lithium ion battery charger manufactured by Analog Devices. The charger has high end of charge voltage accuracy, intelligent end of charge output signal pin, programmable cell number selection, on-chip 3.3V LDO regulator, programmable charge current with high side sense, soft start charge current, undervoltage lockout, drives external PMOS, 10% adjustable end of charge voltage and charges NiCad, NiMH batteries (with external controller).
The ADP3801 and ADP3802 are complete battery charging integrated circuits designed to combine high accuracy final battery voltage control with constant charge current control. These devices feature an on-board Low Drop-Out (LDO) regulator and utilize an internal multiplexer to allow the alternate charging of two separate battery stacks.
The chips support pin-programmable cell number selection for one, two, or three Li-Ion cells, with final voltages guaranteed to within 0.75% accuracy across a temperature range of -10°C to +70°C. When paired with an external microcontroller, the devices can function as fast chargers for NiCad/NiMH batteries or universal chargers for various battery chemistries.
| Oscillator Frequency (ADP3801) | 200 kHz |
|---|---|
| Final Battery Voltage Accuracy (+25°C, 1 Cell) | 4.200 V (Typical) |
| LDO Output Voltage (Typical) | 3.3 V |
| Supply Current (No External Loads) | 5.0 mA to 7.0 mA |
The typical PWM oscillator frequency for the ADP3801 is 200 kHz.
The typical PWM oscillator frequency for the ADP3802 is 500 kHz.
The device supports final battery voltages of 4.2 V (one cell), 8.4 V (two cells), or 12.6 V (three cells).