The LTC4002ES8-8.4#PBF is a standalone Li-ion switch mode Battery Charger. The LTC?4002 is a complete battery charger controller for one (4.2V) or two (8.4V) cell lithium-ion batteries. With a 500kHz switching frequency, this provides a small, simple and efficient solution to fast charge Li-ion batteries from a wide range of supply voltages. An external sense resistor sets the charge current with ±5% accuracy. An internal resistor divider and precision reference set the final float voltage to 4.2V per cell with ±1% accuracy. When the input supply is removed, the charger automatically enters a low current sleep mode, dropping the battery drain current to 10μA. An internal comparator detects the near end-of-charge condition while an internal timer sets the total charge time and terminates the charge cycle. After the charge cycle ends, if the battery voltage drops below 4.05V per cell, a new charge cycle will automatically begin.
- ±1% Charge voltage accuracy
- End-of-charge current detection output
- 3-hour Charge termination timer
- Constant switching frequency for minimum noise
- ±5% Charge current accuracy
- 10μA Low reverse battery drain current
- Automatic battery recharge
- Automatic shutdown when input supply is removed
- Automatic trickle charging of low voltage batteries
- Battery temperature sensing and charge qualification
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