LTC4002EDD-4.2#PBF Datasheet PDF - Linear Technology

The LTC4002EDD-4.2#PBF is a complete Battery Charger Controller for 4.2V cell Li-ion batteries. With a 500kHz switching frequency, the LTC4002 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 LTC4002 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.

● High efficiency current mode PWM controller with 500kHz switching frequency

● ±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

● Low 10µA 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

● Stable with ceramic output capacitor