The LTC4002ES8-4.2#PBF is a standalone Li-ion Switch Mode Battery Charger for one (4.2V) or two (8.4V) cell lithium-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.
● Wide input supply range (4.7 to 22V)
● 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
