The LTC4002 is a complete battery charger controller 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. The LTC4002 is available in the 8-lead SO and 10-lead DFN packages. Applications * Portable Computers * Charging Docks * Handheld Instruments * Wide Input Supply Range: * 4.7V to 22V – 4.2 Version * 8.9V to 22V – 8.4 Version * 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 * 8-Lead SO and 10-Lead DFN Packages https://elecena.pl/product/1365753/standalone-li-ion-switch-mode-battery-charger 2011-02-18 https://elecena.pl/product/1365753/standalone-li-ion-switch-mode-battery-charger 2014-06-12 https://elecena.pl/product/1365753/standalone-li-ion-switch-mode-battery-charger 2025-01-22