The LTC4007-1 is a constant-current/constant-voltage charger controller for 3- or 4-cell lithium-ion batteries. The PWM controller uses a synchronous, quasi-constant frequency, constant off-time architecture that will not generate audible noise even when using ceramic capacitors. Charging current is programmable to ±4% accuracy using a programming resistor. Charging current can also be monitored as a voltage across the programming resistor. The output float voltage is pin programmed for cell count (3 cells or 4 cells) and chemistry (4.2V/4.1V). A timer, programmed by an external resistor, sets the total charge time. The LTC4007-1 includes a thermistor input, which suspends charging if an unsafe temperature condition is detected. If the cell voltage is less than 3.25V, a low-battery indicator asserts and can be used to program a trickle charge current to safely charge depleted batteries. The FAULT pin is also asserted and charging terminates if the low-battery condition persists for more than 1/4 of the total charge time. LTC4007 LTC4007-1 Low battery threshold 4.2V cell 2.5V 3.25V Low battery threshold 4.1V cell 2.44V 3.173V Restart Enabled Disabled Package SSOP-24 QFN-24 Applications * Notebook Computers * Portable Instruments * Battery-Backup Systems * Li-Ion Chargers * Charger Controller for 3- or 4-Cell Lithium-Ion Batteries * High Conversion Efficiency: Up to 96% * Output Currents Exceeding 4A * ±0.8% Charging Voltage Accuracy * Built-In Charge Termination for Li-Ion Batteries * AC Adapter Current Limiting Maximizes Charge Rate * Thermistor Input for Temperature Qualified Charging https://elecena.pl/product/260187/4a-high-efficiency-li-ion-battery-charger 2007-03-04 https://elecena.pl/product/260187/4a-high-efficiency-li-ion-battery-charger 2014-07-10 https://elecena.pl/product/260187/4a-high-efficiency-li-ion-battery-charger 2025-01-21