ADI LTC1731EMS8-4.2#PBF

The LTC1731 is a complete constant-current/constant-voltage linear charger controller for single cell lithium-ion batteries. Nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries can also be charged with constant current using external termination. The external sense resistor sets the charge current with 5% accuracy. An internal resistor divider and precision reference set the final float potential with ±1% accuracy. The output float voltage is set internally to 4.1V (LTC1731 - 4.1) or 4.2V. When the input supply is removed, the LTC1731 automatically enters a low current sleep mode, dropping the battery drain current to typically 7μA. An internal comparator detects the end-of-charge (C/10) condition while a programmable timer, using an external capacitor, sets the total charge time. Fully discharged cells are automatically trickle charged at 10% of the programmed current until cell voltage exceeds 2.457V. The LTC1731 is available in the 8-pin MSOP and SO packages.

• Complete Linear Charger Controller for 1-Cell Lithium-Ion Batteries
• 1% Voltage Accuracy
• Programmable Charge Current
• C/10 Charge Current Detection Output
• Programmable Charge Termination Timer
• Space Saving 8-Pin MSOP Package
• Automatic Sleep Mode When Input Supply is Removed [7μA Battery Drain]
• Automatic Trickle Charging of Low Voltage Cells
• Programmable for Constant-Current-Only Mode

• Cellular Phones
• Handheld Computers
• Charging Docks and Cradles
• Programmable Current Source