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LTC1731-8.2 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1731-8.2 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LTC1731-8.2/LTC1731-8.4 sn1731 17318fs FEATURES APPLICATIO S DESCRIPTIO TYPICAL APPLICATIO Lithium-Ion Linear Battery Charger Controller The LTC ®1731-8.2/LTC1731-8.4 are complete constant- current/constant-voltage linear charger controllers for 2- cell lithium-ion (Li-Ion)batteries. Nickel-cadmium (NiCd) and nickel-metal-hydride (NiMH) batteries can also be charged with constant current using external termina- tion. The external sense resistor sets the charge current with 7% accuracy. An internal resistor divider and preci- sion reference set the final float potential with 1% accu- racy. The output float voltages are set internally to 8.2V (LTC1731-8.2) or 8.4V (LTC1731-8.4). When the input supply is removed, the LTC1731-8.2/ LTC1731-8.4 automatically enter a low current sleep mode, dropping the battery drain current to typically 15 µA. An internal comparator detects the end-of-charge (C/10) con- dition while a programmable timer, using an external capacitor, sets the total charge time. Fully discharged cells are automatically trickle charged at 10% of the pro- grammed current until battery voltage exceeds 4.95V. The LTC1731-8.2/LTC1731-8.4 are available in the 8-pin MSOP and SO packages. For 1-cell Li-Ion battery charg- ing, see the LTC1731-4.1 and LTC1731-4.2 data sheets. s Complete Linear Charger Controller for 2-Cell Lithium-Ion Batteries s 1% Voltage Accuracy s Programmable Charge Current s C/10 Charge Current Detection Output s Programmable Charge Termination Timer s Space Saving 8-Pin MSOP Package s Automatic Sleep Mode When Input Supply is Removed (15 µA Battery Drain) s Automatic Trickle Charging of Low Voltage Cells s Programmable for Constant-Current-Only Mode s Cellular Phones s Handheld Computers s Charging Docks and Cradles s Programmable Current Source , LTC and LT are registered trademarks of Linear Technology Corporation. 400mA Li-Ion Charger VCC VIN = 9V SENSE DRV 2k RSENSE 0.2 Ω RPROG* 19.6k 2-CELL Li-ION LTC1731-8.4 *SHUTDOWN INVOKED BY FLOATING THE PROG PIN BAT CHRG 8 7 MBRM120T3 10 µF 1731 TA01 1 µF IBAT = 400mA CTIMER 0.1 µF Q1 Si9430DY 6 1 5 4 2 3 TIMER PROG GND + CHARGE STATUS Typical Li-Ion Charge Cycle TIME (HOURS) 0 400 300 200 100 0 9 8 7 6 1.5 2.5 1731 TA01b 0.5 1.0 2.0 3.0 CONSTANT VOLTAGE CONSTANT CURRENT TIMER STOPS CHRG LED OFF BATTERY VOLTAGE 400mA HR BATTERY CHARGE CURRENT |
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Similar Description - LTC1731-8.2_15 |
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