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LTC1732-4 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1732-4 Datasheet(HTML) 1 Page - Linear Technology |
1 / 8 page 1 LTC1732-4/LTC1732-4.2 Lithium-Ion Linear Battery Charger Controller October 2000 The LTC ®1732 is a complete constant-current/constant- voltage linear charge controller for lithium-ion (Li-Ion) batteries. Nickel-cadmium (NiCd) and nickel metal- hydride (NiMH) batteries can also be charged with con- stant current using external termination. Charge current can be programmed with 7% (max) accuracy using exter- nal sense and program resistors. An internal resistor divider and precision reference set the final float voltage with 1% accuracy. The SEL pin allows users to charge either 4.1V or 4.2V cells. When the input supply is removed, the LTC1732 automati- cally enters a low current sleep mode, dropping the battery drain current to 7 µA. 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 LTC1732 begins a new charge cycle when a discharged battery is connected to the charger or when the input power is applied. In addition, if the battery remains connected to the charger and the cell voltage drops below 3.8V for the LTC1732-4 or below 4.05V for the LTC1732-4.2, a new charge cycle will begin. The LTC1732 is available in the 10-pin MSOP package. s Complete Linear Charger Controller for 1-Cell Lithium-Ion Batteries s Preset Charge Voltage with 1% Accuracy s 4.5V to 12V Input Voltage Range s Programmable Charge Current s C/10 Charge Current Detection Output s Programmable Charge Termination Timer s Small, Thin 10-Pin MSOP Package s Select Pin to Charge Either 4.1V or 4.2V Cells (LTC1732-4) s Automatic Sleep Mode When Input Supply is Removed (Only 7 µA Battery Drain) s Automatic Trickle Charge of Low Voltage Cells s Programmable for Constant-Current-Only Mode s Battery Insertion Detect and Automatic Charging of Low-Battery Cell s Input Supply (Wall Adapter) Detection Output s 4.05V Recharge Threshold for 4.2V Cells (LTC1732-4.2) s 3.8V Recharge Threshold for 4.1V or 4.2V Cells (LTC1732-4) s Cellular Phones s Handheld Computers s Charging Docks and Cradles , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIONS TYPICAL APPLICATION Single Cell 4.2V Li-Ion Battery Charger Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. Final Electrical Specifications FEATURES DESCRIPTIO VCC VIN = 6V SENSE DRV R2 1k R1 1k RSENSE 0.2 Ω RPROG* 19.6k 4.2V Li-Ion CELL LTC1732-4 *SHUTDOWN INVOKED BY FLOATING THE PROG PIN BAT CHRG 9 8 2 MBRM120T3 10 µF 1732 TA01 1 µF IBAT = 500mA CTIMER 0.1 µF Q1 Si9430DY 7 1 6 5 + 3 10 4 ACPR TIMER PROG GND SEL |
Similar Part No. - LTC1732-4_00 |
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Similar Description - LTC1732-4_00 |
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