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LTC4052-42 Datasheet(PDF) 1 Page - Linear Integrated Systems |
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LTC4052-42 Datasheet(HTML) 1 Page - Linear Integrated Systems |
1 / 8 page LTC4052-4.2 1 405242i 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. TYPICAL APPLICATIO Lithium-Ion Battery Pulse Charger with Overcurrent Protection July 2002 Final Electrical Specifications Single Cell 4.2V, 1A, Standalone Li-Ion Battery Charger FEATURES APPLICATIO S The LTC ®4052 is a complete standalone pulse charger with integrated MOSFET for 1-cell lithium-ion batteries. An external sense resistor provides maximum charge current limiting as a safety precaution against a user connecting a wall adapter with the incorrect or no current limit. The internal MOSFET prevents reverse battery current from flowing if the input voltage is shorted to ground, eliminating the need for a blocking diode. As the battery accepts charge and approaches the programmed float voltage, the internal MOSFET begins switching off and on with the duty cycle gradually decreas- ing as the battery approaches a fully charged condition. A programmable timer ends the charge cycle. The near end-of-charge C/10 condition is indicated at the CHRG pin when the average charge current falls to one-tenth of the wallpack current. Removing the input voltage puts the LTC4052 into a sleep mode, dropping the battery current drain to less than 1 µA (maximum). The LTC4052 is available in a tiny 8-pin thermally enhanced MSOP package. s Standalone Lithium-Ion Battery Charger s Personal Information Appliances s Cellular Telephones s Cradle Chargers , LTC and LT are registered trademarks of Linear Technology Corporation. s Complete Standalone Pulse Charger for 1-Cell Lithium-Ion Batteries s Requires No Microcontroller s Internal 0.35 Ω NMOS Switch s Sense Resistor Limits Maximum Current for Safety s Programmable Charge Termination Timer for Maximum Capacity Charging s No Blocking Diode Required s 1% Float Voltage Accuracy s Near End-of-Charge (C/10) Detection Output s Low Battery Drain when Input Supply Is Removed s Automatic Trickle Charge for Low Battery s Automatic Battery Refresh s Thermal Shutdown Protection s Small 8-Pin Thermally Enhanced MSOP Package 1k 10k 4.7 Ω RSENSE 0.05 Ω 1-CELL 4.2V Li-Ion BATTERY 1k CHRG ACPR GATE BAT TIMER CTIMER 0.1 µF GND VIN LTC4052 SENSE 1 µF 0.047 µF 0.022 µF VIN = 4.5V TO 10V WITH 1A CURRENT LIMIT CHARGE STATUS 4052 TA01 AC PRESENT DESCRIPTIO TIME (HOURS) 0 0.5 1.0 2.0 1.5 2.5 3.0 4052 • TA01b 4.5 4.0 3.5 3.0 1.0 0.5 0 5 0 CONSTANT CURRENT PULSING CURRENT CHARGE CYCLE ENDS C/10 LTC4052 Charge Profile |
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