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LTC4006 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4006 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC4006 sn4006 4006is 4A, High Efficiency, Standalone Li-Ion Battery Charger May 2003 s Complete Charger Controller for 2-, 3- or 4-Cell Lithium-Ion Batteries s High Conversion Efficiency: Up to 96% s Output Currents Exceeding 4A s ±0.8% Accurate Preset Voltages: 8.4V, 12.6V, 16.8V s Built-In Charge Termination with Automatic Restart s AC Adapter Current Limiting Maximizes Charge Rate* s Automatic Conditioning of Deeply Discharged Batteries s Thermistor Input for Temperature Qualified Charging s Wide Input Voltage Range: 6V to 28V s 0.5V Dropout Voltage; Maximum Duty Cycle: 98% s Programmable Charge Current: ±5% Accuracy s Indicator Outputs for Charging, C/10 Current Detection and AC Adapter Present s Charging Current Monitor Output s 16-Pin Narrow SSOP Package s Notebook Computers s Portable Instruments s Battery-Backup Systems s Standalone Li-Ion Chargers , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIO S Final Electrical Specifications 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. 4A Li-Ion Battery Charger The LTC ®4006 is a complete constant-current/constant- voltage charger controller for 2-, 3- or 4-cell lithium bat- teries in a small package using few external components. The PWM controller is a synchronous, quasi-constant fre- quency, constant off-time architecture that will not gener- ate audible noise even when using ceramic capacitors. The LTC4006 is available in 8.4V, 12.6V and 16.8V versions with ±0.8% accuracy. Charging current is programmable with a single sense resistor to ±4%typicalaccuracy.Charg- ing current can be monitored as a representative voltage at the IMON pin. A timer, programmed by an external resistor, sets the total charge time or is reset to 25% of total charge time after C/10 charging current is reached. Charging au- tomatically resumes when cell voltage falls below 3.9V/cell. Fully discharged cells are automatically trickle charged at 10% of the programmed current until the cell voltage ex- ceeds 2.5V/cell. Charging terminates if the low-battery condition persists for more than 25% of the total charge time. LTC4006 includes a thermistor sensor input that sus- pends charging if an unsafe temperature condition is detected and automatically resumes charging when bat- tery temperature returns to within safe limits. DCIN CHG ACP/SHDN IMON NTC RT ITH GND CHG ACP INFET CLP CLN TGATE BGATE PGND CSP BAT LTC4006 0.12 µF THERMISTOR 10k NTC 309k TIMING RESISTOR (~2 HOURS) 0.0047 µF 0.47 µF 32.4k CHARGING CURRENT MONITOR 100k VLOGIC DCIN 0V TO 28V 3A 6k INPUT SWITCH 0.1 µF 15nF 20 µF 10 µH 5k 0.025 Ω 0.033 Ω 20 µF BATTERY 4006 TA01 FEATURES DESCRIPTIO TYPICAL APPLICATIO *U.S. Patent No. 5,723,970 |
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