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LTC4008 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4008 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC4008 4008fa TYPICAL APPLICATIO APPLICATIO S DESCRIPTIO FEATURES ■ General Purpose Charger Controller ■ High Conversion Efficiency: Up to 96% ■ Output Currents Exceeding 4A ■ ±0.8% Voltage Accuracy ■ AC Adapter Current Limiting Maximizes Charge Rate* ■ Thermistor Input for Temperature Qualified Charging ■ Wide Input Voltage Range: 6V to 28V ■ Wide Output Voltage: 3V to 28V ■ 0.5V Dropout Voltage; Maximum Duty Cycle: 98% ■ Programmable Charge Current: ±4% Accuracy ■ Indicator Outputs for Charging, C/10 Current Detection, AC Adapter Present, Input Current Limiting and Faults ■ Charging Current Monitor Output ■ Available in a 20-Pin Narrow SSOP Package 4A, High Efficiency, Multi-Chemistry Battery Charger The LTC ®4008 is a constant-current/constant-voltage charger controller. The PWM controller uses a synchro- nous, quasi-constant frequency, constant off-time archi- tecture that will not generate audible noise even when using ceramic capacitors. Charging current is program- mable with a sense resistor and programming resistor to ±4% typical accuracy. Charging current can be monitored as a voltage across the programming resistor. An external resistor divider and precision internal reference set the final float voltage. The LTC4008 includes a thermistor sensor input that will suspend charging if an unsafe temperature condition is detected and will automatically resume charging when battery temperature returns to within safe limits; a FAULT pin indicates this condition. A FLAG pin indicates when charging current has decreased below 10% of the pro- grammed current. An external sense resistor programs AC adapter current limiting. The ICL pin indicates when the charging current is being reduced by input current limiting so that the charging algorithm can adapt. ■ Notebook Computers ■ Portable Instruments ■ Battery Backup Systems 12.3V, 4A Li-Ion Charger BATMON VFB ICL ACP/SHDN FAULT FLAG NTC RT ITH GND ICL ACP FAULT FLAG DCIN INFET CLP CLN TGATE BGATE PGND CSP BAT PROG LTC4008 32.4k 0.47 µF THERMISTOR 10k NTC 0.12 µF 100k 100k 140k* 15k* 6.04k 150k VLOGIC DCIN 0V TO 28V 0.1 µF INPUT SWITCH 0.1 µF Q1 Q2 20 µF 10 µH 4.99k 3.01k 3.01k 0.025 Ω 0.02 Ω 20 µF SYSTEM LOAD Li-Ion BATTERY CHARGING CURRENT MONITOR 26.7k Q1: Si4431BDY Q2: FDC645N 0.0047 µF 4008 TA01 NOTE: * 0.25% TOLERANCE ALL OTHER RESISTORS ARE 1% TOLERANCE *Protected by U.S. Patents including 5723970 , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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