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LTC4009CUF-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC4009CUF-PBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 28 page 1 4009fb LTC4009 LTC4009-1/LTC4009-2 TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION High Efficiency, Multi-Chemistry Battery Charger The LTC4009 is a constant-current/constant-voltage battery charger controller. It uses a synchronous quasi-constant frequency PWM control architecture that will not generate audible noise with ceramic bulk capacitors. Charge cur- rent is set by the combination of external sense, input and programming resistors. With no built-in termination, the LTC4009 family charges a wide range of batteries under external control. TheLTC4009featuresafullyadjustableoutputvoltage,while the LTC4009-1 and LTC4009-2 can be pin-programmed for lithium-ion/polymer battery packs of 1-, 2-, 3- or 4-series cells. The LTC4009-1 provides output voltage of 4.1V/cell, and the LTC4009-2 is a 4.2V/cell version. The device includes AC adapter input current limiting which maximizes the charge rate for a fixed input power level. An external sense resistor programs the input current limit, and the ICL status pin indicates when the battery charge current is being reduced as a result of AC adapter current limiting. The CHRG status pin is active during all charging modes, including special indication for low charge current. n General Purpose Battery Charger Controller n Efficient 550kHz Synchronous Buck PWM Topology n ±0.5% Output Float Voltage Accuracy n Programmable Charge Current: 4% Accuracy n Programmable AC Adapter Current Limit: 3% Accuracy n No Audible Noise with Ceramic Capacitors n Wide Input Voltage Range: 6V to 28V n Wide Output Voltage Range: 2V to 28V n Indicator Outputs for AC Adapter Present, Charging, C/10 Current Detection and Input Current Limiting n Analog Charge Current Monitor n Micropower Shutdown n Thermally Enhanced 20-Pin 4mm × 4mm × 0.75mm QFN Package n Notebook Computers n Portable Instruments n Battery Backup Systems Efficiency at DCIN = 20V L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5723970. CLP FROM ADAPTER 13V TO 20V CHARGE CURRENT MONITOR 0.1μF 5.1k 33mΩ 3.01k 0.1μF 6.8μH 33mΩ DCIN 0.1μF 2μF 0.1μF 14.3k 1.5k 6.04k 301k 32.8k 26.7k LTC4009 DCDIV CHRG ACP ICL SHDN ITH PROG CLN BOOST TGATE SW INTVDD BGATE TO/FROM MCU GND CSP CSN BAT FBDIV VFB 20μF POWER TO SYSTEM 4.7nF 20μF 4009 TA01a 12.3V Li-Ion BATTERY 3.01k + CHARGE CURRENT (A) 0 70 75 80 85 90 100 100 1000 10000 0.5 1.0 1.5 2.0 4009 TA01b 2.5 3.0 95 EFFICIENCY POWER LOSS VFLOAT = 12.3V RSENSE = 33mΩ RIN = 3.01k RPROG = 26.7k DIN = SSB44 L = IHLP-2525CZ 6.8μH |
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