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