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LTC4012-3 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4012-3 Datasheet(HTML) 1 Page - Linear Technology |
1 / 28 page 40123fb LTC4012-3 Typical applicaTion FeaTures applicaTions DescripTion High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control The LTC®4012-3 is a constant-current/constant-voltage battery charger controller. It uses a synchronous quasi- constant frequency PWM control architecture that will not generateaudiblenoisewithceramicbulkcapacitors.Charge current is set by external resistors and can be monitored as an output voltage across the programming resistor. With no built-in termination, the LTC4012-3 charges a wide range of batteries under external control. TheLTC4012-3featuresfullyadjustableoutputvoltage.For charge management and safety, the IC includes an input P-channel MOSFET ideal diode controller, battery (output) overvoltageprotection,reversechargecurrentprotection, PWM soft-start and robust non-overlap control for an all N-channel MOSFET PWM power stage. ThedeviceincludesACadapterinputcurrentlimiting,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 reduced charge current as a result of AC adapter current limiting. Ideal diode control at the adaptor input improves charger efficiency. 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 INFET Low Loss Ideal Diode PowerPath™ Control n Wide Input Voltage Range: 6V to 28V n Wide Output Voltage Range: 2V to 28V n Indicator Outputs for Charging, C/10 Current Detection and Input Current Limiting n Analog Charge Current Monitor n Micropower Shutdown n 20-Pin 4mm × 4mm × 0.75mm QFN Package n Notebook Computers n Portable Instruments n Battery Backup Systems Efficiency at DCIN = 20V CLP FROM ADAPTER 13V TO 20V 0.1µF 5.1k 25m 3.01k 0.1µF 6.8µH 20µF 33m INFET 0.1µF 2µF 0.1µF 6.04k 26.7k LTC4012-3 DCIN CHRG 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 32.8k 4012-3 TA01 12.3V Li-Ion BATTERY 3.01k 301k + CHARGE CURRENT (A) 0 70 75 80 85 90 100 100 1000 10000 0.5 1 1.5 2 4012-3 TA02 2.5 3 95 LTC4012 LTC4012-3 GND X ACP X PIN 5 NAME VOUT = 12.3V RSENSE = 33m RIN = 3.01k RPROG = 26.7k EFFICIENCY POWER LOSS PART L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and 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. |
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