LTC4006 4A, High Efficiency, Standalone Li-Ion Battery Charger FEATURES DESCRIPTIO Complete Charger Controller for 2-, 3- or 4-Cell The LTC 4006 is a complete constant-current/constant- Lithium-Ion Batteries voltage charger controller for 2-, 3- or 4-cell lithium bat- High Conversion Efficiency: Up to 96% teries in a small package using few external components. Output Currents Exceeding 4A The PWM controller is a synchronous, quasi-constant fre- 0.8% Accurate Preset Voltages: 8.4V, 12.6V, 16.8V quency, constant off-time architecture that will not gener- Built-In Charge Termination with Automatic Restart ate audible noise even when using ceramic capacitors. AC Adapter Current Limiting Maximizes Charge Rate* The LTC4006 is available in 8.4V, 12.6V and 16.8V versions Automatic Conditioning of Deeply Discharged with 0.8% voltage accuracy. Charging current is program- Batteries mable with a single sense resistor to 4% typical accuracy. Thermistor Input for Temperature Qualified Charging Charging current can be monitored as a representative Wide Input Voltage Range: 6V to 28V voltage at the I pin. A timer, programmed by an external MON 0.5V Dropout Voltage Maximum Duty Cycle: 98% resistor, sets the total charge time or is reset to 25% of total Programmable Charge Current: 4% Accuracy charge time after C/10 charging current is reached. Charg- Indicator Outputs for Charging, C/10 Current ing automatically resumes when the cell voltage falls below Detection and AC Adapter Present 3.9V/cell. Charging Current Monitor Output Fully discharged cells are automatically trickle charged at 16-Pin Narrow SSOP Package 10% of the programmed current until the cell voltage ex- U ceeds 2.5V/cell. Charging terminates if the low-battery APPLICATIO S condition persists for more than 25% of the total charge time. Notebook Computers Portable Instruments The LTC4006 includes a thermistor sensor input that Battery-Backup Systems suspends charging if an unsafe temperature condition is Standalone Li-Ion Chargers detected and automatically resumes charging when the battery temperature returns to within safe limits. , 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. TYPICAL APPLICATIO 4A Li-Ion Battery Charger DCIN INPUT SWITCH 0V TO 28V 3A 0.1F 5k V LOGIC DCIN INFET 100k 15nF 0.033 LTC4006 CHG CLP CHG TO SYSTEM LOAD ACP ACP/SHDN CLN 20F CHARGING I TGATE MON 10H CURRENT MONITOR 0.025 32.4k NTC BGATE BATTERY R PGND 0.0047F T 20F THERMISTOR I CSP TH 309k 10k TIMING 6k GND BAT NTC RESISTOR 0.47F (~2 HOURS) 4006 TA01 0.12F 4006fa 1 U ULTC4006 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) TOP VIEW Voltage from DCIN, CLP, CLN, TGATE, INFET, ORDER PART DCIN 1 16 INFET ACP/SHDN, CHG to GND ....................... +32V to 0.3V NUMBER CHG 2 15 BGATE Voltage from CLP to CLN..................................... 0.3V LTC4006EGN-2 ACP/SHDN 3 14 PGND CSP, BAT to GND................................... +28V to 0.3V R 4 13 TGATE T LTC4006EGN-4 R to GND ................................................. +7V to 0.3V T GND 5 12 CLN LTC4006EGN-6 NTC ........................................................ +10V to 0.3V NTC 6 11 CLP I 7 10 BAT GN PART MARKING TH Operating Ambient Temperature Range I 8 9 CSP MON (Note 4) ............................................. 40C to 85C 40062 GN PACKAGE Operating Junction Temperature ......... 40C to 125C 40064 16-LEAD PLASTIC SSOP Storage Temperature Range ................. 65C to 150C T = 125C, = 110C/W JMAX JA 40066 Lead Temperature (Soldering, 10 sec).................. 300C Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: