EFFICIENCY (%) LT3650-8.2/LT3650-8.4 High Voltage 2 Amp Monolithic 2-Cell Li-Ion Battery Charger Fea T Descrip T n Wide Input Voltage Range: 9V to 32V (40V Absolute The LT 3650 is a complete monolithic 2-cell Li-Ion/Polymer Maximum) battery charger that operates over a 9V to 32V input volt- n Programmable Charge Current: Up to 2A age range (11.5V minimum start-up voltage). The LT3650 n User-Selectable Termination: C/10 or Onboard provides a constant-current/constant-voltage charge Termination Timer characteristic, with maximum charge current externally n Dynamic Charge Rate Programming/Soft-Start Pin programmable up to 2A, set using an external current n Programmable Input Current Limit sense resistor. A precondition feature trickle-charges a n 1MHz Fixed Frequency low voltage battery, and bad-battery detection provides a n Average Current Mode Control signal and suspends charging if a battery does not respond n 0.5% Float Voltage Accuracy to preconditioning. n 5% Charge Current Accuracy The LT3650 can be configured to terminate charging when n 2.5% C/10 Detection Accuracy charge current falls to C/10, or one-tenth the programmed n NTC Resistor Temperature Monitor maximum current. Once charging is terminated, the LT3650 n Auto-Recharge at 97.5% Float Voltage enters a low current (85A) standby mode. An auto-restart n Auto-Precondition at <70% Float Voltage feature starts a new charging cycle if the battery voltage n Bad-Battery Detection with Auto-Reset drops 2.5% from the float voltage, or if a new battery is n Binary Coded Open-Collector Status Pins inserted into a charging system. n 3mm 3mm DFN-12 or MSOP-12 Package The LT3650 contains a user-programmable internal safety a T timer (typically set to a three hour full cycle time). The IC can be configured to use this internal timer if a time-based n Industrial Handheld Instruments termination scheme is desired in which charging can con- n 12V to 24V Automotive and Heavy Equipment tinue below C/10 until a desired time is reached. n Desktop Cradle Chargers n Notebook Computers The LT3650 is available in a low profile (0.75mm) 3mm 3mm 12-pin DFN and 12-pin MSOP packages. L, LT, LTC, LTM, Linear Technology, PowerPath and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical a T Charge Current, Efficiency and Power Loss vs Time 3.0 95 11.5V to 32V 2-Cell 2A Charger V = 20V IN EFFICIENCY 2.5 85 CMSH3-40MA CMSH3-40MA V IN POWER SW V IN 11.5V TO 32V LOSS 2.0 75 1F 10F CHARGE CLP BOOST CURRENT 10H LT3650-8.2 1.5 65 CMPSH1-4 SHDN SENSE 1.0 55 CHRG 0.05 BAT 0.5 45 FAULT + NTC 10F BATTERY TIMER RNG/SS 0 35 0.68F 0 20 40 60 80 100 120 140 160 180 200 365082 TA01a TIME (MINUTES) 365082 TA01b 36508284fd 1 CHARGE CURRENT (A), POWER LOSS (W) ion pplica ions pplica ion uresLT3650-8.2/LT3650-8.4 a T e Maxi Mu M r a T (Note 1) V ............................................................................40V SENSE-BAT ............................................... 0.5V to 0.5V IN SHDN, CHRG, FAULT ...............................V + 0.5V, 40V TIMER, RNG/SS, NTC ..............................................2.5V IN CLP .........................................................V 0.5V, 40V Operating Junction Temperature Range IN SW ............................................................................40V (Note 2) .................................................. 40C to 125C SW-V .....................................................................4.5V Storage Temperature Range ..................65C to 150C IN BOOST .................................................... SW + 10V, 50V Lead Temperature (Soldering, 10 sec) SENSE, BAT ..............................................................10V MSE ..................................................................300C p c F T TOP VIEW TOP VIEW SW V 1 12 IN 1 V 12 SW IN CLP 2 11 BOOST 2 11 BOOST CLP SHDN 3 10 SENSE SHDN 3 10 SENSE 13 13 CHRG 4 9 BAT CHRG 4 9 BAT FAULT 5 8 NTC FAULT 5 8 NTC TIMER 6 7 RNG/SS TIMER 6 7 RNG/SS MSE PACKAGE DD PACKAGE 12-LEAD PLASTIC MSOP 12-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 43C/W, = 3C/W JMAX JA JC T = 125C, = 43C/W, = 3C/W JMAX JA JC EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3650EDD-8.2 PBF LT3650EDD-8.2 TRPBF LDXT 12-Lead (3mm 3mm) Plastic DFN 40C to 85C LT3650IDD-8.2 PBF LT3650IDD-8.2 TRPBF LDXT 12-Lead (3mm 3mm) Plastic DFN 40C to 85C LT3650EDD-8.4 PBF LT3650EDD-8.4 TRPBF LFGR 12-Lead (3mm 3mm) Plastic DFN 40C to 85C LT3650IDD-8.4 PBF LT3650IDD-8.4 TRPBF LFGR 12-Lead (3mm 3mm) Plastic DFN 40C to 85C LT3650EMSE-8.2 PBF LT3650EMSE-8.2 TRPBF 365082 12-Lead Plastic MSOP 40C to 85C LT3650IMSE-8.2 PBF LT3650IMSE-8.2 TRPBF 365082 12-Lead Plastic MSOP 40C to 85C LT3650EMSE-8.4 PBF LT3650EMSE-8.4 TRPBF 365084 12-Lead Plastic MSOP 40C to 85C LT3650IMSE-8.4 PBF LT3650IMSE-8.4 TRPBF 365084 12-Lead Plastic MSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: