SPELL CHECK COMPLETED LT3650-4.1/LT3650-4.2 High Voltage 2 Amp Monolithic Li-Ion Battery Charger FeaTuresDescripTion n Wide Input Voltage Range: 4.75V to 32V The LT®3650 is a complete monolithic single-cell Li-Ion/ (40V Absolute Maximum) Polymer battery charger that operates over a 4.75V to n Programmable Charge Current Up to 2A 32V input voltage range (7.5V minimum start-up voltage). n User-Selectable Termination: C/10 or Onboard The LT3650 provides a constant-current/constant-voltage Termination Timer charge characteristic, with maximum charge current n Dynamic Charge Rate Programming/Soft-Start Pin externally programmable up to 2A, set using an external n Programmable Input Current Limit current sense resistor. A precondition feature trickle- n No VIN Blocking Diode Required charges a low voltage battery, and bad-battery detection n 1MHz Fixed Frequency provides a signal and suspends charging if a battery does n Average Current Mode Control not respond to preconditioning. n 0.5% Float Voltage Accuracy The LT3650 can be configured to terminate charging when n 5% Charge Current Accuracy charge current falls to C/10, or one-tenth the programmed n 2.5% C/10 Detection Accuracy maximum current. Once charging is terminated, the LT3650 n NTC Resistor Temperature Monitor enters a low current (85µA) standby mode. An auto-restart n Auto-Recharge at 97.5% Float Voltage feature starts a new charging cycle if the battery voltage n Auto-Precondition at <70% Float Voltage drops 2.5% from the float voltage, or if a new battery is n Bad-Battery Detection with Auto-Reset inserted into a charging system. n Binary Coded Open-Collector Status Pins n 3mm × 3mm DFN-12 or MSOP-12 Package The LT3650 contains a user-programmable internal safety timer (typically set to a three hour full cycle time). The IC can be configured to use this internal timer if a time-based applicaTions termination scheme is desired in which charging can con- n tinue below C/10 until a desired time is reached. Industrial Handheld Instruments n 12V to 24V Automotive and Heavy Equipment The LT3650 is available in a low profile (0.75mm) 3mm × n Desktop Cradle Chargers 3mm 12-pin DFN and 12-pin MSOP packages. n Notebook Computers 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 applicaTionVBAT and Efficiency vs IBAT7.5V to 32V Single-Cell Li-Ion 2A Charger 100 VBAT 4.20 CMSH3-40MA VIN V SW 90 IN 7.5V to 32V V 1µF IN = 12V 10µF 4.15 V CLP BOOST B 6.8µH AT V LT3650-4.2 IN = 20V ( CMPSH1-4 80 V SHDN ) SENSE EFFICIENCY (%) 4.10 CHRG 0.05Ω 70 BAT FAULT NTC + 4.05 10µF Li-ION TIMER RNG/SS BATTERY 60 0 0.5 1 1.5 2 3650 TA01a IBAT (A) 365042 TA01b 36504142fc 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
