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LT3650-8.X - High Voltage 2 Amp Monolithic 2-Cell Li-Ion Battery Charger

The LT3650 is a complete monolithic 2-cell Li-Ion/Polymer battery charger that operates over a 9V to 32V input voltage range (11.5V minimum start-up voltage). The LT3650 provides a constant-current/constant-voltage charge characteristic, with maximum charge current externally programmable up to 2A, set using an external current sense resistor. A precondition feature trickle-charges a low voltage battery, and bad-battery detection provides a signal and suspends charging if a battery does not respond to preconditioning. The LT3650 can be configured to terminate charging when charge current falls to C/10, or one-tenth the programmed maximum current. Once charging is terminated, the LT3650 enters a low current (85μA) standby mode. An auto-restart feature starts a new charging cycle if the battery voltage drops 2.5% from the float voltage, or if a new battery is inserted into a charging system. 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 termination scheme is desired in which charging can continue below C/10 until a desired time is reached. The LT3650 is available in a low profile (0.75mm) 3mm × 3mm 12-pin DFN and 12-pin MSOP packages.

Features Wide Input Voltage Range: 9V to 32V (40V Absolute Maximum) Programmable Charge Current: Up to 2A User-Selectable Termination: C/10 or Onboard Termination Timer Dynamic Charge Rate Programming/Soft-Start Pin Programmable Input Current Limit 1MHz Fixed Frequency Average Current Mode Control 0.5% Float Voltage Accuracy 5% Charge Current Accuracy 2.5% C/10 Detection Accuracy NTC Resistor Temperature Monitor Auto-Recharge at 97.5% Float Voltage Auto-Precondition at <70% Float Voltage Bad Battery Detection with Auto-Reset Binary Coded Open-Collector Status Pins 3mm × 3mm DFN-12 or MSOP-12 Package Typical Application

Applications Industrial Handheld Instruments 12V to 24V Automotive and Heavy Equipment Desktop Cradle Chargers Notebook Computers Packaging

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