DESCRIPTION
The LT®3651 is a 1 cell 4A Li-Ion/Polymer battery charger that operates with input voltages up to 32V. An efficient monolithic average current mode synchronous switching regulator provides constant current, constant voltage charging with programmable maximum charge current. A charging cycle starts with battery insertion or when the battery voltage drops 2.5% below the float voltage.

FEATURES
■ Wide Input Voltage Range: Up to 32V (40V Absolute Maximum)
■ Programmable Charge Current Up to 4A
■ Selectable C/10 or Onboard Timer Termination
■ Dynamic Charge Rate Programming/Soft-Start
■ Programmable Input Current Limit
■ 0.5% Float Voltage Accuracy
■ 7.5% Charge Current Accuracy
■ 4% C/10 Detection Accuracy
■ NTC Resistor Temperature Monitor
■ Auto-Recharge at 97.5% Float Voltage
■ Auto-Precondition <70% Float Voltage
■ Bad Battery Detection with Auto-Reset
■ Average Current Mode, Synchronous Switcher
■ User Programmable Frequency
■ Low Profile (0.75mm) 5mm × 6mm 36-Pin QFN Package

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