LT3650-4.1 Datasheet | Linear Technology

LT3650-4.1/LT3650-4.2 High Voltage 2 Amp Monolithic Li-Ion Battery Charger Features n Wide Input Voltage Range: 4.75V to 32V (40V Absolute Maximum) n Programmable Charge Current Up to 2A n User-Selectable Termination: C/10 or Onboard Termination Timer n Dynamic Charge Rate Programming/Soft-Start Pin n Programmable Input Current Limit n No VIN Blocking Diode Required n 1MHz Fixed Frequency n Average Current Mode Control n 0.5% Float Voltage Accuracy n 5% Charge Current Accuracy n 2.5% C/10 Detection Accuracy n NTC Resistor Temperature Monitor n Auto-Recharge at 97.5% Float Voltage n Auto-Precondition at <70% Float Voltage n Bad-Battery Detection with Auto-Reset n Binary Coded Open-Collector Status Pins n 3mm × 3mm DFN-12 or MSOP-12 Package Applications n Industrial Handheld Instruments n 12V to 24V Automotive and Heavy Equipment n Desktop Cradle Chargers n Notebook puters Description The LT®3650 is a plete monolithic single-cell Li-Ion/ Polymer battery charger that operates over a 4.75V to 32V input voltage range (7.5V 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 tricklecharges 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...