LT3650-8.4 Datasheet | Linear Technology

Features n Wide Input Voltage Range: 9V 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 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 L, LT, LTC, LTM, Linear Technology, Power Path and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. LT3650-8.2/LT3650-8.4 High Voltage 2 Amp Monolithic 2-Cell Li-Ion Battery Charger Description The LT®3650 is a plete 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...