LT3650EDD-8.4#TRPBF

LT3650-8.4 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). It 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. It can be configured to terminate charging when charge current falls to C/10, or one-tenth the programmed maximum current. 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. Applications includes industrial handheld instruments, 12V to 24V automotive and heavy equipment, desktop cradle chargers and notebook computers.

• Contains a user-programmable internal safety timer (typically set to a three hour full cycle time)
• User-selectable termination: C/10 or on-board 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 <lt/>70% float voltage
• Bad-battery detection with auto-reset, binary coded open-collector status pins
• Typical battery float voltage of 8.4V
• Battery precondition threshold voltage of 5.8V
• 12-lead plastic DFN package, -40°C to 85°C temperature range

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