LT3650EMSE-4.2 LT3650IMSE-4.2 LT3650EMSE-8.4 LT3650IMSE-8.4 LT3650 - High Voltage 2 Amp Monolithic Li-Ion Battery Charger

Features and Benefits

• Wide Input Voltage Range: 4.75V 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

• No VIN Blocking Diode Required

• 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

Product details

The LT3650 is a complete 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 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 fl oat 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.

Applications

• Industrial Handheld Instruments

• 12V to 24V Automotive and Heavy Equipment

• Desktop Cradle Chargers

• Notebook Computers