LT3650EMSE-8.4#PBF

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1. Description

TheLT®3650 is a completemonolithic 2-cellLi-Ion/Polymer battery charger that operates over a 9V to 32V input voltage range (11.5V minimum start-up voltage). The LT3650EMSE-8.4#PBF 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 andsuspends chargingif a batterydoesnotrespond to preconditioning. The LT3650 can be configured to terminate charging when charge current falls to C/10, or one-tenth the programmed maximumcurrent. Oncechargingisterminated, theLT3650 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 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.

2. Features

    1. Wide Input Voltage Range: 9V to 32V (40V Absolute Maximum)  

    2. Programmable Charge Current: Up to 2A

    3. User-Selectable Termination: C/10 or Onboard Termination Timer

    4. Dynamic Charge Rate Programming/Soft-Start Pin

    5. Programmable Input Current Limit 

    6. 1MHz Fixed Frequency

    7. Average Current Mode Control

    8. 0.5% Float Voltage Accuracy

    9. 5% Charge Current Accuracy

  10. 2.5% C/10 Detection Accuracy

  11. NTC Resistor Temperature Monitor

  12. Auto-Recharge at 97.5% Float Voltage

  13. Auto-Precondition at <70% Float Voltage

  14. Bad-Battery Detection with Auto-Reset

  15. Binary Coded Open-Collector Status Pins

  16. 3mm × 3mm DFN-12 or MSOP-12 Package

3. Applications

    1. Industrial Handheld Instruments

    2. 12V to 24V Automotive and Heavy Equipment

    3. Desktop Cradle Chargers

    4. Notebook Computers

4. Pin Configuration

5. Typical Application

6. Package Description