SNVAA36 February   2022 LM36010 , LM3642 , LM3643 , LM3644 , LM3648

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Key Specification of LM3644
    2. 1.2 LM3644 Simplified Block Diagram
  3. 2No Boost Inductor Flash Driving Design with LM3644
    1. 2.1 Why Try to Not Use Boost Inductor Solution?
    2. 2.2 No Boost Inductor Schematic of LM3644 for Two LED
    3. 2.3 No Boost Inductor Schematic of LM3644 for Single LED
    4. 2.4 Real Design Sample for No Boost Inductor Design, Torch Mode, Single LED
  4. 3PCB Layout Tips for LM3644 Without Boost Inductor
  5. 4References

1.1 Key Specification of LM3644

  • 2.5 V to 5.5 V Input Voltage Range
  • Dual Independent 1.5-A LED Current Source Up to 1500 mA per channel in Flash mode Programmability
  • Accurate and Programmable LED Current Range from 1.4 mA to 1.5 A
  • Torch Currents up to 360 mA (LM3644TT)
  • Flash Current up to 1500 mA
  • Support Flash Timeout function
  • Support Input Voltage Flash Monitor (IVFM)
  • Size: 1.69mm × 1.31mm, DSBGA (12)