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

1.2 LM3644 Simplified Block Diagram

LM3644 can support most of hero LED vender products in the market so as to make LED flash driving design more easily. It can support up to 2 channel LED flashing or torching with 1.5-A maximum flash current and 360 mA (LM3644TT) torch current per each channel. LM3644 also supports flash timeout and IVFM to keep flash LED and system always being in safe.

Figure 1-1 LM3644 LED Flash Driver