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

3 PCB Layout Tips for LM3644 Without Boost Inductor

A good PCB layout will guarantee good performance, so designer has to pay more attention on PCB layout. A good example with LM3644 without boost inductor is shown in Figure 3-1.

Figure 3-1 LM3644 Dual Channel PCB Layout
  • Placed CIN , COUT capacitors close to LM3697, the power trace should be short and wide to decrease power loss on PCB trace
  • GND pin should be connected to main ground plane directly to get better thermal sink and better EMI performance