LTC3418 datasheet(15/20 Pages) LINER

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LTC3418

3418f

PC Board Layout Checklist

When laying out the printed circuit board, the following

checklist should be used to ensure proper operation of the

LTC3418. Check the following in your layout.

1. A ground plane is recommended. If a ground plane layer

is not used, the signal and power grounds should be

segregated with all small-signal components returning to

the SGND pin at one point which is then connected to the

PGND pin close to the LTC3418.

2. Connect the (+) terminal of the input capacitor(s), CIN,

as close as possible to the PVIN pin. This capacitor

provides the AC current into the internal power MOSFETs.

3. Keep the switching node, SW, away from all sensitive

small-signal nodes.

4. Flood all unused areas on all layers with copper.

Flooding with copper will reduce the temperature rise of

power components. You can connect the copper areas to

any DC net (PVIN, SVIN, VOUT, PGND, SGND or any other

DC rail in your system).

5. Connect the VFB pin directly to the feedback resistors.

The resistor divider must be connected between VOUT and

SGND.

6. To minimize switching noise coupling to SVIN, place a

local filter between SVIN and PVIN.

APPLICATIO S I FOR ATIO

Figure 5. LTC3418 Layout Diagram

Bottom Layer

Top Layer

LTC3418 Datasheet(PDF) 15 Page - Linear Technology