FPV1006-125-R datasheet(37/41 Pages) VICOR

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Cool-Power® ZVS Switching Regulators

Rev 2.5

Page 37 of 41

06/2017

PI33xx-x0

Layout Guidelines

To optimize maximum efficiency and low noise performance

from a PI33xx-x0 design, layout considerations are necessary.

Reducing trace resistance and minimizing high current loop

returns along with proper component placement will contribute

to optimized performance.

A typical buck converter circuit is shown in Figure 63. The

potential areas of high parasitic inductance and resistance are the

circuit return paths, shown as LR below.

The path between the COUT and CIN capacitors is of particular

importance since the AC currents are flowing through both of

them when Q1 is turned on.

Figure 64, schematically, shows the reduced trace length

between input and output capacitors. The shorter path

lessens the effects that copper trace parasitics can have on the

PI33xx-x0 performance.

When Q1 is on and Q2 is off, the majority of CIN’s current is used

to satisfy the output load and to recharge the COUT capacitors.

When Q1 is off and Q2 is on, the load current is supplied by the

inductor and the COUT capacitor as shown in Figure 65. During

this period CIN is also being recharged by the VIN. Minimizing CIN

loop inductance is important to reduce peak voltage excursions

when Q1 turns off. Also, the difference in area between the CIN

loop and COUT loop is vital to minimize switching and GND noise.

The recommended component placement, shown in Figure 66,

illustrates the tight path between CIN and COUT (and VIN and VOUT)

for the high AC return current. This optimized layout is used on

the PI33xx-x0 evaluation board.

Figure 67 details the recommended receiving footprint for

PI33xx-x0 10mm x 14mm package. All pads should have a final

copper size of 0.55mm x 0.55mm, whether they are solder-mask

defined or copper defined, on a 1mm x 1mm grid. All stencil

openings are 0.45mm when using either a 5mil or 6mil stencil.

OUT

Figure 63 — Typical Buck Converter

OUT

IND

Figure 64 — Current flow: Q1 closed

OUT

Figure 65 — Current flow: Q2 closed

OUT

GND

VSW

Figure

66 — Recommended component placement and

metal routing

Murata Part Number

Description

GRM188R71C105KA12D

1μF 16V 0603 X7R

GRM319R71H104KA01D

0.1μF 50V 1206 X7R

GRM31CR60J107ME39L

100μF 6.3V 1206 X5R

GRM31CR71H475KA12K

4.7μF 50V 1206 X7R

GRM31CR61A476ME15L

47μF 10V 1206 X5R

GRM31CR61E226KE15L

22μF 25V 1206 X5R

Table 6 — Capacitor manufacturer part numbers

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