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CAT4139
Board Layout
The CAT4139 is a high-frequency switching regulator.
The traces that carry the high-frequency switching current
have to be carefully laid out on the board in order to
minimize EMI, ripple and noise in general. The thicker lines
on Figure 26 show the switching current path. All these
traces have to be short and wide enough to minimize the
parasitic inductance and resistance. The loop shown on
Figure 26 corresponds to the current path when the
CAT4139 internal switch is closed. On Figure 27 is shown
the current loop, when the CAT4139 switch is open. Both
loop areas should be as small as possible.
Capacitor C1 has to be placed as close as possible to the
VIN pin and GND. The capacitor C2 has to be connected
separately to the top LED anode. A ground plane under the
CAT4139 allows for direct connection of the capacitors to
ground. The resistor R1 must be connected directly to the
GND pin of the CAT4139 and not shared with the switching
current loops and any other components.
V IN
L
D
V OUT
V IN
L
D
V OUT
VIN
SW
VIN
SW
SHDN
CAT4139
Switch
Closed
FB
SHDN
CAT4139
Switch
Open
FB
C 1
GND
C 2
R1
C 1
GND
C 2
R1
Figure 26. Closed ? switch Current Loop
Figure 27. Open ? switch Current Loop
Figure 28. Recommended PCB Layout
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