LT3498
APPLICATIONS INFORMATION—LED AND OLED DRIVER
Board Layout Considerations
node. The FB2 connection for the feedback resistor R
FB2
should be tied directly from the V
pin to the FB2
OUT2
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
To prevent electromagnetic interference (EMI) problems,
properlayoutofhighfrequencyswitchingpathsisessential.
Minimize the length and area of all traces connected to
the switching node pins (SW1 and SW2). Keep the sense
voltage pins (CAP1 and LED1) away from the switching
pin and be kept as short as possible, ensuring a clean,
noise-free connection. Place C and C next to the
OUT1
OUT2
CAP1 and CAP2 pins respectively. Always use a ground
planeendertheswitchingregulatortominimizeinterplane
coupling. Recommendedcomponentplacementisshown
in Figure 13.
R
SENSE1
LED1
CAP1
C1
SW1
1
2
3
4
5
6
12
11
10
9
CTRL1
GND
L1
L2
GND
V
IN
C
IN
CTRL2
SW2
8
7
R
FB2
C3
C2
V
OUT2
FB2
V
OUT2
CAP2
3498 F13
GND
VIAS TO GROUND PLANE REQUIRED TO
IMPROVE THERMAL PERFORMANCE
VIAS TO V
OUT2
Figure 13. Recommended Board Layout
3498f
17
Linear [ Linear ]
