LT1937 LINER [Linear Technology], LT1937 Datasheet - Page 17

• Manufacturer Part Number: LT1937
• Description: 20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN
• Manufacturer: LINER [Linear Technology]

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