Datasheet

LT3740
16
3740fc
APPLICATIONS INFORMATION
PC Board Layout Considerations
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
Place the power components close together with
short and wide interconnecting trances. The power
components consist of the top and bottom MOSFETs,
the inductor, C
IN
and C
OUT
. One way to approach this
is to simply place them on the board fi rst.
Similar attention should be paid to the power components
that make up the boost converter. They should also be
placed close together with short and wide traces.
Always use a ground plane under the switching regulator
to minimize interplane coupling.
Minimize the parasitic inductance in the loop of
C
IN
, MOSFETs and D1 which carries large switching
current.
Use compact plane for switch node (SW) to improve
cooling of the MOSFETs and to keep EMI low.
Use planes for V
IN
and V
OUT
to maintain good voltage
ltering and to keep power losses low. Unused areas
can be fi lled with copper and connect to any DC node
(V
IN
, V
OUT
, GND)
Place C
B
close to BIAS pin and input capacitor.
Keep the high dv/dt nodes (SW, TG, BG, SWB) away
from sensitive small signal nodes.