lt3740 Linear Technology Corporation, lt3740 Datasheet - Page 16
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lt3740
Manufacturer Part Number
lt3740
Description
Wide Operating Range, Valley Mode, No Rsense Synchronous Step-down Controller
Manufacturer
Linear Technology Corporation
Datasheet
1.LT3740.pdf
(20 pages)
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APPLICATIO S I FOR ATIO
LT3740
PC Board Layout Considerations
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
■
■
■
16
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
to simply place them on the board first.
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.
IN
U
and C
OUT
U
. One way to approach this is
W
U
■
■
■
■
■
Minimize the parasitic inductance in the loop of C
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
filtering and to keep power losses low. Unused areas
can be filled with copper and connect to any DC node
(V
Place C
Keep the high dv/dt nodes (SW, TG, BG, SWB) away
from sensitive small signal nodes.
IN
, V
OUT
B
close to BIAS pin and input capacitor.
, GND)
IN
and V
OUT
to maintain good voltage
3740fa
IN
,