lt3466efe-trpbf Linear Technology Corporation, lt3466efe-trpbf Datasheet - Page 14

• Manufacturer Part Number: lt3466efe-trpbf
• Description: White Led Driver And Boost Converter In 3mm X 3mm Dfn Package
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
LT3466-1
The V
be obtained from the Philips BC807 data sheet:
Picking the closest 1% resistor value yields:
BOARD LAYOUT CONSIDERATION
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 essen-
tial. Minimize the length and area of all traces connected to
the switching node pins (SW1 and SW2). Keep the feed-
back pins (FB1 and FB2) away from the switching nodes.
The DFN package has an exposed paddle that must be
connected to the system ground. The ground connection
for the feedback resistors should be tied directly to the
14
R
R
R
BASE
BASE
BASE
CE(SAT)
= 13.6k
= 14k
=
16
and V
V
–
BE(SAT)
0 75
U
5
.
V
+
mA
0 1 0 9
U
values for the transistor Q1 can
. – .
W
U
ground plane and not shared with any other component,
except the R
nection. Recommended component placement is shown
in the Figure 11.
C
IN
GND
GND
V
IN
Figure 11. Recommended Component Placement
L1
L2
C
C
OUT1
OUT2
T
resistor, ensuring a clean, noise-free con-
1
2
3
4
5
11
10
9
8
7
6
R1
R
FB1
R2
R
T
CTRL1
CTRL2
34661 F10
34661f