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LT3466
APPLICATIO S I FOR ATIO
Figure 9 shows four LEDs being powered off two AA cells.
The battery is connected to the inductors and the chip is
powered off 3.3V logic supply voltage.
BOARD LAYOUT CONSIDERATION
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
1 μ F
2 AA CELLS
1.8V to 3V
L1
15 μ H
SW1
V IN
L2
15 μ H
SW2
3.3V
0.1 μ F
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.
10 ?
1 μ F
V OUT1
FB1
CTRL1
LT3466
R T
V OUT2
FB2
CTRL2
1 μ F
10 ?
The exposed paddle for both DFN and TSSOP packages
must be connected to the system ground. The ground
connection for the feedback resistors should be tied
directly to the ground plane and not shared with any other
OFF ON
63.4k
OFF ON
3466 F09
component, except the R T resistor, ensuring a clean,
1%
noise-free connection. Recommended component place-
ment for the DFN package is shown in Figure 10.
Figure 9. 2 AA Cells to Four White LEDs
HIGH INPUT VOLTAGE APPLICATIONS
The input voltage to the LT3466 can be as high as 24V. This
gives it the flexibility of driving a large number of LEDs
GND
C OUT1
when being powered off a higher voltage. The maximum
number of LEDs that can be driven is constrained by the
C IN
L1
1
10
R FB1
R T
CTRL1
converter output voltages being clamped at 39.5V (typ).
2
9
The LT3466 can be used to drive 20 White LEDs (10 per
converter) at 20mA when powered off two Li-Ion cells in
series.
V IN
L2
3
4
5
11
8
7
6
R FB2
CTRL2
C OUT2
GND
3466 F10
Figure 10. Recommended Component Placement (DFN Package)
3466fa
13
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