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LT3497
APPLICATIONS INFORMATION
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, CAP2, LED1 and LED2) away from
VIA TO
GROUND PLANE
C OUT2
the switching node. Place the output capacitors (C OUT1
and C OUT2 ) next to the output pins (CAP1 and CAP2).
The placement of a bypass capacitor on V IN needs to be
in close proximity to the IC to ?lter EMI noise from SW1
and SW2. Always use a ground plane under the switching
regulator to minimize interplane coupling. Recommended
component placement is shown in Figure 12.
SW2
L2
CAP2
10
LED2
5
CTRL2
VIA TO
GROUND
C IN
V IN
9
8
4
3
GND
PLANE
L1
SW1
CAP1
7
6
2
1
LED1
CTRL1
C OUT1
3497 F12
VIAS TO
GROUND PLANE
Figure 12. Recommended Component Placement
TYPICAL APPLICATIONS
Li-Ion to 1/2 White LEDs
V IN
3V TO 5V
Conversion Ef?ciency
C1
C2
C3
1 μ F
70
V IN = 3.6V
65 1/2LEDs
1 μ F
L1
10 μ H
L2
10 μ H
1 μ F
60
55
SW1
V IN
SW2
CAP1
CAP2
50
R SENSE1
10 ?
LT3497
LED1 LED2
R SENSE2
10 ?
3497 TA02a
45
40
CTRL1 GND CTRL2
35
OFF ON
OFF ON
SHUTDOWN
AND DIMMING
SHUTDOWN
AND DIMMING
30
0
5
10
15
20
CONTROL 1
CONTROL 2
LED CURRENT (mA)
C1, C2: TAIYO YUDEN GMK212BJ105KG
3497 TA02b
C3: TAIYO YUDEN LMK212BJ105MG
L1, L2: MURATA LQH32CN100K53
3497f
14
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