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LT3465/LT3465A
APPLICATIO S I FOR ATIO
skipping using a 1k resistor from FB to GND. The photo
in Figure 3b details circuit operation driving three white
LEDs at a 0.2mA load. Peak inductor current is less
than 30mA.
Inductor Selection
A 22 μ H inductor is recommended for most LT3465 appli-
cations. Although small size and high efficiency are major
concerns, the inductor should have low core losses at
85
80
75
70
65
60
55
V IN = 3.6V
4 LEDs
MURATA LQH32CN220
TAIYO YUDEN LB2012B220M
TAIYO YUDEN CB2012B220
1.2MHz and low DCR (copper wire resistance). Some
inductors in this category with small size are listed in
50
0
5
10
LED CURRENT (mA)
15
20
Table 1. The efficiency comparison of different inductors
is shown in Figure 4a. A 22 μ H or 10 μ H inductor is recom-
mended for most LT3465A applications. The inductor
3465A F04b
Figure 4a. Efficiency Comparison of Different Inductors (LT3465)
should have low core losses at 2.4MHz and low DCR. The
efficiency comparison of different inductors is shown in
figure 4b.
Table 1. Recommended Inductors
PART
CURRENT RATING
80
75
70
V IN = 3.6V
4 LEDs
NUMBER
DCR ( ? )
(mA)
MANUFACTURER
65
LQH32CN220
LQH2MCN220
0.71
2.4
250
185
Murata
814-237-1431
60
MURATA LQH32CN220
MURATA LQH32CN100
www.murata.com
55
MURATA LQH2MCN220
TOKO D312-220
ELJPC220KF
4.0
160
Panasonic
714-373-7334
50
TOKO D312-100
TAIYO YUDEN LB2012B220
www.panasonic.com
0
5
10
15
20
CDRH3D16-220
0.53
350
Sumida
847-956-0666
LED CURRENT (mA)
3465A F04b
www.sumida.com
Figure 4b. Efficiency Comparison of Different Inductors (LT3465A)
LB2012B220M
1.7
75
Taiyo Yuden
408-573-4150
www.t-yuden.com
Capacitor Selection
LEM2520-220
5.5
125
Taiyo Yuden
The small size of ceramic capacitors makes them ideal for
408-573-4150
www.t-yuden.com
LT3465 and LT3465A applications. X5R and X7R types are
recommended because they retain their capacitance over
wider voltage and temperature ranges than other types
such as Y5V or Z5U. A 1 μ F input capacitor and a 0.22 μ F
output capacitor are sufficient for most LT3465 and
LT3465A applications.
Table 2. Recommended Ceramic Capacitor Manufacturers
MANUFACTURER
Taiyo Yuden
Murata
Kemet
PHONE
408-573-4150
814-237-1431
408-986-0424
URL
www.t-yuden.com
www.murata.com
www.kemet.com
3465afa
8
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