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LT3591
APPLICATIONS INFORMATION
INDUCTOR SELECTION
A 22μH inductor is recommended for most LT3591 ap-
plications. Although small size and high ef?ciency are
major concerns, the inductor should have low core losses
at 1MHz and low DCR (copper wire resistance). Some
small inductors in this category are listed in Table 1. The
ef?ciency comparison of different inductors is shown in
Figure 3.
Table 1. Recommended Inductors
CAPACITOR SELECTION
The small size of ceramic capacitors make them ideal for
LT3591 applications. Use only X5R and X7R types because
they retain their capacitance over wider temperature
ranges than other types such as Y5V or Z5U. A 1μF input
capacitor and a 50V, 2.2μF output capacitor are suf?cient
for most applications.
A limited number of manufacturers produce small 50V
capacitors. Table 2 shows a list of several recommended
L
CURRENT
RATING
MAX
DIMENSION
L × W × H
50V capacitors. Consult the manufacturer for detailed
information on their entire selection of ceramic parts.
PART
(μH)
(mA)
(mm)
VENDOR
Table 2. Recommended Output Capacitors
VLF4012AT-
220MR51
VLCF4018T-
220MR49-2
VLCF4020T-
220MR56
22
22
22
510
490
560
4 × 3.8 × 1.2 TDK
www.tdk.com
4.1 × 4.1 × 1.8
4.1 × 4.1 × 2
PART
GRM21BR71H105KA12L
C
(μF)
1
VOLTAGE CASE SIZE
HEIGHT
TEMP. (mm) VENDOR
50V 0805 Murata
X7R 1.25 ± 0.15 www.murata.com
LQH43CN220K03
NR4018T220M
NR4012T220M
22
22
22
420
590
510
4.8 × 3.4 × 2.8 Murata
www.murata.com
4.2 × 4.2 × 1.8 Taiyo Yuden
www.t-yuden.com
4.2 × 4.2 × 1.2
GRM31MR71H105KA88
GRM31CR71H225KA88
1
2.2
50V
X7R
50V
X7R
1206
1.15 ± 0.1
1206
1.6 ± 0.2
CDRH3D18-
220NC
22
600
4 × 4 × 2
Sumida
www.sumida.com
GRM31CR71H475KA12L 4.7
50V
X7R
1206
1.6 ± 0.2
B82470-A1223-M
22
480
4.8 × 4.8 × 1.2 Epcos
www.epcos.com
UMK316BJ475KL-T
4.7
50V
X7R
1206 Taiyo Yuden
1.6 ± 0.2 www.t-yuden.com
85
80
V IN = 3.6V
10 LEDs
75
70
TAIYO YUDEN NR4018T220M
65
60
55
TDK VLCF4018T-220MR49-2
TAIYO YUDEN NR4012T220M
TDKVLCF4012AT-220MR51
MURATA LQH43CN220K03
TDK VLCF4020T-220MR56
SUMIDA CDRH3D18-220NC
EPCOS B82470-A1223-M
50
0
5
10
15
20
LED CURRENT (mA)
3591 F03
Figure 3. Ef?ciency Comparison of Different Inductors
3591f
7
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