LT3591 查看數據表（PDF） - Linear Technology
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LT3591 Datasheet PDF : 16 Pages
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LT3591
APPLICATIONS INFORMATION
INDUCTOR SELECTION
A 22µH inductor is recommended for most LT3591 ap-
plications. Although small size and high efficiency 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
efficiency comparison of different inductors is shown in
Figure 3.
Table 1. Recommended Inductors
PART
CURRENT
L RATING
(µH) (mA)
MAX
DIMENSION
L×W×H
(mm)
VENDOR
VLF4012AT-
220MR51
22
510
4 × 3.8 × 1.2 TDK
www.tdk.com
VLCF4018T-
220MR49-2
22
490 4.1 × 4.1 × 1.8
VLCF4020T-
220MR56
22
560
4.1 × 4.1 × 2
LQH43CN220K03 22
420 4.8 × 3.4 × 2.8 Murata
www.murata.com
NR4018T220M
22
590 4.2 × 4.2 × 1.8 Taiyo Yuden
www.t-yuden.com
NR4012T220M
22
510 4.2 × 4.2 × 1.2
CDRH3D18-
220NC
22 600
4 × 4 × 2 Sumida
www.sumida.com
B82470-A1223-M 22
480 4.8 × 4.8 × 1.2 Epcos
www.epcos.com
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 sufficient
for most applications.
A limited number of manufacturers produce small 50V
capacitors. Table 2 shows a list of several recommended
50V capacitors. Consult the manufacturer for detailed
information on their entire selection of ceramic parts.
Table 2. Recommended Output Capacitors
VOLTAGE CASE SIZE
PART
C
HEIGHT
(µF) TEMP. (mm) VENDOR
GRM21BR71H105KA12L 1
50V
0805 Murata
X7R 1.25 ± 0.15 www.murata.com
GRM31MR71H105KA88 1 50V
1206
X7R 1.15 ± 0.1
GRM31CR71H225KA88 2.2 50V
1206
X7R 1.6 ± 0.2
GRM31CR71H475KA12L 4.7 50V
1206
X7R 1.6 ± 0.2
UMK316BJ475KL-T
4.7 50V
1206 Taiyo Yuden
X7R 1.6 ± 0.2 www.t-yuden.com
85
VIN = 3.6V
80 10 LEDs
75
70
TAIYO YUDEN NR4018T220M
65
TDK VLCF4018T-220MR49-2
TAIYO YUDEN NR4012T220M
60
TDKVLCF4012AT-220MR51
MURATA LQH43CN220K03
TDK VLCF4020T-220MR56
55
SUMIDA CDRH3D18-220NC
EPCOS B82470-A1223-M
50
0
5
10
15
20
LED CURRENT (mA)
3591 F03
Figure 3. Efficiency Comparison of Different Inductors
3591f
7
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