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LT3591 Datasheet(PDF) 7 Page - Linear Technology

Part # LT3591
Description  White LED Driver with Integrated Schottky
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3591 Datasheet(HTML) 7 Page - Linear Technology

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LT3591
7
3591f
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
L
(µH)
CURRENT
RATING
(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
APPLICATIONS INFORMATION
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
PART
C
(µF)
VOLTAGE CASE SIZE
VENDOR
TEMP.
HEIGHT
(mm)
GRM21BR71H105KA12L
1
50V
0805
Murata
www.murata.com
X7R
1.25 ± 0.15
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
www.t-yuden.com
X7R
1.6 ± 0.2
Figure 3. Efficiency Comparison of Different Inductors
LED CURRENT (mA)
0
50
55
85
80
65
5
10
3591 F03
70
75
60
15
20
TAIYO YUDEN NR4018T220M
TDK VLCF4018T-220MR49-2
TAIYO YUDEN NR4012T220M
TDKVLCF4012AT-220MR51
MURATA LQH43CN220K03
TDK VLCF4020T-220MR56
SUMIDA CDRH3D18-220NC
EPCOS B82470-A1223-M
VIN = 3.6V
10 LEDs



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