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LT3596
APPLICATIONS INFORMATION
Inductor Selection
Inductor values between 100μH and 470μH are recom-
mended for most applications. It is important to choose
an inductor that can handle the peak current without
saturating. The inductor DCR (copper wire resistance)
must also be low in order to minimize I 2 R power losses.
Table 1 lists several recommended inductors.
Table 1. Recommended I nductors
Typically 10μF capacitors are sufficient for the V IN and BIAS
pins. The output capacitor for the buck regulator depends
on the number of LEDs and switching frequency. Refer to
Table 3 for the proper output capacitor selection.
Table 3. Recommended Output Capacitor Values
(Volts/LED = 3.5V)
SWITCHING
FREQUENCY (kHz) # LEDs C OUT (μF)
1000 1 to 3 6.8
PART
MSS1038
MSS1038
MSS1246T
CDRH10D68
CDRH12D58R
DS1262C2
VLF10040
DR124
DR127
DR74
744771220
L
(μH)
100
220
470
100
220
470
100
220
100
220
100
220
470
100
220
MAX
DCR
(Ω)
0.3
0.76
0.935
0.205
0.362
0.67
0.17
0.35
0.22
0.47
0.26
0.56
0.861
0.383
0.40
CURRENT
RATING
(A)
1.46
0.99
1.0
1.5
1.0
1.01
1.5
1.0
1.3
0.9
1.79
1.15
1.6
0.99
1.2
VENDOR
Coilcraft
www.coilcraft.com
Sumida
www.sumida.com
Toko
www.toko.com
TDK
www.tdk.com
Coiltronics
www.cooperet.com
Würth Elektronik
www.we-online.com
>3 4.7
500 1 to 3 10
>3 6.8
200 1 to 3 22
>3 10
Diode Selection
Schottky diodes, with their low forward voltage drop and
fast switching speed, must be used for all LT3596 ap-
plications. Do not use P-N junction diodes. The diode’s
average current rating must exceed the application’s aver-
age current. The diode’s maximum reverse voltage must
exceed the application’s input voltage. Table 4 lists some
recommended Schottky diodes.
Table 4. Recommended Diodes
Capacitor Selection
Low ESR (equivalent series resistance) capacitors should
be used at the outputs to minimize output ripple voltage.
Use only X5R or X7R dielectrics, as these materials retain
their capacitance over wider voltage and temperature
ranges than other dielectrics. Table 2 lists some suggested
manufacturers. Consult the manufacturers for detailed
information on their entire selection of ceramic surface
mount parts.
MAX
MAX REVERSE
CURRENT VOLTAGE
PART (A) (V)
DFLS160 1 60
CMMSH1-60 1 60
ESIPB 1 100
Undervoltage Lockout (UVLO)
MANUFACTURER
Diodes, Inc.
www.diodes.com
Central Semiconductor
www.centralsemi.com
Vishay
www.vishay.com
Table 2. Recommended Ceramic Capacitor Manufacturers
Taiyo Yuden www.t-yuden.com
EN/UVLO programs the UVLO threshold by connecting the
pin to a resistor divider from V IN as shown in Figure 2.
AVX
www.avxcorp.com
Select R1 and R2 according to the following equation:
V IN ( UVLO ) = 1 . 51 V ? ? 1 +
Murata
Kemet
TDK
www.murata.com
www.kemet.com
www.tdk.com
?
?
R2 ?
R 1 ? ?
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