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LT3496
APPLICATIONS INFORMATION
Table 1. Ceramic Capacitor Manufacturers
Table 2. Surface Mount Inductors
VENDOR
Taiyo Yuden
AVX
Murata
Kemet
TYPE
Ceramic
Ceramic
Ceramic
Ceramic
SERIES
X5R, X7R
X5R, X7R
X5R, X7R
X5R, X7R
PART NUMBER
Sumida
CMD4D06
CDRH3D16
VALUE
(μH)
2.2
3.3
2.2
DCR
( Ω MAX)
0.116
0.174
0.072
I RMS (A)
0.95
0.77
1.20
SIZE
W × L × H (mm3)
3.5 × 4.3 × 0.8
3.8 × 3.8 × 1.8
Inductor Selection
3.3
0.085
1.10
Several inductors that work well with the LT3496 are listed
in Table 2. However, there are many other manufacturers
and devices that can be used. Consult each manufacturer
for more detailed information and their entire range of
parts. Ferrite core inductors should be used to obtain the
best efficiency. Choose an inductor that can handle the
necessary peak current without saturating, and ensure that
the inductor has a low DCR (copper-wire resistance) to
minimize I 2 R power losses. An inductor with a magnetic
shield should be used to prevent noise radiation and cross
coupling among the three channels.
Diode Selection
The Schottky diode conducts current during the interval
when the switch is turned off. Select a diode V R rated
for the maximum SW voltage. It is not necessary that
the forward current rating of the diode equal the switch
current limit. The average current, I F , through the diode
is a function of the switch duty cycle. Select a diode with
forward current rating of:
CDRH4D28
CDRH5D28
CooperET
SD3112
SD14
SD20
SD25
Taiyo Yuden
NR3015
NP04SZB
4.7
10
15
22
33
2.2
3.3
4.7
10
15
22
33
2.2
4.7
4.7
10
15
22
0.105
0.128
0.149
0.122
0.189
0.140
0.165
0.246
0.2058
0.1655
0.2053
0.2149
0.06
0.12
0.075
0.100
0.180
0.210
0.90
1.00
0.76
0.9
0.75
0.97
0.90
0.74
1.1
1.25
1.12
1.11
1.48
1.02
1.6
1.2
0.95
0.77
5.0 × 5.0 × 3.0
6.0 × 6.0 × 3.0
3.1 × 3.1 × 1.2
5.0 × 5.0 × 1.4
5.0 × 5.0 × 2.0
5.0 × 5.0 × 2.5
3.0 × 3.0 × 1.5
4.0 × 4.0 × 1.8
I F = I L ? (1 – D)
where I L is the inductor current.
If using the PWM feature for dimming, it is important to
consider diode leakage, which increases with the tem-
perature from the output during the PWM low interval.
Therefore, choose the Schottky diode with sufficient low
leakage current. Table 3 shows several Schottky diodes
that work well with the LT3496.
Table 3. Schottky Diodes
PART NUMBER V R (V)
ZETEX
ZLLS350 40
ZLLS400 40
I F (A)
0.38
0.52
PACKAGE
SOD523
SOD323
3496ff
  
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