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LT3486
APPLICATIONS INFORMATION
90
80
V IN = 5V
8/8 LEDs
R T = 63.4k
Several inductors that work well with the LT3486 are listed
in Table 1. Consult each manufacturer for more detailed
information and for their entire selection of related parts.
70
60
50
40
R T = 21.5k
R T = 39.1k
Table 1. Recommended Inductors
MAX
L DCR
PART (μH) (Ω)
LQH55DN150M 15 0.150
LQH55DN220M 22 0.190
CURRENT
RATING
(A)
1.40
1.20
VENDOR
Murata
(814) 237-1431
www.murata.com
30
0 5 10 15 20 25
LED CURRENT (mA)
3486 F06b
Figure 6b. Efficiency Comparison for Different R T Resistors
A915AY-4R7M
A915AY-6R8M
A915AY-100M
A918CY-100M
A918CY-150M
4.7
6.8
10
10
15
0.045
0.068
0.090
0.098
0.149
2.49
2.01
1.77
1.22
0.94
Toko
(847) 297-0070
www.toko.com
V IN ( MIN ) ? ( V OUT ( MAX ) – V IN ( MIN ) )
I L =
InductorSelection
The choice of the inductor will depend on the selection of
switching frequency of LT3486. The switching frequency
can be programmed from 200kHz to 2.5MHz. Higher
switching frequency allows the use of smaller inductors
albeit at the cost of increased switching losses.
The inductor current ripple (?I L ), neglecting the drop
across the Schottky diode and the switch, is given by:
V OUT ( MAX ) ? f ? L
where:
L = Inductor
f = Operating frequency
V IN(MIN) = Minimum input voltage
V OUT(MAX) = Maximum output voltage
The ?I L is typically set to 20% to 40% of the maximum
inductor current.
The inductor should have a saturation current rating greater
than the peak inductor current required for the application.
Also, ensure that the inductor has a low DCR (copper wire
resistance) to minimize I 2 R power losses. Recommended
inductor values range from 4.7μH to 22μH.
CDRH4D28-100 10 0.048 1.30 Sumida
CDRH5D18-150 15 0.145 0.97 (847) 956-0666
www.sumida.com
Capacitor Selection
The small size of ceramic capacitors make them ideal
for LT3486 applications. Use only X5R and X7R types
because they retain their capacitance over wider voltage
and temperature ranges than other types such as Y5V
or Z5U. A 4.7μF or larger input capacitor is sufficient for
most applications. Always use a capacitor with sufficient
voltage rating.
Table 2 shows a list of several ceramic capacitor manufac-
turers. Consult the manufacturers for detailed information
on their entire selection of ceramic parts.
Table 2. Ceramic Capacitor Manufacturers
Taiyo Yuden (408) 573-4150
www.t-yuden.com
AVX (803) 448-9411
www.avxcorp.com
Murata (714) 852-2001
www.murata.com
Diode Selection
Schottky diodes with their low forward voltage drop and
fast reverse recovery, are the ideal choices for LT3486
applications. The diode conducts current only during the
switch off time. The peak reverse voltage that the diode
must withstand is equal to the regulator output voltage.
3486fe
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