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LT3475/LT3475-1
APPLICATIONS INFORMATION
current have signi?cantly increased. Exceeding V IN(MAX)
Table 2. Inductors
is safe if the external components have adequate ratings
to handle the peak conditions and if the peak inductor
PART NUMBER
VALUE
( μ H)
I RMS
(A)
DCR
( )
HEIGHT
(mm)
current does not exceed 3.2A. A saturating inductor may
Sumida
further reduce performance.
V OUT
500mV/DIV
(AC COUPLED)
IL
1A/DIV
V SW
20V/DIV
3475 F04
Figure 4. Operation above V IN(MAX) . Output
Ripple and Peak Inductor Current Increases
CR43-3R3
CR43-4R7
CDRH4D16-3R3
CDRH4D28-3R3
CDRH4D28-4R7
CDRH6D26-5R0
CDRH6D26-5R6
CDRH5D28-100
CDRH5D28-150
CDRH73-100
CDRH73-150
CDRH104R-150
3.3
4.7
3.3
3.3
4.7
5.0
5.6
10
15
10
15
15
1.44
1.15
1.10
1.57
1.32
2.20
2.0
1.30
1.10
1.68
1.33
3.1
0.086
0.109
0.063
0.049
0.072
0.032
0.036
0.048
0.076
0.072
0.130
0.050
3.5
3.5
1.8
3.0
3.0
2.8
2.8
3.0
3.0
3.4
3.4
4.0
Coilcraft
Inductor Selection and Maximum Output Current
A good ?rst choice for the inductor value is:
DO1606T-332
DO1606T-472
DO1608C-332
3.3
4.7
3.3
1.30
1.10
2.00
0.100
0.120
0.080
2.0
2.0
2.9
L = (V OUT + V F ) ?
1.2MHz
f
DO1608C-472
MOS6020-332
4.7
3.3
1.50
1.80
0.090
0.046
2.9
2.0
where V F is the voltage drop of the catch diode (~0.4V),
f is the switching frequency and L is in μH. With this value
the maximum load current will be above 1.6A at all duty
MOS6020-472
DO3316P-103
DO3316P-153
10
10
15
1.50
3.9
3.1
0.050
0.038
0.046
2.0
5.2
5.2
cycles. The inductor’s RMS current rating must be greater
than the maximum load current and its saturation current
should be at least 30% higher. For highest ef?ciency,
the series resistance (DCR) should be less than 0.15Ω.
Table 2 lists several vendors and types that are suitable.
For robust operation at full load and high input voltages
(V IN > 30V), use an inductor with a saturation current
higher than 3.2A.
The optimum inductor for a given application may differ
from the one indicated by this simple design guide. A larger
value inductor provides a higher maximum load current, and
reduces the output voltage ripple. If your load is lower than
the maximum load current, then you can relax the value of the
inductor and operate with higher ripple current. This allows
you to use a physically smaller inductor, or one with a lower
DCR resulting in higher ef?ciency. In addition, low inductance
may result in discontinuous mode operation, which further
reduces maximum load current. For details of maximum
output current and discontinuous mode operation, see Linear
Technology’s Application Note 44. Finally, for duty cycles
greater than 50% (V OUT /V IN > 0.5), a minimum inductance
is required to avoid sub-harmonic oscillations:
L MIN = (V OUT + V F ) ?
800kHz
f
3475fb
10
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