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LTC3417AEDHC-1-TRPBF Datasheet(PDF) 10 Page - Linear Technology

Part # LTC3417AEDHC-1-TRPBF
Description  Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator with POR
Download  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3417AEDHC-1-TRPBF Datasheet(HTML) 10 Page - Linear Technology

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LTC3417A-1
10
3417a1fa
A reasonable starting point for setting ripple current is
ΔIL = 0.35ILOAD(MAX), where ILOAD(MAX) is the maximum
current output. The largest ripple, ΔIL, occurs at the maxi-
mum input voltage. To guarantee that the ripple current
stays below a specified maximum, the inductor value
should be chosen according to the following equation:
L
=
VOUT
fO • IL
1–
VOUT
VIN(MAX)
The inductor value will also have an effect on Burst Mode
operation. The transition from low current operation begins
when the peak inductor current falls below a level set by the
burst clamp. Lower inductor values result in higher ripple
current which causes this to occur at lower load currents.
This causes a dip in efficiency in the upper range of low
current operation. In Burst Mode operation, lower inductor
values will cause the burst frequency to increase.
Inductor Core Selection
Different core materials and shapes will change the size/
current relationship of an inductor. Toroid or shielded
pot cores in ferrite or permalloy materials are small and
don’t radiate much energy, but generally cost more than
powdered iron core inductors with similar electrical
characteristics. The choice of which style inductor to use
often depends more on the price vs size requirements
of any radiated field/EMI requirements than on what the
LTC3417A-1 requires to operate. Table 1 shows some
typical surface mount inductors that work well in
LTC3417A-1 applications.
Input Capacitor (CIN) Selection
In continuous mode, the input current of the converter can
be approximated by the sum of two square waves with
duty cycles of approximately VOUT1/VIN and VOUT2/VIN. To
prevent large voltage transients, a low equivalent series
resistance (ESR) input capacitor sized for the maximum
RMS current must be used. Some capacitors have a
de-rating spec for maximum RMS current. If the capaci-
tor being used has this requirement, it is necessary to
calculate the maximum RMS current. The RMS current
calculation is different if the part is used in “in phase” or
“out of phase”.
For “in phase”, there are two different equations:
VOUT1 > VOUT2:
VOUT2 > VOUT1:
IRMS = 2•I1 •I2 •D1(1–D2)+I2
2(D2 –D22)+I
1
2(D1–D12)
where:
D1=
VOUT1
VIN
and D2 =
VOUT2
VIN
Table 1
MANUFACTURER
PART NUMBER
VALUE (μH)
MAX DC CURRENT (A)
DCR
DIMENSIONS L × W × H (mm)
L1 on OT1
Toko
A920CY-1R5M-D62CB
A918CY-1R5M-D62LCB
1.5
1.5
2.8
2.9
0.014
0.018
6 × 6 × 2.5
6 × 6 × 2
Coilcraft
D01608C-152ML
1.5
2.6
0.06
6.6 × 4.5 × 2.9
Sumida
CDRH4D22/HP 1R5
1.5
3.9
0.031
5 × 5 × 2.4
Midcom
DUP-1813-1R4R
1.4
5.5
0.033
4.3 × 4.8 × 3.5
L2 on OUT2
Toko
A915AY-2ROM-D53LC
2.0
3.9
0.027
5 × 5 × 3
Coilcraft
D01608C-222ML
2.2
2.3
0.07
6.6 × 4.5 × 2.9
Sumida
CDRH3D16/HP 2R2
2.2
2.2
1.75
1.6
0.047
0.035
4 × 4 × 1.8
3.2 × 3.2 × 2
Midcom
DUP-1813-2R2R
2.2
3.9
0.047
4.3 × 4.8 × 3.5
APPLICATIONS INFORMATION
IRMS = 2•I1 •I2 •D2(1–D1)+I2
2(D2 –D22)+I
1
2(D1–D12)


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