LTC3417AIFE#TRPBF Linear Technology, LTC3417AIFE#TRPBF Datasheet - Page 10

• Manufacturer Part Number: LTC3417AIFE#TRPBF
• Description: IC DC/DC CONV DUAL 20TSSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC3417AIFE#TRPBF

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 5 V
• Current - Output: 1A, 1.5A
• Frequency - Switching: 1.5MHz, 0.6MHz ~ 4MHz
• Voltage - Input: 2.25 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

APPLICATIONS INFORMATION
LTC3417A
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 fi eld/EMI requirements than on what the
LTC3417A requires to operate. Table 1 shows some
typical surface mount inductors that work well in
LTC3417A applications.
Input Capacitor (C
In continuous mode, the input current of the converter can
be approximated by the sum of two square waves with
duty cycles of approximately V
prevent large voltage transients, a low equivalent series
resistance (ESR) input capacitor sized for the maximum
Table 1
MANUFACTURER
L1 on OUT1
Toko
Coilcraft
Sumida
Midcom
L2 on OUT2
Toko
Coilcraft
Sumida
Midcom
10
IN
PART NUMBER
A920CY-1R5M-D62CB
A918CY-1R5M-D62LCB
DO1608C-152ML
CDRH4D22/HP 1R5
DUP-1813-1R4R
A915AY-2R0M-D53LC
DO1608C-222ML
CDRH3D16/HP 2R2
CDRH2D18/HP 2R2
DUP-1813-2R2R
) Selection
OUT1
/V
IN
and V
OUT2
VALUE (μH)
/V
1.5
1.5
1.5
1.5
1.4
2.0
2.2
2.2
2.2
2.2
IN
. To
MAX DC CURRENT (A)
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:
V
V
where:
I
I
RMS
RMS
OUT1
OUT2
D1=
= 2 •I
= 2 •I
1.75
> V
> V
2.8
2.9
2.6
3.9
5.5
3.9
2.3
1.6
3.9
V
OUT1
V
OUT2
OUT1
IN
1
1
•I
•I
:
:
2
2
and D2 =
• D2(1– D1) +I
• D1(1– D2) +I
0.014
0.018
0.031
0.033
0.027
0.047
0.035
0.047
DCR
0.06
0.07
V
OUT2
V
IN
2
2
DIMENSIONS L × W × H (mm)
6 × 6 × 2.5
6 × 6 × 2
6.6 × 4.5 × 2.9
5 × 5 × 2.4
4.3 × 4.8 × 3.5
5 × 5 × 3
6.6 × 4.5 × 2.9
4 × 4 × 1.8
3.2 × 3.2 × 2
4.3 × 4.8 × 3.5
2
2
(D2 – D2
(D2 – D2
2
2
) +I
) +I
1
1
2
2
(D1– D1
(D1– D1
3417afb
2
2
)
)