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LTM4614IV#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTM4614
13
4614fb
applicaTions inForMaTion
Table 2. 1.2V Output
DERATING CURVE V
IN
(V) POWER LOSS CURVE AIRFLOW (LFM) HEAT SINK
θ
JA
(°C/W)
Figure 7 5 Figure 5 0 None 15
Figure 7 5 Figure 5 200 None 12
Figure 7 5 Figure 5 400 None 10
Figure 8 5 Figure 5 0 BGA Heat Sink 12
Figure 8 5 Figure 5 200 BGA Heat Sink 9
Figure 8 5 Figure 5 400 BGA Heat Sink 7
Table 3. 3.3V Output
DERATING CURVE V
IN
(V) POWER LOSS CURVE AIRFLOW (LFM) HEAT SINK
θ
JA
(°C/W)
Figure 9 5 Figure 6 0 None 15
Figure 9 5 Figure 6 200 None 12
Figure 9 5 Figure 6 400 None 10
Figure 10 5 Figure 6 0 BGA Heat Sink 12
Figure 10 5 Figure 6 200 BGA Heat Sink 9
Figure 10 5 Figure 6 400 BGA Heat Sink 7
HEAT SINK MANUFACTURER PART NUMBER WEBSITE
Aavid Thermalloy 375424b00034G
www.aavid.com
LTM4614
14
4614fb
applicaTions inForMaTion
Figure 11. Recommended PCB Layout
M
C
IN1
GND1
GND2
GND1
V
IN1
GND1
GND2
GND2 GND2
GND1
V
OUT2
V
OUT1
V
IN2
GND2
4614 F11
V
OUT1
L
K
J
H
G
F
E
D
C
B
A
1 2 3 4 5 6 7 8 9 10 11 12
C
IN2
C
OUT3
C
OUT4
C
OUT1
C
OUT2
I/O PINS
I/O PINS
Safety Considerations
The LTM4614 modules do not provide galvanic isolation
from V
IN
to V
OUT
. There is no internal fuse. If required,
a slow blow fuse with a rating twice the maximum input
current needs to be provided to protect each unit from
catastrophic failure.
Layout Checklist/Example
The high integration of LTM4614 makes the PCB board
layout very simple and easy. However, to optimize its
electrical and thermal performance, some layout consid-
erations are still necessary.
• Refer to http://www.linear.com/docs/29812 for device
land pattern and stencil design.
• Use large PCB copper areas for high current paths,
including V
IN
, GND and V
OUT
. It helps to minimize the
PCB conduction loss and thermal stress.
• Place high frequency ceramic input and output capaci-
tors next to the V
IN
, GND and V
OUT
pins to minimize
high frequency noise.
• Place a dedicated power ground layer underneath the
unit.
• To minimize the via conduction loss and reduce module
thermal stress, use multiple vias for interconnection
between the top layer and other power layers.
• Do not put vias directly on pads unless they are capped.
Figure 11 gives a good example of the recommended layout.
LTM4614
15
4614fb
applicaTions inForMaTion
Figure 12. Typical 2.375V
IN
to 5.5V
IN
, 1.2V and 1V at 4A
Table 4. Output Voltage Response vs Component Matrix (Refer to Figure 12) 0A to 2.5A Load Step Typical Measured Values
C
OUT1
AND C
OUT2
CERAMIC VENDORS VALUE PART NUMBER C
OUT1
AND C
OUT2
BULK VENDORS VALUE PART NUMBER
TDK 22µF 6.3V C3216X7SOJ226M Sanyo POSCAP 150µF 10V 10TPD150M
Murata 22µF 16V GRM31CR61C226KE15L Sanyo POSCAP 220µF 4V 4TPE220MF
TDK 100µF 6.3V C4532X5R0J107MZ C
IN
BULK VENDORS VALUE PART NUMBER
Murata 100µF 6.3V GRM32ER60J107M SUNCON 100µF 10V 10CE100FH
V
OUT
(V)
C
IN
(CERAMIC)
C
IN
(BULK)*
C
OUT1
AND C
OUT2
(CER) EACH
C
OUT1
AND C
OUT2
(POSCAP) EACH
I
TH
V
IN
(V)
DROOP
(mV)
PEAK-TO-PEAK
DEVIATION
RECOVERY
TIME (µs)
LOAD STEP
(A/µs)
R
FB
(kΩ)
1.2
10µF ×2
100µF
100µF, 22µF ×2
None None 5 33 68 11 2.5 10
1.2
10µF ×2
100µF
22µF ×1
220µF None 5 25 50 9 2.5 10
1.2
10µF ×2
100µF
100µF, 22µF ×2
None None 3.3 33 68 8 2.5 10
1.2
10µF ×2
100µF
22µF ×1
220µF None 3.3 25 50 10 2.5 10
1.5
10µF ×2
100µF
100µF, 22µF ×2
None None 5 30 60 11 2.5 5.76
1.5
10µF ×2
100µF
22µF ×1
220µF None 5 28 60 11 2.5 5.76
1.5
10µF ×2
100µF
100µF, 22µF ×2
None None 3.3 30 60 10 2.5 5.76
1.5
10µF ×2
100µF
22µF ×1
220µF None 3.3 27 56 10 2.5 5.76
1.8
10µF ×2
100µF
100µF, 22µF ×2
None None 5 34 68 12 2.5 3.92
1.8
10µF ×2
100µF
22µF ×1
220µF None 5 30 60 12 2.5 3.92
1.8
10µF ×2
100µF
22µF ×1
220µF None 3.3 30 60 12 2.5 3.92
2.5
10µF ×2
None
22µF ×1
None None 5 50 90 10 2.5 2.37
2.5
10µF ×2
100µF
22µF ×1
150µF None 5 33 60 10 2.5 2.37
2.5
10µF ×2
100µF
22µF ×1
150µF None 3.3 50 95 12 2.5 2.37
3.3
10µF
×2
100µF
22µF ×1
150µF None 5 50 90 12 2.5 1.62
*Bulk capacitance is optional if V
IN
has very low input impedance.
4614 F12
PGOOD1
V
OUT1
FB1
COMP1
TRACK1
RUN/SS1
PGOOD2
V
OUT2
FB2
COMP2
TRACK2
RUN/SS2
LTM4614
V
IN1
V
IN2
GND1 GND2
R2
10k
V
IN
V
IN
C4
100µF
6.3V
C5
100µF
6.3V
C3
470µF
1V
4A
1.2V
4A
C6
22µF
6.3V
C2
22µF
6.3V
X5R OR X7R
C1
22µF
6.3V
V
IN
2.375V TO 5.5V
R1
20k
C
SSEXT1
0.1µF
+
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTM4614IV#PBF

Mfr. #:
Buy LTM4614IV#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual 2.375VIN, 4A Step-down Module Regulator with Tracking
Lifecycle:
New from this manufacturer.
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