DC1041A-A Linear Technology, DC1041A-A Datasheet - Page 16

• Manufacturer Part Number: DC1041A-A
• Description: BOARD EVAL LTM4601
• Manufacturer: Linear Technology
• Series: µModuler

Specifications of DC1041A-A

• Design Resources: LTM4601 Spice Model LTM4601 Gerber Files DC1041 Design File DC1041 Schematic
• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Power - Output: -
• Voltage - Output: 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V
• Current - Output: 12A
• Voltage - Input: 4.5 ~ 20V
• Regulator Topology: Buck
• Frequency - Switching: 850kHz
• Board Type: Fully Populated
• Utilized Ic / Part: LTM4601A
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

LTM4601/LTM4601-1
Thermal Considerations and Output Current Derating
The power loss curves in Figures 7 and 8 can be used
in coordination with the load current derating curves in
Figures 9 to 14 for calculating an approximate θ
module with various heat sinking methods. Thermal models
are derived from several temperature measurements at
the bench and thermal modeling analysis. Thermal Ap-
plication Note 103 provides a detailed explanation of the
analysis for the thermal models and the derating curves.
Tables 3 and 4 provide a summary of the equivalent θ
for the noted conditions. These equivalent θ
are correlated to the measured values, and are improved
with air fl ow. The case temperature is maintained at 100°C
APPLICATIONS INFORMATION
16
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
12
10
8
6
4
2
0
0
50
0
Figure 9. No Heat Sink 5V
Figure 7. 1.5V Power Loss
5V
5V
5V
60
2
AMBIENT TEMPERATURE (°C)
IN
IN
IN
, 1.5V
, 1.5V
, 1.5V
OUTPUT CURRENT (A)
12V LOSS
4
70
OUT
OUT
OUT
0LFM
200LFM
400LFM
20V LOSS
6
80
5V LOSS
8
90
10
IN
4600 F09
4601 F07
100
JA
12
parameters
JA
for the
JA
or below for the derating curves. The maximum case
temperature of 100°C is to allow for a rise of about 13°C
to 25°C inside the μModule with a thermal resistance θ
from junction to case between 6°C/W to 9°C/W. This will
maintain the maximum junction temperature inside the
μModule below 125°C.
Safety Considerations
The LTM4601 modules do not provide isolation from
V
slow blow fuse with a rating twice the maximum input
current needs to be provided to protect each unit from
catastrophic failure.
IN
to V
OUT
12
10
8
6
4
2
0
6
5
4
3
2
1
0
. There is no internal fuse. If required, a
50
0
Figure 10. BGA Heat Sink 5V
Figure 8. 3.3V Power Loss
5V
5V
5V
60
2
AMBIENT TEMPERATURE (°C)
IN
IN
IN
, 1.5V
, 1.5V
, 1.5V
OUTPUT CURRENT (A)
4
70
OUT
OUT
OUT
20V LOSS
0LFM
200LFM
400LFM
6
80
8
12V LOSS
90
10
4601 F10
4601 F08
IN
100
12
4601fb
JC