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LTM4680 Datasheet(PDF) 23 Page - Analog Devices

Part # LTM4680
Description  Dual 25A or Single 50A μModule Regulator with Active Voltage Positioning
PDF  36 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTM4680 Datasheet(HTML) 23 Page - Analog Devices

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LTM4650-2
23
Rev. 0
For more information www.analog.com
The derating curves are plotted with CH1 and CH2 in
parallel single output operation starting at 50A of load
with low ambient temperature. The output voltages are
0.9V and 1.5V. These are chosen to include the lower
and higher output voltage ranges for correlating the ther-
mal resistance. Thermal models are derived from several
temperature measurements in a controlled temperature
chamber, along with thermal modeling analysis.
The junction temperatures are monitored while ambient
temperature is increased with and without airflow. The
power loss increase with ambient temperature change
is factored into the derating curves. The junctions are
maintained at ~120°C maximum while lowering output
current or power while increasing ambient temperature.
The decreased output current will decrease the internal
module loss as ambient temperature is increased.
The monitored junction temperature of 120°C minus the
ambient operating temperature specifies how much mod-
ule temperature rise can be allowed. As an example in
Figure 16, the load current is derated to ~35A at ~90°C
with 200LFM air, but not heat sink and the power loss
for the 12V to 0.9V at 35A output is a ~5.6W loss. The
5.6W loss is calculated with the ~4.7W room temperature
loss from the 12V to 0.9V power loss curve at 35A, and
the 1.20 multiplying factor at 120°C junction tempera-
ture. If the 90°C ambient temperature is subtracted from
APPLICATIONS INFORMATION
Figure 13. 0.9V Output Power
Loss Curve
Figure 14. 1.5V Output Power
Loss Curve
Figure 15. 5V to 0.9V
Derating Curve, No Heat Sink
LOAD CURRENT (A)
0
0
4
3
2
1
5
9
8
7
6
10
40
50
10
20
46502 F13
30
VIN = 5V
VIN = 12V
LOAD CURRENT (A)
0
0
4
3
2
1
5
9
8
7
6
10
40
50
10
20
46502 F14
30
VIN = 5V
VIN = 12V
AMBIENT TEMPERATURE (°C)
25
20
30
40
105
46502 F15
10
0
45
65
85
35
115
55
75
95
60
50
0LFM
200LFM
400LFM
Figure 16. 12V to 0.9V
Derating Curve, No Heat Sink
Figure 17. 5V to 0.9V Derating
Curve, BGA Heat Sink
AMBIENT TEMPERATURE (°C)
25
20
30
40
105
46502 F16
10
0
45
65
85
35
115
55
75
95
60
50
0LFM
200LFM
400LFM
AMBIENT TEMPERATURE (°C)
25
20
30
40
105
46502 F17
10
0
45
65
85
35
115
55
75
95
60
50
0LFM
200LFM
400LFM



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