LTM4673 datasheet(71/132 Pages) AD

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LTM4683

Rev. 0

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Figure 44. 5VIN to 0.7VOUT

Derating Curve, No Heat Sink

0LFM

200LFM

400LFM

TAMB (°C)

100

120

100

120

140

4683 F44

0LFM

200LFM

400LFM

TAMB (°C)

100

120

100

120

140

4683 F45

0LFM

200LFM

400LFM

TAMB (°C)

100

120

100

120

140

4683 F46

Figure 45. 8VIN to 0.7VOUT

Derating Curve, No Heat Sink

Figure 46. 12VIN to 0.7VOUT

Derating Curve, No Heat Sink

APPLICATIONS INFORMATION

power loss curve at 84A (See Figure 37), with the 1.35

multiplying factor. If the 76°C ambient temperature is

subtracted from the 125°C junction temperature, then

the difference of °C divided by 12.56W yields a thermal

resistance, θJA, of ~4°C/W—in good agreement with the

value derived from thermal simulation shown in the Pin

Configuration section. Table 10–Table 12 provide equiva-

lent thermal resistances for 0.4V, 0.6V and 0.7V outputs

with and without airflow.

Table 10– Table 12 for the various conditions can be multi-

plied by the calculated power loss as a function of ambient

temperature to derive temperature rise above ambient,

thus maximum junction temperature. Room temperature

power loss can be derived from the efficiency curves

in the Typical Performance Characteristics section and

adjusted with the above ambient temperature multiplica-

tive factors.

Table 10. 0.4V Output

DERATING CURVE

VIN (V)

POWER LOSS CURVE

AIRFLOW (LFM)

HEAT SINK

θJA (°C/W)

Figure 38 to Figure 40

5, 8, 12

Figure 35 to Figure 37

None

4.25

Figure 38 to Figure 40

5, 8, 12

Figure 35 to Figure 37

200

None

Figure 38 to Figure 40

5, 8, 12

Figure 35 to Figure 37

400

None

Table 11. 0.6V Output

DERATING CURVE

VIN (V)

POWER LOSS CURVE

AIRFLOW (LFM)

HEAT SINK

θJA (°C/W)

Figure 41 to Figure 43

5, 8, 12

Figure 35 to Figure 37

None

4.25

Figure 41 to Figure 43

5, 8, 12

Figure 35 to Figure 37

200

None

Figure 41 to Figure 43

5, 8, 12

Figure 35 to Figure 37

400

None

Table 12. 0.7V Output

DERATING CURVE

VIN (V)

POWER LOSS CURVE

AIRFLOW (LFM)

HEAT SINK

θJA (°C/W)

Figure 44 to Figure 46

5, 8, 12

Figure 35 to Figure 37

None

4.25

Figure 44 to Figure 46

5, 8, 12

Figure 35 to Figure 37

200

None

Figure 44 to Figure 46

5, 8, 12

Figure 35 to Figure 37

400

None

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