LTM4682 datasheet(71/130 Pages) AD

71 / 130 page

LTM4682

Rev. A

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APPLICATIONS INFORMATION

in the Pin Configuration section. Table 10, Table 11, and

Table 12 provide equivalent thermal resistances for 0.75V,

1V, and 1.35V outputs with and without airflow. The

derived thermal resistances in Table 10 through Table 12

for the various conditions can be multiplied by the calcu-

lated 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 multiplicative factors.

Table 10 through Table 12: Output Current Derating

Table 10. 0.75V 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

4.4

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. 1V 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

4.4

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. 1.35V 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

4.4

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

Figure 44. 5VIN to 1.35VOUT

Derating Curve, No Heat Sink

Figure 45. 8VIN to 1.35VOUT

Derating Curve, No Heat Sink

Figure 46. 12VIN to 1.35VOUT

Derating Curve, No Heat Sink

0LFM

200LFM

400LFM

TEMPERATURE (°C)

100

120

100

120

140

4682 F44

0LFM

200LFM

400LFM

TEMPERATURE (°C)

100

120

100

120

140

4682 F45

0LFM

200LFM

400LFM

TEMPERATURE (°C)

100

120

100

120

140

4682 F38

LTM4682 Datasheet(PDF) 71 Page - Analog Devices

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