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ManualsBrandsLinear Technology ManualsDC / DC Adjustable Switching RegulatorsSwitching Regulator IC Step-Down BGA-600 ... 5.5V
21222324252627282930
LTM4644/LTM4644-1
24
Rev. F
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APPLICATIONS INFORMATION
Table 3. 1.0V Output
DERATING CURVE V
IN
(V) POWER LOSS CURVE AIR FLOW (LFM) HEAT SINK Θ
JA
(°C/W)
Figures 16, 17 5, 12 Figure 9 0 None 12.5
Figures 16, 17 5, 12 Figure 9 200 None 11
Figures 16, 17 5, 12 Figure 9 400 None 10
Figures 18, 19 5, 12 Figure 9 0 BGA Heat Sink 11
Figures 18, 19 5, 12 Figure 9 200 BGA Heat Sink 9
Figures 18, 19 5, 12 Figure 9 400 BGA Heat Sink 8
Table 4. 1.5V Output
DERATING CURVE V
IN
(V) POWER LOSS CURVE AIR FLOW (LFM) HEAT SINK Θ
JA
(°C/W)
Figures 20, 21 5, 12 Figure 11 0 None 12.5
Figures 20, 21 5, 12 Figure 11 200 None 11
Figures 20, 21 5, 12 Figure 11 400 None 10
Figures 22, 23 5, 12 Figure 11 0 BGA Heat Sink 11
Figures 22, 23 5, 12 Figure 11 200 BGA Heat Sink 9
Figures 22, 23 5, 12 Figure 11 400 BGA Heat Sink 8
Table 5. 3.3V Output
DERATING CURVE V
IN
(V) POWER LOSS CURVE AIR FLOW (LFM) HEAT SINK Θ
JA
(°C/W)
Figures 24, 25 5, 12 Figure 14 0 None 12.5
Figures 24, 25 5, 12 Figure 14 200 None 11
Figures 24, 25 5, 12 Figure 14 400 None 10
Figures 26, 27 5, 12 Figure 14 0 BGA Heat Sink 11
Figures 26, 27 5, 12 Figure 14 200 BGA Heat Sink 9
Figures 26, 27 5, 12 Figure 14 400 BGA Heat Sink 8
Table 6. 5V Output
DERATING CURVE V
IN
(V) POWER LOSS CURVE AIR FLOW (LFM) HEAT SINK Θ
JA
(°C/W)
Figures 26, 27 12 Figure 15 0 None 12.5
Figures 26, 27 12 Figure 15 200 None 11
Figures 26, 27 12 Figure 15 400 None 10
Figures 28, 29 12 Figure 15 0 BGA Heat Sink 11
Figures 28, 29 12 Figure 15 200 BGA Heat Sink 9
Figures 28, 29 12 Figure 15 400 BGA Heat Sink 8
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