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BD35390FJ датащи(PDF) 7 Page - Rohm

номер детали BD35390FJ
подробное описание детали  Termination Regulator for DDR-SDRAMs
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производитель  ROHM [Rohm]
домашняя страница  http://www.rohm.com
Logo ROHM - Rohm

BD35390FJ датащи(HTML) 7 Page - Rohm

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BD35390FJ
Technical Note
7/10
www.rohm.com
2009.10 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
Heat loss
Thermal design must be conducted with the operation under the conditions listed below (which are the guaranteed
temperature range requiring consideration on appropriate margins etc);
1: Ambient temperature Ta: 100℃ or lower
2:Chip junction temperature Tj: 150℃ or lower
The chip junction temperature Tj can be considered as follows:
Most of heat loss in BD35390FJ occurs at the output N-channel FET. The power lost is determined by multiplying the
voltage between VIN and Vo by the output current. As this IC employs the power PKG, the thermal derating characteristics
significantly depends on the pc board conditions. When designing, care must be taken to the size of a pc board to be used.
Power consumption (W) = Input voltage (VTT_IN)-Output voltage (VTT≒1/2VDDQ) ×Io(Ave)
Example) Where VTT_IN =1.8V, VDDQ=1.8V, Io(Ave)= 0.5A
= 0.45(W)
Heat dissipation characteristics
Power consumption(W) = 1.8(V)-0.9(V) ×0.5(A)
(1) mounted on 70mm×70mm×1.6mm glass-epoxy board
θ
j-c=185.2℃/W
(2) With no heat sink
θ
j-a=222.2℃/W
600
0
25
75
100
125
150
50
200
100
0
[℃]
400
500
300
[mW]
(2) 563mW
100℃
(1) 675mW
700
Ambient temperature [Ta]


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