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BD3531F Datasheet(PDF) 9 Page - Rohm

No. de pieza BD3531F
Descripción Electrónicos  Termination Regulator for DDR-SDRAMs
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Fabricante Electrónico  ROHM [Rohm]
Página de inicio  http://www.rohm.com
Logo ROHM - Rohm

BD3531F Datasheet(HTML) 9 Page - Rohm

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BD3531F
9/15
© 2015 ROHM Co., Ltd. All rights reserved.
www.rohm.com
TSZ22111・15・001
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
2.
Power Dissipation
In thermal design, consider the temperature range wherein the IC is guaranteed to operate and apply appropriate
margins. The temperature conditions that need to be considered are listed below:
(1) Ambient temperature Ta: 100°C or lower
(2) Chip junction temperature Tj: 150°C or lower
The chip
’s junction temperature Tj can be considered as follows. (See the diagrams below for θja.)
Most heat loss in BD3531F occurs at the output N-channel FET. The lost power
is determined by multiplying the
voltage between IN and OUT by the output current. Since this IC is packaged for high-power applications, its thermal
derating characteristics significantly depend on the PCB. So when designing, the size of the PCB to be used should be
carefully considered.
Power dissipation (W) = {Input voltage (VVTT_IN)
– Output voltage (VVTT=1/2VVDDQ)} x IOUT (Ave)
For instance, VVTT_IN = 1.8V, VVDDQ=1.8V, and IOUT (Ave)=0.5A
The power dissipation is determined as follows:
 
 
 
 
 
W
4
.
0
A
5
.
0
V
9
.
0
V
8
.
1
W
n
dissipatio
Power
◎SOP8
(1) 70mm x 70mm x 1.6mm Glass-epoxy PCB
θj-c=181°C/W
(2) With no heat sink
θj-a=222°C/W
Ambient Temperature [Ta]
100°C
100
0.6
0
25
75
125
150
50
0.2
0.1
0
[°C]
0.4
0.5
0.3
[W]
(2) 0.56W
(1) 0.69W
0.7


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