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BD3539FVM-TR

P1-P3P4-P6P7-P9P10-P12
BD3539FVM,BD3539NUX
Technical Note
10/11
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:
Because package with FIN is used at IC bottom side, package power changes considerably by copper foil area, which is
connected. Please radiate heat by taking enough area for board surface or using many through hole to inner layer pattern.
Most of heat loss in BD3539FVM/NUX 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 (V
TT_IN
)-Output voltage(V
TT
≒ VDDQ)×Io(Ave)
Example) Where V
TT_IN
=1.5V, VDDQ=1.5V, Io(Ave)= 0.5A
●Heat dissipation characteristics [Tc]
◎MSOP8
●Heat dissipation characteristics [Ta]
◎MSOP8 ◎VSON008X2030
①Calculation based on IC surface
temperature Tc, mounted on a board
Tj=Tc+θj-c×W
②Calculation based on ambient temperature Ta
Tj=Ta+θj-a×W
With no heat sink
1-layer board(copper foil area:70×70mm
2
)
4-layer board(copper foil area:70×70mm
2
)
PCB size: 70×70×1.6mm
3
(
with thermal via
)
θj-a:VSON008X2030 516.5℃/W
242.7℃/W
142.5℃/W
＜Reference example＞
θj-a:MSOP-8 212.8℃/W
322.6℃/W
With no heat sink
1-layer board(copper foil area :70×70mm
2
)
2.72W
[W]
0 25 75 100 125 50
1.0
0.5
0
3.0
2.5
150
[℃]
1-layer board
θja=46.0℃/W
2.0
1.5
Ambient Temperature [Ta]
PCB size:70×70×1.6mm
(Board copper foil area: :70×70mm
2
)
<Reference example>
θj-c:MSOP-8 46.0℃/W
Power Dissipation [Pd]
[W]
0 25 75 100 125 150 50
[℃]
Ambient Temperature [Ta]
0.5
0.25
0
1.0
0.75
(1) 877.2mW
(2) 515.0mW
(3) 242.0mW
(1) 4-layer board（copper foil area : 5505mm
2
）
Every layer has copper foil area,θja=142.5℃/W
(2) 1-layer board
θja=242.7℃/W
(3) With no heat sink
θja=516.5℃/W
(1) 587.4mW
[mW]
0 25 75 100 125 50
200
100
0
600
500
150
[℃]
(1) 1-layer board
θja=212.8℃/W
(2) with no heat sink
θja=322.6℃/W
Power Dissipation [Pd]
400
300
Ambient Temperature [Ta]
(2) 387.4mW
= 0.375(W)
Power consumption(W) = 1.5(V)-0.75(V) ×0.5(A)
1
2
BD3539FVM,BD3539NUX
Technical Note
11/11
www.rohm.com
2009.10 - Rev.
A
© 2009 ROHM Co., Ltd. All rights reserved.
●Ordering part number
B D 3 5 3 9 F V M - T R
Part No. Part No.
3539
Package
FVM: MSOP8
NUX: VSON008X2030
Packaging and forming specification
TR: Embossed tape and reel
Direction of feed
Reel
∗
Order quantity needs to be multiple of the minimum quantity.
<Tape and Reel information>
Embossed carrier tapeTape
Quantity
Direction
of feed
The direction is the 1pin of product is at the upper right when you hold
reel on the left hand and you pull out the tape on the right hand
3000pcs
TR
()
1pin
(Unit : mm)
MSOP8
0.08 S
S
4.0±0.2
8
3
2.8±0.1
1
6
2.9±0.1
0.475
4
57
(MAX 3.25 include BURR)
2
1PIN MARK
0.9MAX
0.75±0.05
0.65
0.08±0.05
0.22
+0.05
−0.04
0.6±0.2
0.29±0.15
0.145
+0.05
−0.03
4°
+
6°
−4°
∗
Order quantity needs to be multiple of the minimum quantity.
<Tape and Reel information>
Embossed carrier tapeTape
Quantity
Direction
of feed
The direction is the 1pin of product is at the upper right when you hold
reel on the left hand and you pull out the tape on the right hand
4000pcs
TR
()
Direction of feed
Reel
1pin
(Unit : mm)
VSON008X2030
5
1
8
4
1.4±0.1
0.25
1.5±0.1
0.5
0.3±0.1
0.25
+0.05
−0.04
C0.25
0.6MAX
(0.12)
0.02
+0.03
−0.02
3.0±0.1
2.0±0.1
1PIN MARK
0.08 S
S
R0039
A
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
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Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specied herein is subject to change for improvement without notice.
The content specied herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specied in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specied herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specied in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, ofce-automation equipment, commu-
nication devices, electronic appliances and amusement devices).
The Products specied in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, re or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, re control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.
The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
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any of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.
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obtain a license or permit under the Law.
P1-P3P4-P6P7-P9P10-P12

BD3539FVM-TR

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