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SI5935DC-T1-E3 Datasheet(PDF) 8 Page - Vishay Siliconix

Part # SI5935DC-T1-E3
Description  Dual P-Channel 1.8 V (G-S) MOSFET
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Manufacturer  VISHAY [Vishay Siliconix]
Direct Link  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SI5935DC-T1-E3 Datasheet(HTML) 8 Page - Vishay Siliconix

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AN812
Vishay Siliconix
www.vishay.com
2
Document Number: 71127
12-Dec-03
Front of Board
Back of Board
FIGURE 3.
vishay.com
ChipFETr
THERMAL PERFORMANCE
Junction-to-Foot Thermal Resistance (the Package
Performance)
Thermal performance for the 1206-8 ChipFET measured as
junction-to-foot thermal resistance is 30_C/W typical, 40_C/W
maximum for the dual device. The “foot” is the drain lead of the
device as it connects with the body. This is identical to the dual
SO-8 package RQjf performance, a feat made possible by
shortening the leads to the point where they become only a
small part of the total footprint area.
Junction-to-Ambient Thermal Resistance
(dependent on pcb size)
The typical RQja for the dual-channel 1206-8 ChipFET is
90_C/W steady state, identical to the SO-8. Maximum ratings
are 110_C/W for both the 1206-8 and the SO-8. Both packages
have comparable thermal performance on the 1” square pcb
footprint with the 1206-8 dual package having a quarter of the
body area, a significant factor when considering board area.
Testing
To aid comparison further, Figure 4 illustrates ChipFET 1206-8
dual thermal performance on two different board sizes and
three different pad patterns.The results display the thermal
performance out to steady state and produce a graphic
account on how an increased copper pad area for the drain
connections can enhance thermal performance. The
measured steady state values of RQja for the Dual 1206-8
ChipFET are :
1) Minimum recommended pad pattern (see
Figure 2) on the evaluation board size of
0.5 in x 0.6 in.
185_C/W
2) The evaluation board with the pad pattern
described on Figure 3.
128_C/W
3) Industry standard 1” square pcb with
maximum copper both sides.
90_C/W
The results show that a major reduction can be made in the
thermal resistance by increasing the copper drain area. In this
example, a 57_C/W reduction was achieved without having to
increase the size of the board. If increasing board size is an
option, a further 38_C/W reduction was obtained by
maximizing the copper from the drain on the larger 1” square
PCB.
Time (Secs)
FIGURE 4.
Dual 1206-8 ChipFET
0
1
200
40
80
100
1000
120
10
10-1
10-2
10-3
10-4
10-5
1” Square PCB
Dual EVB
Min. Footprint
160
SUMMARY
The thermal results for the dual-channel 1206-8 ChipFET
package display identical power dissipation performance to
the SO-8 with a footprint reduction of 80%. Careful design of
the package has allowed for this performance to be achieved.
The short leads allow the die size to be maximized and thermal
resistance to be reduced within the confines of the TSOP-6
body size.
ASSOCIATED DOCUMENT
1206-8 ChipFET Single Thermal performance, AN811,
(http://www.vishay.com/doc?71126).


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