AN1902 Freescale Semiconductor / Motorola, AN1902 Datasheet - Page 29

• Manufacturer Part Number: AN1902
• Description: Quad Flat Pack No-Lead (QFN)
• Manufacturer: Freescale Semiconductor / Motorola

MOTOROLA
Additional self-inductance results from 32ld 0.65mm pitch 7x7mm and 44ld 0.65mm
pitch 9x9mm packages are provided in
sizes was plotted for each package size. Note that the results between 32ld 7x7mm
and 44ld 9x9mm QFN packages were very similar.
Figure 31
TQFP and QFN packages (lead pitch of both packages is 0.50 mm). Averages values
are 3.02 x 10
In
du
ct
an
ce
,
nH
Freescale Semiconductor, Inc.
3.00
2.50
2.00
1.50
1.00
0.50
0.00
For More Information On This Product,
Figure 30 32ld 7x7mm and 44ld 9x9mm QFN Self-Inductance Chart
0
32ld 0.65mm Pitch 7x7 mm QFN
Figure 29 Electrical Modeling of 7x7 mm 48ld QFN vs 48ld TQFP
Self Inductance: Leads + Bonding Wire
compares the simulated values of self-capacitance for 7x7mm 48-lead
Ca
pa
cit
an
ce
Quad Flat Pack No-Lead (QFN)
0.000E+00
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0.00
-2
2.500E-13
2.000E-13
1.500E-13
1.000E-13
5.000E-14
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and 1.20 x 10
10
1
Lead Number
1
4
Figure 31 48ld TQFP vs. QFN Package
4
7
Self Inductance: Leads + Bonding Wire
Die Size = 3.43 mm x 3.43 mm
Die Size = 2.16 mm x 2.16 mm
Die Size = 4.50 mm x 4.50 mm
20
7
10 13 16 19 22 25 28 31 34 37 40 43 46
10
-1
pF for the QFN and TQFP packages, respectively.
13
Self Capacitance
16
30
Lead Number
19
Figure
Lead Number
22
25
In
du
ct
an
ce
,
nH
28
30. Self-inductance of different die
3.00
2.50
2.00
1.50
1.00
0.50
0.00
31
0
44ld 0.65mm Pitch 9x9 mm QFN
34
Self Inductance: Leads + Bonding Wire
37
10
40
43
Lead Number
20
46
Die Size = 5.43 mm x 5.43 mm
Die Size = 6.30 mm x 6.30 mm
Die Size = 4.16 mm x 4.16 mm
TQFP
QFN
30
QFN
TQFP
AN1902/D
40
29