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LM1117-2.85-220 Scheda tecnica(PDF) 10 Page - First Components International

Il numero della parte LM1117-2.85-220
Spiegazioni elettronici  800mA Low-dropout Linear Regulator Temperature Range Output Current 800mA
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Produttore elettronici  FCI [First Components International]
Homepage  http://www.cotra.com.tw/
Logo FCI - First Components International

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APPLICATION NOTE (Continued)
The next parameter which must be calculated is the maxi-
mum allowable temperature rise, T
R(max):
T
R(max)=TJ(max)-TA(max)
where T
J(max) is the maximum allowable junction tempera-
ture (125˚C), and T
A(max) is the maximum ambient tem-
perature which will be encountered in the application.
Using the calculated values for T
R(max) and PD, the maxi-
mum allowable value for the junction-to-ambient thermal re-
sistance (
θ
JA) can be calculated:
θ
JA =TR(max)/PD
If the maximum allowable value for
θ
JA
is found to be
≥136˚C/W for SOT-223 package or ≥79˚C/W for TO-220
package or
≥92˚C/W for TO-252 package, no heatsink is
needed since the package alone will dissipate enough heat
to satisfy these requirements. If the calculated value for
θ
JA
falls below these limits, a heatsink is required.
As a design aid,
Table 1 shows the value of the
θ
JA of SOT-
223 and TO-252 for different heatsink area. The copper pat-
terns that we used to measure these
θ
JAs are shown at the
end of the Application Notes Section.
Figure 7 and Figure 8
reflects the same test results as what are in the
Table 1
Figure 9 and Figure 10 shows the maximum allowable power
dissipation vs. ambient temperature for the SOT-223 and
TO-252 device. Figures
Figure 11 and Figure 12 shows the
maximum allowable power dissipation vs. copper area (in
2)
for the SOT-223 and TO-252 devices. Please see AN1028
for power enhancement techniques to be used with SOT-223
and TO-252 packages.
TABLE 1.
θJA Different Heatsink Area
Layout
Copper Area
Thermal Resistance
Top Side (in
2)*
Bottom Side (in
2)(
θ
JA,˚C/W) SOT-223
(
θ
JA,˚C/W) TO-252
1
0.0123
0
136
103
2
0.066
0
123
87
3
0.3
0
84
60
4
0.53
0
75
54
5
0.76
0
69
52
61
0
66
47
7
0
0.2
115
84
8
0
0.4
98
70
9
0
0.6
89
63
10
0
0.8
82
57
11
0
1
79
57
12
0.066
0.066
125
89
13
0.175
0.175
93
72
14
0.284
0.284
83
61
15
0.392
0.392
75
55
16
0.5
0.5
70
53
*Tab of device attached to topside copper
FIGURE 7.
θJA vs. 1oz Copper Area for SOT-223
FIGURE 8.
θJA vs. 2oz Copper Area for TO-252
10
LM1117 800mA Low-dropout Linear Regulator


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