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L99VR033PTR Datasheet(PDF) 17 Page - STMicroelectronics

Part # L99VR033PTR
Description  Automotive low dropout linear voltage regulator having 300 mA of current capability
PDF  28 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L99VR033PTR Datasheet(HTML) 17 Page - STMicroelectronics

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Figure 24. Rthj-amb vs PCB copper area in still air condition - PWSSO12
40.0
45.0
50.0
55.0
60.0
65.0
70.0
75.0
80.0
85.0
0
2
4
6
8
10
RTHj_amb
Rthj_amb(°C/W)
PCB (2 layers 2 oz) Cu heatsink area (cm^2)
Footprint
Figure 25. Thermal impedance curves junction to ambient - PWSSO12
1
10
100
0.01
0.10
1.00
10.00
100.00
1000.00
ZTH (°C/W)
Time (s)
Cu = footprint
Cu = 2 cm2
Cu = 8 cm2
4 Layers
Pulse calculation formula:
ZTHδ=RTH.δ+ZTHtp1−δ
(1)
Where:
δ=tp/T
L99VR03
Package andPCB thermal data
DS14803 - Rev 2
page 17/28



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