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L99VR02XP 数据表(PDF) 7 Page - STMicroelectronics

部件名 L99VR02XP
功能描述  Dual automotive linear voltage regulator with configurable output voltage (2x250 mA current capability)
PDF  50 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L99VR02XP 数据表(HTML) 7 Page - STMicroelectronics

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2.2
Thermal data
2.2.1
Thermal resistance
Table 3. Operation junction temperature
Item
Symbol
Parameter
Value(1)
Unit
A.001
Rthj-case
Junction to case thermal resistance
4.6
°C/W
A.002
Rthj-amb_auto
Junction to ambient thermal resistance single LDO
23.5
°C/W
A.066
Rthj-amb_mutual
Junction to ambient thermal resistance when EN1 is high and EN2 low
18
°C/W
1. Measured on VS.
The values quoted are for PCB 129 mm x 60 mm x 1.6 mm, FR4, four layers; Cu thickness 0.070 mm (outer
layers). Cu thickness 0.035 mm (inner layers), thermal via separation 1.2 mm, thermal via diameter 0.3 mm ±0.08
mm, Cu thickness on via 0.025 mm. Footprint dimension 4.1 mm x 6.5 mm.
To calculate the TJ of the device, the following cases are then taken into account:
Table 4. TJ calculation
LDO1
LDO2
ΔTJLDO1
ΔTJLDO2
ON
OFF
PdLDO1 * RthA
PdLDO1 * RthAB
OFF
ON
PdLDO2 * RthAB
PdLDO2 * RthB
ON
ON
PdLDO1 * RthA + PdLDO2 * RthAB
PdLDO2 * RthB + PdLDO1 * RthAB
Figure 3. Rth_amb junction to ambient thermal resistance
Chip1
Rth A
Chip2
Rth B
Rth AB
In the case of only LDO1 is switched on, the TJ will be:
TJ = Tamb + (PdLDO1 * RthA) + (PdLDO1 * RthAB)
In case both LDO1 and LDO2 are switched on, TJ will be:
TJ = Tamb + (PdLDO1 * RthA+ PdLDO2 * RthAB) + ( PdLDO2 * RthB + PdLDO1 * RthAB)
Where:
•
Pd is power dissipation of the device
•
RthA and RthB are Rthj-amb_auto
•
RthAB is Rthj-amb_mutual
L99VR02XP
Electrical specifications
DS14686 - Rev 1
page 7/50



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