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LE910Cx HW User Guide
6.3.1.
Electrical Design Guidelines
The electrical design of the power supply strongly depends on the power source where
this power is drained. Power sources can be divided into three categories:
•
+5V input (typically PC internal regulator output)
•
+12V input (typically automotive)
•
Battery
6.3.1.1. + 5V Input Source Power Supply – Design Guidelines
•
The desired output for the power supply is 3.8V. So, the difference between the
input source and the desired output is not great and therefore a linear regulator
can be used. A switching power supply is preferred to reduce power consumption.
•
When using a linear regulator, a proper heat sink must be provided to dissipate
the generated power.
current absorption peaks near the LE910Cx module. A 100 μF tantalum capacitor
•
A bypass low ESR capacitor of adequate capacity must be provided to cut the
is usually suitable on both VBATT and VBATT_PA power lines.
•
Make sure that the low ESR capacitor on the power supply output (usually a
tantalum one) is rated at least 10V.
•
A protection diode must be placed near the power input to protect the LE910Cx
module from power polarity inversion.
Figure 12 shows an example of a linear regulator with 5V input.
Figure 14: Example of Linear Regulator with 5V Input
1VV0301298 Rev. 33
Page 54 of 128
Not Subject to NDA
2021-06-29
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