ME910C1 mPCIe HW Design Guide
1VV0301642 Rev. 2 Page 16 of 56 2022-01-14
General Design Rules
The principal guidelines for the Power Supply Design embrace three different design
steps:
• The electrical design
• The thermal design
• The PCB layout.
4.3.1. Electrical Design Guidelines
The electrical design of the power supply depends strongly from the power source where
this power is drained.
• +5V input (typically PC internal regulator output)
• +12V input (typically automotive)
+5V Source Power Supply Design Guidelines
• The desired output for the power supply is 3.3V. Since there is not much
difference between the input and the output voltage values, and a linear
regulator can be used.
• When using a linear regulator, a proper heat sink shall be necessary in order to
dissipate the generated heat.
• Since 5V is generally supplied directly from USB, be careful not to have more
than 10uF at input and that USB supplies an appropriate amount of current,
about 1A.
• A Bypass low ESR capacitor of adequate capacity must be provided in order to
cut the current absorption peaks close to the Module, a 100μF capacitor is
usually suitable.
• Make sure the low ESR capacitor on the power supply output rated at least 10V.
An example of linear regulator with 5V input and 3A@3V3 output is shown here below.
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