User Guide

ME910G1 HW Design Guide
1VV0301593 Rev.7 Page 29 of 98 2021-02-02
General Design Rules
The main guidelines for the Power Supply Design include three different design steps:
• the electrical design of the power supply
• the thermal design
• the PCB layout
Electrical Design Guidelines of the power supply
The electrical design of the power supply strongly depends on the power source where
this power is drained. We will distinguish them into three categories:
• +5V input (typically PC internal regulator output)
• +12V input (typically automotive)
• Battery
+5V Source Power Supply Design Guidelines
• The desired output for the power supply is 3.8V, so there's not a big difference
between the input source and the desired output and a linear regulator can be
used. A switching power supply will not be suited due to the low drop out
requirements.
• When using a linear regulator, a proper heat sink shall be provided in order to
dissipate the power generated.
• 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.