ML865G1 HW Design Guide
1VV0301632 Rev. 4 Page 28 of 86 2020-09-23
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. We will distinguish them into three categories:
• +5V input (typically PC internal regulator output)
• +12V input (typically automotive)
• Battery
4.3.1.1. +5V Source Power Supply Design Guidelines
• The desired output for the power supply is 3.8V, hence 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 because of 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
suited.
• Make sure the low ESR capacitor on the power supply output rated at least 10V.
An example of linear regulator with 5V input is:
delines
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