NOTE:
The reported LTE CAT M1 and LTE CAT NB1 values are an average
among all the product variants and bands for each network wireless
technology.
The support of specific network wireless technology depends on
product variant configuration.
General Design Rules
The principal guidelines for the Power Supply Design embrace three different design
steps:
• the electrical design of the power supply
• the thermal design
• the PCB layout
4.3.1. Electrical Design Guidelines of the power supply
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.
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