User Guide

ME310G1 Hardware Design Guide
1VV0301588 Rev. 11 Page 30 of 91 2021-03-16
• In any case the frequency and Switching design selection is related to the
application to be developed since the switching frequency could also generate
EMC interferences.
• For car PB battery the input voltage can rise up to 15,8V and this should be kept in
mind when choosing components: all components in the power supply must
withstand this voltage.
• A Bypass low ESR capacitor of adequate capacity must be provided in order to cut
the current absorption peaks, a 100μF capacitor is usually suitable.
• Make sure the low ESR capacitor on the power supply output has a nominal voltage
of at least 10V.
• For Car applications a spike protection diode should be inserted close to the power
input, in order to clean the power supply from the spikes.
An example of switching regulator with 12V input is in the below schematic:
Figure 3: Recommended Circuit
4.3.1.3. Battery Source Power Supply Design Guidelines
The desired nominal output for the power supply is 3.8V and the maximum voltage
allowed is 4.2V, hence a single 3.7V Li-Ion cell battery type is suited for supplying the
power to the Telit ME310G1 module.
• A Bypass low ESR capacitor of adequate capacity must be provided in order to cut
the current absorption peaks, a 100μF tantalum capacitor is usually suited.
• Make sure the low ESR capacitor (usually a tantalum one) is rated of at least 10V.