User Guide
Table Of Contents
- APPLICABILITY TABLE
- CONTENTS
- 1. Introduction
- 2. General Product Description
- 3. PINS ALLOCATION
- 4. Power Supply
- 5. DIGITAl SECTION
- 6. RF SECTION
- 7. AUDIO SECTION
- 8. GNSS Section
- 9. Mechanical Design
- 10. APPLICATION PCB Design
- 11. PACKAGING
- 12. Conformity Assessment Issues
- 13. PRODUCT AND SAFETY INFORMATION
- 14. GLOSSARY
- 15. Document History
ME910G1 Hardware Design Guide
1VV0301593 Rev.15 Page
31 of 100 2022-08-23
Not Subject to NDA
Figure 2: An example of linear regulator with 5V input
4.3.1.2. +12V Source Power Supply Design Guidelines
• The desired output for the power supply is 3.8V, so due to the large difference
between the input source and the desired output, a linear regulator is not suitable
and shall not be used. A switching power supply will be preferable because of its
better efficiency.
• A regulator must be provided to absorb current peaks. The recommended
switching regulator is 500kHz or more. Due to its smaller inductor size and faster
transient response, it has a higher switching frequency.
• The frequency and selection of Switching design are related to the application,
since the switching frequency could also generate EMC interferences.
• For a PB car battery the input voltage may rise up to 15,8V and this must be
considered when selecting components: all components in the power supply must
support this voltage.
• A low ESR Bypass capacitor must be included to stop the current absorption peaks
near the Module. The recommended capacitor is 100μF.
• Make sure the low ESR capacitor on the output of the power supply is rated at least
10V.
• For Car applications, a spike protection diode should be placed close to the power
input, to clean the supply from the spikes.