User Guide

ME910G1 HW Design Guide
1VV0301593 Rev.7 Page 31 of 98 2021-02-02
Figure 3: An example of switching regulator with 12V input
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 ME910G1 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 at least 10V.
• A protection diode should be inserted close to the power input, in order to save the
ME910G1 from power polarity inversion. Otherwise the battery connector should
be done in a way to avoid polarity inversions when connecting the battery.
• The battery must be rated to supply peaks of current up to 0.6 A for LTE.
Note: DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly
connected with ME910G1. Their use can lead to overvoltage on the
ME910G1 and damage it. You can use LI-Ion, Li-Po, , Li-FePO4
secondary batteries or hi current Lithium primary batteries.
Thermal Design Guidelines
Worst case as reference values for thermal design of ME910G1 are:
• Average current consumption: 700 mA (LTE CAT M1 and NB1 modes)
• Average current consumption: 700 mA (GPRS and EDGE modes)
• Supply voltage: 4.50V