User's Guide

LE866 HARDWARE USER GUIDE 1vv0301210 Rev.0 Preliminary 2015-09-02 22 of 68
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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 LE866 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 LE866 from
power polarity inversion. Otherwise the battery connector should be done in a way to avoid
polarity inversions when connecting the battery.
The battery capacity must be at least 500mAh in order to withstand the current peaks of 2A;
the suggested capacity is from 500mAh to 1000mAh.