User's Manual

LE910 V2 HARDWARE USER GUIDE 1VV0301200 Rev.2 Preliminary • 2015-08-04 25 of 81
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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 LE910 V2 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 LE910 V2 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 0.8 A for LTE and WCDMA mode and 2A for
GSM mode.
NOTE:
DON'T USE any Ni-Cd, Ni-MH, and Pb battery types directly connected with LE910 V2.
Their use can lead to overvoltage on the LE910 V2 and damage it. USE ONLY Li-Ion
battery types.