GE/GC864-QUAD V2 and GE864-GPS Hardware User Guide
1vv0300915 Rev.5 – 2011-10-03
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved.
Page 40 of 94
As far as car PB battery, the input voltage can rise up to 15.8V. This must 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 100
μ
F tantalum capacitor is typically used.
Make sure the low ESR capacitor on the power supply output (usually a tantalum
one) is rated at least 10V.
As far as car applications, a spike protection diode must be inserted close to the
power input, in order to clean the supply from spikes.
A protection diode can be inserted close to the power input, in order to save the
module from power polarity inversion. This can be the same diode used for spike
protection.
An example of switching regulator with 12V input is in the schematic below (split in 2 parts):
