ME910G1 HW Design Guide
1VV0301593 Rev.7 Page 32 of 98 2021-02-02
: Make PCB design in order to have the best connection of GND
pads to large surfaces of copper.
: The ME910G1 includes a function to prevent overheating.
Power Supply PCB layout Guidelines
As seen on the guidelines for electrical design, the power supply shall have a low ESR
capacitor on the output to cut the current peaks on the input to protect the supply from
spikes. The placement of this component is crucial for the correct working of the circuitry.
A misplaced component can be useless or can even decrease the power supply
performances.
• The Bypass low ESR capacitor must be placed close to the Telit ME910G1 power
input pads or, in the case the power supply is a switching type it can be placed
close to the inductor to cut the ripple provided the PCB trace from the capacitor to
the ME910G1 is wide enough to ensure a voltage dropless connection even during
an 0.6 A (LTE) or 2A (GSM) current peak.
• The protection diode must be placed close to the input connector where the power
source is drained.
• The PCB’s traces from the input connector to the power regulator IC must be wide
enough to ensure no voltage drops occur when an 2 A current peak is absorbed
(valid only for product supporting GSM mode).
• The PCB traces to the ME910G1 and the Bypass capacitor must be wide enough to
ensure no significant voltage drops occur. This is for the same reason as previous
point. Try to keep this trace as short as possible.
• To reduce the EMI due to switching, it is important to keep the mesh involved very
small; therefore the input capacitor, the output diode (if not embodied in the IC)
and the regulator shall form a very small loop.This is done in order to reduce the
radiated field (noise) at the switching frequency (100-500 kHz usually).
• A dedicated ground for the Switching regulator separated by the common ground
plane is suggested.
• The placement of the power supply on the board should be done in such a way to
guarantee that the high current return paths in the ground plane are not
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