User Guide

LE910Cx HW User Guide
1VV0301298 Rev. 34 Page 58 of 131
Not Subject to NDA
• Average GPS current consumption during GPS tracking (LTE @ idle): mA (40mA).
Note:
The average consumption during transmission depends on the
power level at which the device is requested to
transmit via the
network. Therefore, the average current consumption varies
significantly.
Note: The thermal design for the power supply must be made
keeping an average consumption at the max transmitting level during
calls of (LTE/HSPA)/GPRS plus average consumption
in GPS
Tracking mode.
Considering the very low current during Idle, especially if the Power Saving function is
enabled, it is possible to consider from the thermal point of view that the device absorbs
significant current only during an Active Call or Data session.
For the heat generated by the LE910Cx module, consider it to be 2W max during
transmission at Class10 GPRS upload.
In LTE/WCDMA/HSPA mode, the LE910Cx emits RF signals continuously during
transmission. Therefore, special attention must be paid to how to dissipate the heat
generated.
The LE910Cx is designed to conduct heat flow from the module IC’s towards the bottom
of the PCB across GND metal layers
The generated heat is mainly conducted to the ground plane under the LE910Cx module.
The application board should be properly designed to dissipate this heat.
Application board design must ensure that the area under the LE910Cx module is as large
as possible. Make sure that the LE910Cx is mounted to the large ground area of the
application board and provide plenty of ground vias to dissipate heat.
Although the peak current consumption in GSM mode is higher than in
LTE/WCDMA/HSPA, considerations for the heat sink are more important in the case of
WCDMA due to the continuous transmission conditions.