LE910C1 Hardware User Guide
1VV0301298 Rev. 1.08 - 2017-11-14
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6.2.2. Thermal Design Guidelines
The thermal design for the power supply heat sink must be done with the following specifications:
• Average current consumption during RF transmission @PWR level max in LE910C1 as
shown in Table 17
• Average current consumption during Class12 GPRS transmission @PWR level max as shown
in Table 17
• 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 LE910C1 module, consider it to be 2W max during transmission at
Class12 GPRS upload. The generated heat is mostly conducted to the ground plane under the
LE910C1 module. Ensure that your application can dissipate heat.
In LTE/WCDMA/HSPA mode, the LE910C1 emits RF signals continuously during transmission.
Therefore, you must pay special attention how to dissipate the heat generated.
Application board design needs to make sure the area under the LE910C1 module is as large as
possible. Make sure that the LE910C1 is mounted on the large ground area of application board
and provide many ground vias to dissipate the heat.
Even though 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.
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