LN920 HW Design Guide
1VV0301730 Rev. 1
Page 31 of 81
2021-08-11
Not Subject to NDA
•
When using a linear regulator, a proper heat sink shall be provided in order to
dissipate the power generated.
•
A Bypass low ESR capacitor of adequate capacity must be provided in order to cut
the current absorption peaks close to the Module, a 100
μ
F capacitor is usually
suitable.
•
Make sure the low ESR capacitor on the power supply output rated at least 10V.
•
A protection diode must be inserted close to the power input to protect the LN920
module from power polarity inversion.
4.3.2.
Thermal Design Guidelines
The aim of this chapter is to provide thermal design guidelines useful for developing a
product with the LN920.
Proper thermal protection design protects against human or component damage for
worst-case conditions.
Furthermore, it reduces the failure probability and does not adversely affect normal
module operation and greatly extends the operation time with maximum performance.
For more details, please refer to the dedicated thermal design guideline document.
Note: The average consumption during transmission depends on the
power level at which device is requested to transmit via the network.
Therefore, the average current consumption varies significantly.
Note: There is the large solder resist opening area on the bottom side
of the module. Adding a TIM on that area with a heatsink is one of the
recommended way to dissipate heat.
Modem temperature can be read by means of AT commands.
