Datasheet

SX1302
Datasheet Rev 1.0
DS.SX1302.W.APP June 2019
18 of 31
www.semtech.com
5. Power Distribution
The SX1302 needs two powers rails: VCC_IO and VCC_CORE. VCC_IO sets the voltage level for all of the digital interfaces of
the chip (SPI, GPIO and IQ interface), whilst VCC_CORE supplies current to the baseband engine. VCC_CORE can be derived
from a higher voltage source with a high-efficiency DC-DC buck converter, as it is only 1.2 V. An optimized power
management strategy is proposed in Semtech’s reference designs, and one example of displayed in Section 10.2
"Reference Block Diagram" on page 24 .
The following currents can be measured, and should be used to design the power supply in the system:
During a reception phase, the current observed won’t be always the same, but will spike up during certain phases of the
reception. Therefore, the average current should be used to compute the total energy consumption of the SX1302 based
gateway, however the peak current will be the relevant metric to size the power supply components.
Table 5-1: Current Consumption
Conditions VCC_CORE
Temperature @ 1.2 V
Average current 25°C 17 mA
Peak current 25°C 28 mA
Average current 60°C 48 mA
Peak current 60°C 55 mA
Average current 85°C 77 mA
Peak current 85°C 85 mA