Semtech LR1110 - Figure 9-8: IDDTX Vs Txpower, Low Power PA, LDO Configuration

LR1110
User Manual Rev.1.0
UM.LR1110.W.APP March 2020
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Semtech
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Figure 9-7: IDDTX vs TxPower, Low Power PA, DC-DC Configuration
Figure 9-8: IDDTX vs TxPower, Low Power PA, LDO Configuration show the impact of the supply voltage for three
PaDutyCycle settings (0, 4 and 7) in LDO configuration.
Similarly to the DC-DC configuration, we can notice that at a given supply voltage, a higher PaDutyCycle setting increases
the device current consumption. However, the supply voltage has no influence on the current consumption at a given
PaDutyCycle setting, which means that the plots for 1.8 V, 3.3 V, and 3.7 V are superimposed.
Figure 9-7 and Figure 9-8 show that the power efficiency of the Low Power PA is maximized when the internal DC-DC
regulator is used at or above 3.3V.