LR1110
User Manual Rev.1.0
UM.LR1110.W.APP March 2020
76 of 130
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Figure 9-6: HP PA Output Power vs. TxPower
9.3 PA Current Consumption
9.3.1 Low Power PA
Figure 9-7: IDDTX vs TxPower, Low Power PA, DC-DC Configuration shows the impact of the supply voltage for three
PaDutyCycle settings (0, 4 and 7) in DC-DC configuration.
At a given supply voltage, a higher PaDutyCycle setting increases the device current consumption. At a given PaDutyCycle
setting, the current consumption is optimum for a supply voltage equal or greater to 3.3V, therefore the plots for 3.3 V and
3.7 V are superimposed. A power supply of 1.8V will be not be as power efficient than 3.3V or above, resulting in a higher
current consumption.
For example:
• For 3.7 V, PaDutyCycle=0 the current consumption is approx. 28 mA, for PaDutyCycle=4 approx. 47 mA and for
PaDutyCycle=0 approx. 62mA.
• For PaDutyCycle=4, the current consumption is approx. 47 mA for 3.3 V and 3.7 V, and approx. 49 mA for 1.8 V.
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