UBX-G7020 - Hardware Integration Manual
Design-in
GPS.G7-HW-10003
Objective Specification
Page 12 of 74
2.1.2
Supply voltages
2.1.2.1
V_Core: Main supply voltage
V_CORE is the main supply which supplies the LDO_RF and LDO_C regulators to provide voltages for the core
domain and the RF domain.
The current at V_CORE depends heavily on the current system state and in general exhibits very dynamic
behaviour.
Do not add any series resistance (< 0.2 Ohm) into V_CORE supply as it will generate input voltage noise
owing to the dynamic current conditions.
2.1.2.1.1
DC/DC converter
To improve the power consumption, the supply for V_CORE can be generated with the optional built in DCDC
converter. It generates an output voltage of ~1.45V.
Figure 3: UBX-G7020’ PMU using DCDC converter
The DC/DC block provides an energy conversion efficiency of about 85%, the actual value depending on current
drawn and external inductor L2 and capacitor C6 used. Thus the power savings at a 3.3V power supply can be
almost 50%, see Figure 4.
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