Microchip Technology PIC18F47Q10 Curiosity Nano Hardware User's Manual page 9

3.3 Power Supply
The kit is powered through the USB port and contains two regulators for generating 3.3V for the debugger
and an adjustable regulator for the target. The voltage from the USB connector can vary between 4.4V to
5.25V (according to the USB specification) and will limit the maximum voltage to the target. The figure
below shows the entire power supply system on PIC18F47Q10 Curiosity Nano.
Figure 3-2. Power Supply Block Diagram
3.3.1 Target Regulator
The target voltage regulator is a MIC5353 variable output LDO. The on-board debugger can adjust the
voltage output that is supplied to the kit target section by manipulating the MIC5353's feedback voltage.
The hardware implementation is limited to an approximate voltage range from 1.7V to 5.1V. Additional
output voltage limits are configured in the debugger firmware to ensure that the output voltage never
exceeds the hardware limits of the PIC18F47Q10 microcontroller. The voltage limits configured in the on-
board debugger on PIC18F47Q10 Curiosity Nano are 1.8-5.1V.
The target voltage is set to 3.3V in production and can be changed through Atmel Studio. Any change to
the target voltage done in Atmel Studio is persistent, even through a power toggle.
The MIC5353 supports a maximum current load of 500 mA. It is an LDO regulator in a small package,
placed on a small PCB, and the thermal shutdown condition can be reached at lower loads than 500 mA.
The maximum current load depends on the input voltage, set output voltage, and the ambient
temperature. The figure below shows the safe operation area for the regulator, with an input voltage of
5.1V and an ambient temperature of 23°C.
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2019 Microchip Technology Inc.
PIC18F47Q10 Curiosity Nano
User Guide
Curiosity Nano
DS40002103A-page 9