Microchip Technology PIC18F47K42 Curiosity Nano Hardware User's Manual page 10

Figure 3-2. Power Supply Block Diagram
VUSB
USB
Power consumer
Power converter
Power protection
Power source
Cut strap
3.3.1 Target Regulator
The target voltage regulator is a MIC5353 variable output LDO. The on-board debugger can adjust the voltage output
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 PIC18F47K42
microcontroller. The voltage limits configured in the on-board debugger on PIC18F47K42 Curiosity Nano are
2.3-5.1V.
Info: The target voltage is set to 3.3V in production. It can be changed through MPLAB X IDE project
properties. Any change to the target voltage 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 printed circuit board (PCB), and the thermal shutdown condition can be reached at lower loads than 500 mA.
The maximum current load depends on the input voltage, the selected output voltage, and the ambient temperature.
The figure below shows the safe operating area for the regulator, with an input voltage of 5.1V and an ambient
temperature of 23°C.
©
2019 Microchip Technology Inc.
Target
Regulator
On/Off
Adjust
DEBUGGER
Regulator
PTC
Fuse
VBUS
PIC18F47K42 Curiosity Nano
VREG
VLVL
Measure
On/Off
I/O
P3V3
DEBUGGER
shifter
#VOFF ID system
User Guide
Curiosity Nano
VTG
Power Target
Power
Supply
strap strap
I/O
I/O
Level GPIO
straps
DS50002899B-page 10
Target
MCU