Nvidia JETSON NANO User Manual page 8

GEO151UB-6025 Power Supply (validated by NVIDIA for use with the Jetson Nano
Developer Kit) is designed to provide 5.25V. The critical point is that the Jetson Nano
module requires a minimum of 4.75V to operate. Use a power supply capable of
delivering 5V at the J28 Micro-USB connector.
Other Power Supply Options
If the developer kit's total load is expected to exceed 2A, e.g., due to peripherals
attached to the carrier board, connect the J48 Power Select Header pins to disable power
supply via Micro-USB and enable 5V⎓4A via the J25 power jack. Another option is to
supply 5V⎓6A via the J41 expansion header (3A per pin).
The J25 power jack is 9.5 mm deep, and accepts positive polarity plugs with 2.1 mm
inner diameter and 5.5 mm outer diameter. As an example, NVIDIA has validated
Adafruit's GEO241DA-0540 Power Supply for use with Jetson Nano Developer Kit.
Power Budget Considerations
The developer kit's total power usage comprised of carrier board, module, and
peripherals, and is determined by your particular use case.
The carrier board consumes between 0.5W (at 2A) and 1.25W (at 4A) with no peripherals
attached.
The Jetson Nano module is designed to optimize power efficiency and supports two
software-defined power modes. The default mode provides a 10W power budget for the
modules, and the other, a 5W budget. These power modes constrain the module to near
their 10W or 5W budgets by capping the GPU and CPU frequencies and the number of
online CPU cores at a pre-qualified level. See the L4T Development Guide for details
about power modes.
Note that the power mode budgets cover the two major power domains for the Jetson
Nano module: GPU (VDD_GPU) and CPU (VDD_CPU). Individual parts of the CORE
(VDD_SOC) power domain, such as video enclode and video decode, are not covered by
these budgets. This is a reason why power modes constrain the module to near a power
budget, but not to the exact power budget. Your particular use case determines the
module's actual power consumption. See the Jetson Nano module Data Sheet for details
about how power domains are used to optimize power consumption.
Attached peripherals are the final component of the developer kit's total power usage.
Select a power supply that is capable of delivering sufficient power for your workload.
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