3005 USB A-C PD Adapter and PD Dongle EN

Keywords

Raspberry Pi 5, PD Power Supply, PD Negotiation, Remove USB port current limit

I. Introduction

If the Raspberry Pi 5 is to run at full speed with unlocked performance and have the 600mA current limit on the USB ports removed, it must be paired with a power supply that supports the 5V/5A PD protocol. But the Raspberry Pi's power adapter is pricey, and the Raspberry Pi 5's power draw hardly goes beyond 3A in the vast majority of real-world applications.

For example, the Raspberry Pi 5 draws about 1.2A when all four cores are fully loaded. If an SSD is connected via PCIe, the typical power consumption is around 0.5A, while a 5G module connected to a USB 3.0 port consumes approximately 0.8A. With a 5V/3A power supply, there is still a 0.5A margin left for CSI/DSI peripherals and GPIO. In most cases, however, the CPU rarely runs at full load across all four cores continuously.

Based on this, we have designed a USB A-C PD adapter, which is a USB-A to C adapter/decoy with a 5V5A PD protocol. It is used to convert various household devices with 5V output USB-A interfaces (such as power adapters or power modules) into USB-C interfaces that can negotiate 5V5A PD with the Raspberry Pi 5. This ensures the Raspberry Pi 5 OS operates without pop-up warnings and removes the 600mA current limit on the USB ports.

Notes:

1) The actual current output is determined by the USB-A power supply.

2) For the CC cable, it must be a standard CC cable with USB signals and CC signals to perform PD handshake with the Raspberry Pi 5. It cannot be a CC charging-only cable.

II. USB A-C PD adapter

1. Adopt high-strength PCB design with immersion gold process and 2U thickness.

2. Translate the traditional 5V USB-A port into a Type-C port with 5V5A PD protocol, embedded with the 5V5A PD protocol required for Raspberry Pi 5. Compatible with all 5V USB-A devices (power adapters, power modules, etc.) and supports PD handshake with Raspberry Pi 5's USB-C port, ensuring no low-power warning pop-ups on the Raspberry Pi OS and removed 600mA current on USB ports.

3. The USB-C current supports high-current output, capable of delivering up to 5A, and features reversible plug orientation.

4. The actual output depends on the USB-A power adapter/module's own output capability.

Demo: USB-A to Type-C 5V/5A PD Trigger Adapter for Raspberry Pi 5

Application Scenario:

1) 5V power adapter (ensure 5V, regardless of current rating), with a USB-A output port, connected to a Raspberry Pi 5 via a USB A-to-C PD adapter.

2) 5V5A power module, USB-A output port equipped with a USB A-to-C PD adapter to connect to a Raspberry Pi 5.

3) 5V5A single PD power module, with USB-A output port equipped with a USB A-to-C PD adapter connected to a Raspberry Pi 5.

4) The RPi5_5V5A dual PD power module, equipped with a USB A-C PD adapter, allows one module to simultaneously power two Raspberry Pi 5 boards, sharing the 5V5A output. Both Raspberry Pi 5 OSs will operate without triggering low-power warnings, and the USB ports will not have current restrictions.

5) 21700 5V5A PD power module, USB-A output port equipped with a USB A-C PD adapter for Raspberry Pi 5.

6) 21700 5V4A power module, with a USB A-to-C PD adapter for USB-A output port, connected to a Raspberry Pi 5, providing 3A power supply, and can even reach 4A.

7) 18650 5V 3A power module, USB-A output port equipped with a USB A-to-C PD adapter to power a Raspberry Pi 5, supplying 3A.

8) Power the Raspberry Pi 5 with a 5V3A SuperCap using a USB A-C PD adapter, ensuring no OS warning pop-ups and unlimited current on the USB ports.

III. PD Dongle

The PD dongle is an adapter designed for 5V5A PD handshake with the Raspberry Pi 5. It ensures that the Raspberry Pi 5 OS does not display power warnings, removes the 600mA current limit on USB ports, and supports reversible plugging with the USB-C port. The adapter is compact in size, measuring only 1*1cm, saving space. It features immersion gold process and lead-free production.

Application Scenario:

If the Raspberry Pi 5 is powered via pogo pins or PoE, it cannot establish a PD handshake through the USB-C power port. the OS will display a warning pop-up (as shown in the red box in the image below) after boot.

Moreover, the USB ports on the Raspberry Pi 5 are current-limited to 600mA. In this case, you can plug our PD dongle adapter into the Raspberry Pi 5's USB-C power port to achieve a 5V/5A PD handshake.The Raspberry Pi 5 will support full-speed, maximum-performance operation, while its USB current limit will also be increased from 600mA to 1.6A.

Note:

The PD dongle is only used for PD negotiation handshake with the Raspberry Pi 5 and does not participate in power supply itself. The actual power supply capability is determined by the pogo pins or the PoE module.

Usage demonstration:

1）The MPS2242-POE expansion board supplies power to the Raspberry Pi 5 through POE, working in conjunction with the PD Dongle adapter.

2）The MPS2280-POE expansion board supplies power to the Raspberry Pi 5 through POE (Power over Ethernet), working in conjunction with the PD Dongle adapter.

3）MP2.5G-POE expansion board supplies power to the Raspberry Pi 5 through POE (Power over Ethernet), working in conjunction with the PD Dongle adapter.

4）221700 5V5A PD power module with pogo pins for Raspberry Pi 5, compatible with a PD dongle adapter.

5）21700 5V3A power module, supply current 3A. Powers the Raspberry Pi 5 via pogo pins, and with the PD Dongle adapter, the maximum current can reach 4A.

6）18650 5V3A power module with pogo pins for Raspberry Pi 5, max current 3A, compatible with PD Dongl

Contact Us

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Email: mcuzone@vip.qq.com

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