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PocketPD is a compact, USB Type-C powered desktop power supply designed to be easily carried in one hand or even tucked into a pocket for convenient portability. Despite its small size, it is packed with powerful features that allow it to deliver a wide voltage range while maintaining a high level of safety. In addition to its core functionality, PocketPD comes equipped with an OLED display, a current sensor, and a banana plug output, making it compatible with standard devices such as modern USB-C chargers and power banks. It also includes an extra feature: the ability to act as a Power Delivery 3.0 profile tester.
Built on the Programmable Power Supply (PPS) mode of USB Power Delivery 3.0 and later versions, PocketPD enables users to directly obtain precise voltage and current from their charger. This makes it ideal for applications where accurate power delivery is essential.
The designer aimed to create an open-source solution that is user-friendly, versatile, and easy to carry. With physical buttons and a clear OLED display, PocketPD allows users to start using it immediately by simply plugging in a compatible charger or power bank—no complicated setup required. Its combination of multifunctionality, ease of use, and compact design makes it an excellent choice for both professionals and beginners looking to expand their power tools.
The core of PocketPD is based on the PPS mode introduced in 2015. Therefore, it's important to confirm that your charger or power bank supports this mode. Originally developed to improve smartphone battery charging, PPS allows devices to set exact voltage and current levels, which makes it well-suited for desktop power supply applications. Many modern chargers and power banks, including popular brands like Anker, Ugreen, Baseus, and CUKTECH, now support PPS. If you're unsure about compatibility, check your device's documentation for confirmation.
It's important to note that the maximum voltage and current output of PocketPD depends on the USB Type-C charger and cable used. The output will be limited by the lowest current rating of the charger and cable. For example, if your charger supports 5A but you're using a 3A cable, the maximum current output will be 3A. Similarly, the voltage range of the charger determines the available output range of PocketPD. Common ranges include 3.3V to 11V and 3.3V to 21V.
Key Features & Specifications:
- Input: USB Type-C, PD 3.0 compliant
- Output: 0–20 V @ 0–5 A (adjustable)
- Modes: Constant Voltage (CV), Constant Current (CC)
- Display: 0.96-inch OLED display
- Microcontroller: Raspberry Pi RP2040 Cortex M0+
- Protocol IC: AP33772 USB PD sink controller
- Safety Features: Short circuit, reverse current, fly-back diode protection
- Dimensions: 87 x 62 x 25.5 mm (3.43 x 2.44 x 1 in)
- Weight: 81 g (2.87 oz)
This exciting project is currently being crowdfunded on CrowdSupply. If you're interested in supporting it, visit the PocketPD page for more details. Your support can help bring this innovative and versatile tool to life.