Looking for a simple USB-C PD sink chip (9V/12V, resistor/GPIO control) - Page 1
Forum section: electronics / projects

author: conducteur
author_rank: Regular Contributor
timestamp: February 25, 2025, 02:00:28 pm
content: Hi everyone,I've been searching all afternoon, but most of what I’ve found are complex ICs that honestly scare me 😅. I'm just looking for a simple USB-C PD sink chip that can request 9V or 12V with as few components as possible—ideally without needing an MCU.I’d love something where the voltage selection can be done using resistors or GPIO, rather than firmware or I²C commands.What I’ve found so far:HUSB238 (Adafruit) – Seems perfect, supports resistor-based voltage selection, but hard to find as a standalone chip.IP2721 (Injoinic) – Works, but I'd prefer to avoid obscure Chinese chips if possible.I'm looking for an alternative from a well-known, easy-to-source manufacturer (e.g., STMicro, Texas Instruments, Microchip, or Analog Devices). The ideal chip should be:✅ Standalone (no firmware required)✅ Able to request 9V or 12V✅ Voltage selection via resistors or GPIO✅ Readily available from Farnell, Mouser, or Digi-KeyI’m hoping there’s a simple solution out there—any suggestions?Thanks! 🙏

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: February 25, 2025, 02:21:42 pm
content: HUSB238 is readily available from LCSCDiodes Inc do this one :https://www.diodes.com/part/view/AP33771C

author: DavidAlfa
author_rank: Super Contributor
timestamp: February 25, 2025, 02:25:41 pm
content: CH224K supports digital inputs or resistors.The CH221K is smaller but only supports resistor mode.Datasheethttps://www.aliexpress.com/item/1005007038297700.htmlLcsc has plenty of PD.chips:https://www.lcsc.com/products/USB-PD_13518.html

author: eleguy
author_rank: Regular Contributor
timestamp: February 25, 2025, 02:31:35 pm
content: Diodes AP33771 has been good (supporting PD3.0) but seems to be now in "NRND" (Not Recommended for New Design). But why not AP33771C (PD3.1) as mentioned above. That I just have not tried yet.

author: conducteur
author_rank: Regular Contributor
timestamp: February 25, 2025, 03:27:30 pm
content: Thanks!AP33771C is what i'm looking for...

author: voltsandjolts
author_rank: Unknown
timestamp: February 25, 2025, 04:03:23 pm
content: The EVB looks useful for quick setup and test, but £100 is a rip off.https://www.digikey.co.uk/en/products/detail/diodes-incorporated/AP33771C-EVB/24716702

author: Niklas
author_rank: Frequent Contributor
timestamp: February 26, 2025, 06:21:45 am
content: TPS26730 from TI might be an option.It also has a sibling, TPS25750/TPS25751, that can be used as a sink or source with either a microcontroller or config EEPROM.

author: SiliconWizard
author_rank: Super Contributor
timestamp: February 26, 2025, 06:32:05 am
content: I've used the CH224K which works as documented and will do what you want here. It doesn't seem to be available at Mouser or Digikey though (but it is at LCSC and JLCPCB, and it's cheap).

author: mayor
author_rank: Regular Contributor
timestamp: March 15, 2025, 09:43:19 am
content: Quote from: conducteur on February 25, 2025, 03:27:30 pmI Used this in a recent design, works well. I still have to understand why a specific Apple power brick won't negotiate with it, but others tested all do, so it hasn't been a priority.