When building a USB PD sink/power-request design, decoy chips are usually selected by voltage capability, protocol support, and cost.
Chip Comparison
| Chip | Key Features | Best For |
|---|---|---|
| CH224K (WCH) | Popular and cost-effective, resistor-configurable, up to 20V output | High-power PD requests and general-purpose designs |
| HUSB238 (Hynetek) | Small size, high integration, compliant with USB PD3.0, supports PPS and PD3.1 28V | Compact devices that need higher voltage output |
| HUSB237 (Hynetek) | Minimal PD Sink design, supports PD3.1 (5V/9V/12V/15V/20V), up to 20V/5A (100W), supports SOP’ (eMarker emulation), BC1.2 and QC2.0 | Cost-effective sink designs that need very simple external circuitry, especially 100W cable-related use cases |
| IP2721 (Injoinic) | Auto plug-in/out detection, compatible with PD2.0/3.0, stable behavior | Products needing automatic detection and stronger protocol handling |
| XSP series (for example XSP01/XSP05) | Cost-effective, broad support for PD + QC + FCP + SCP + AFC | Multi-protocol fast-charging products such as phone adapters and wireless charging modules |
Selection Tips
- For mature and budget-friendly designs: start with CH224K or XSP series.
- For compact boards and higher voltage demand: consider HUSB238 first.
- For minimal BOM and up to 100W (20V/5A): consider HUSB237 first.
- For stronger protocol handling and auto detection: consider IP2721 first.