Just buy the right one, for example Google TC 1000 or Asus AQ18A-59A (both are 18W up to 9V/2A or rather both indeed support 5V/3A). @Photon and @veleno (as add-on to the related USB-DCP thread), if you prefer having built-in high-voltage filter electrolytic capacitors (two are 400V 22μF and the other two are 400V 33μF) take AUKEY PA-B3 65W 1A1C (preferable for Librem 5 and Librem 14 charging, therefore I just bought one) or even AUKEY PA-B4 65W 2C (only when in addition some Samsung devices need to be charged there). This edit post main purpose is rather thought of mine that should help you to understand importance of USB-DCP charging protocol negotiation (every PD2.0, PD3.0 as well as PD3.1 negotiation, between power supply and end-device, actually starts at 5V and therefore I’m only focused on power delivery within 5V range, here where we are having dialog on charging of the Librem 5).
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