Created
January 30, 2025 01:58
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TL431 regulating "5V" USB supply 4.75-5.5V range to limit under 5.032 V, simulated in circuitjs
If put a 1kohm potentiometer in the middle of the divider, then the resistors of the divider could be off by 5% and still could get a 5.035V regulated voltage: 
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When divided in 2, the range becomes 2.373-2.516V, which lies within the iCE40 LP/HX LVCMOS25 recommended range of 2.37-2.62V.
When divided again in 2, the range becomes 1.186-1.258V, which lies within the iCE40 LP/HX core's recommended range of 1.14-1.26V.