Help Identify Fan Control IC

[Harimake]

I'm trying to identify the IC in the Fan control circuit I'm repairing.
Markings: CF** (CFC3 in my case)
Package: SOT23-5

Here's the schematics I was able to RE:

[Harimake]

I feel so dumb... earlier I dismissed my initial hunch that this is a voltage regulator of some sort. Now, after doing some more digging, this does look like a 3.3v buck controller using the fet to oscillate. This explains the difference in in/out voltage.
Now I have a couple of candidates for a replacement now, but still... which one is the original with CF markings?

[fzabkar]

To me it looks like an op amp. Q1 is the pass transistor.

This part (MCP6001U) has the right marking but wrong pinout (pins 2 and 3 swapped):

https://ww1.microchip.com/downloads/en/DeviceDoc/MCP6001-1R-1U-2-4-1-MHz-Low-Power-Op-Amp-DS20001733L.pdf

[Harimake]

To me it looks like an op amp. Q1 is the pass transistor.

This part (MCP6001U) has the right marking but wrong pinout (pins 2 and 3 swapped):

https://ww1.microchip.com/downloads/en/DeviceDoc/MCP6001-1R-1U-2-4-1-MHz-Low-Power-Op-Amp-DS20001733L.pdf

I think you are onto something... I forgot about the opamp.
The pin numbering in my diagram is not correct, the pins are there to show the physical location on the sot-25 package as I was reversing them. MCP6001U has Vss as the middle pin (#2), which is the GND pin (#3) on my diagram. I think it's a match and makes more sense than a buck controller.

[fzabkar]

Since your pin numbering is incorrect, I would just like to point out that this chip comes in several different pinouts.

[Harimake]

I double checked and the MCP6001U seems to be a perfect match. Thanks again for the suggestion.