Hi everyone,
I’m trying to identify a step-down regulator marked AMCH073. It’s used on the PEX power rail of a graphics card. I can’t find any datasheet or info online.
Here’s what I’ve observed:
• It has a QFN-16 footprint, similar to NB670.
• Pins 1, 2, 15, 16 are connected together and go to the inductor, so likely SW (switch node).
• Pin 9 is connected to GND, which doesn’t match NB670 (where pin 9 is SW).
• Pin 8 also seems to be tied to the same GND plane.
• The chip only says AMCH073, no manufacturer logo or other markings.
I tried replacing it with NB670, but the pinout doesn’t match — the regulator doesn’t work and may short.
If anyone has seen this chip before or knows a compatible replacement, I’d really appreciate your help.
I can share photos of the board and layout if needed.
Thanks in advance!
I’m trying to identify a step-down regulator marked AMCH073. It’s used on the PEX power rail of a graphics card. I can’t find any datasheet or info online.
Here’s what I’ve observed:
• It has a QFN-16 footprint, similar to NB670.
• Pins 1, 2, 15, 16 are connected together and go to the inductor, so likely SW (switch node).
• Pin 9 is connected to GND, which doesn’t match NB670 (where pin 9 is SW).
• Pin 8 also seems to be tied to the same GND plane.
• The chip only says AMCH073, no manufacturer logo or other markings.
I tried replacing it with NB670, but the pinout doesn’t match — the regulator doesn’t work and may short.
If anyone has seen this chip before or knows a compatible replacement, I’d really appreciate your help.
I can share photos of the board and layout if needed.
Thanks in advance!
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