Help identifying AMCH073 regulator or finding a compatible replacement

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  • taurtnt
    taurtnt
    • Jan 2025
    • 5
    • Romania

    #1

    Help identifying AMCH073 regulator or finding a compatible replacement

    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!
  • R_J
    Badcaps Legend
    • Jun 2012
    • 9556
    • Canada

    #2
    NB671LBGQ-Z
    If pins 1 & 2 are connected together you likely have a short on the Vin to ground.
    Attached Files
    Last edited by R_J; Yesterday, 03:56 PM.

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