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I've done some looking but haven't been able to find a component that quite matches this one. It's on the output of a switching converter. The only markings on it are AG followed by a sideways F. The package is ~1.6mm x 1.2mm.

As a bit of background, I'm attempting to repair this circuit. After being led to that switcher by a thermal camera (output shorted to ground), I found that the pin from the switcher is shorting to ground across this component.

Any help would be much appreciated!

Circuit images showing component to identify

Best guess I've come up with is this MP62040DQFU power switch. Pinout makes sense. AG on package lines up with active-low on the datasheet, which makes sense with a single resistor on the enable to pull it back down once a shutdown signal is gone. It's really just the bars and sideways F that are throwing me, since they aren't mentioned on the datasheet nor on their package marking drawing

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  • \$\begingroup\$ Vishay has load switches (e.g. SIP4282) with a similar packaging and a plausible pinout. They also have to two letter markings, but I wasn't able to find one with a leading A. Just in case it doesn't turn out to be the LDO @Velvel suggested. \$\endgroup\$
    – nanash1
    Mar 1, 2023 at 9:52

1 Answer 1

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It possibly could be the BU2JTA2WNVX 2.85V LDO regulator from ROHM.

Marking:

![enter image description here

Pins/Signals:

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Package size:

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  • \$\begingroup\$ Looks promising, but from the layout it would seem pins 3 and 4 are reversed for it to make sense. Maybe a similar part. \$\endgroup\$ Mar 1, 2023 at 8:21
  • \$\begingroup\$ @TomCarpenter Indeed, I would've been happier if pins 3 and 4 were reversed. But it's not entirely ruled out (yet). It all depends on where the pin 4 via connects to. VIN could be connected to one power supply, and STBY to another. \$\endgroup\$
    – Velvet
    Mar 1, 2023 at 8:29
  • \$\begingroup\$ The resistors to the right could potentially be a voltage divider for an adjustable LDO. \$\endgroup\$
    – Lundin
    Mar 1, 2023 at 12:34

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