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Add more information on top marking from MPS
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Looks like it might beIt's most likely an MP65151DJ from Monolithic Power Systems. For reference from the datasheet (pdf):

enter image description hereScreenshot of MP65151DJ datasheet, showing top marking information and pinout

Note the TSOT23-6 chiptop marking of AAN"AAN" for an active-high single switch TSOT23-6 chip. Package information from MPS for a TSOT23-6 package (pretty surepdf) indicates that the vertical line in your picture is the pin 1polarity/polaritypin-1 indicator, the first three letters are the package code, and the last letter is a date code.

Top marking encoding schema from MPS document

From an MPS document detailing the date code (pdf), it looks like "J" means your part was made in 2018. 

The circuit on your board seems to match the pinout as well (pin 2 = GND, pin 5 is a resistor to GND, pin 6 looks like an output with some output capacitance, etc.)

Looks like it might be an MP65151DJ from Monolithic Power Systems. For reference from the datasheet (pdf):

enter image description here

Note the TSOT23-6 chip marking of AAN for an active-high chip (pretty sure the vertical line in your picture is the pin 1/polarity indicator). The circuit on your board seems to match the pinout as well (pin 2 = GND, pin 5 is a resistor to GND, pin 6 looks like an output with some output capacitance, etc.)

It's most likely an MP65151DJ from Monolithic Power Systems. For reference from the datasheet (pdf):

Screenshot of MP65151DJ datasheet, showing top marking information and pinout

Note the top marking of "AAN" for an active-high single switch TSOT23-6 chip. Package information from MPS for a TSOT23-6 package (pdf) indicates that the vertical line is the polarity/pin-1 indicator, the first three letters are the package code, and the last letter is a date code.

Top marking encoding schema from MPS document

From an MPS document detailing the date code (pdf), it looks like "J" means your part was made in 2018. 

The circuit on your board seems to match the pinout as well (pin 2 = GND, pin 5 is a resistor to GND, pin 6 looks like an output with some output capacitance, etc.)

Source Link
Cheibriados
Cheibriados
  • 1.2k
  • 9
  • 12

Looks like it might be an MP65151DJ from Monolithic Power Systems. For reference from the datasheet (pdf):

enter image description here

Note the TSOT23-6 chip marking of AAN for an active-high chip (pretty sure the vertical line in your picture is the pin 1/polarity indicator). The circuit on your board seems to match the pinout as well (pin 2 = GND, pin 5 is a resistor to GND, pin 6 looks like an output with some output capacitance, etc.)