Help identify SOT23-5 marked LAD

[geeja]

I'm trying to find the part number for this 5 pin SOT23. It is marked as LAD. I think it's an Analog Devices or TI voltage regulator.

[mengfei]

check out the link, hope it's there

http://www.digikey.hk/Web%20Export/Supplier%20Content/MCC_353/PDF/MCC_SMD_Marking_Codes.pdf?redirected=1

[geeja]

check out the link, hope it's there

http://www.digikey.hk/Web%20Export/Supplier%20Content/MCC_353/PDF/MCC_SMD_Marking_Codes.pdf?redirected=1

unfortunately that's just for MCC parts.

[bktemp]

TI has a LADQ marked device:
http://www.ti.com/product/lmv331-q1

[wraper]

Don't know what it is but seem to available for purchase  http://www.aliexpress.com/store/product/MARKING-CODE-SMD-5pin-LAD-SOT23-5-PACKING/1747258_32295379429.html

[geeja]

Here's some more info I've measured on a working unit.
pin#
1: 5v
2: GND
3: 3.3v
4,5 : 1.8v
pins 4 and 5 are shorted together which is odd. Seems like a 1.8v voltage regulator with enable but 4 and 5 shouldn't be shorted together.
The marking seems to follow TI or Analog Devices convention, but the TI mark search for LAD turns up no match.

[bktemp]

The TI marking search gives a a few matches, but only one with SOT23-5, but it is marked LADQ. Therefore it is probably not a TI part.
I tried a few other marking code searches, but all show the same part.

Could it be a voltage supervisor? Then the shorted pins could make sense (disabled external reset input).
Voltage supervisor ics have a different marking for each voltage variant and are therefore rarely listet on marking code sites because a single ic would fill a whole page with all its variants.

[wraper]

Here's some more info I've measured on a working unit.
pin#
1: 5v
2: GND
3: 3.3v
4,5 : 1.8v
pins 4 and 5 are shorted together which is odd. Seems like a 1.8v voltage regulator with enable but 4 and 5 shouldn't be shorted together.
The marking seems to follow TI or Analog Devices convention, but the TI mark search for LAD turns up no match.

Are you sure that pins 4 and 5 are shorted, not just same voltage? Some regulators have pin 4 as power good output with open drain which is then connected with resistor to Vout. Many regulators have pin 4 as NC, somebody could decide to connect it to Vout for some reason too.

[geeja]

Yes, 4 and 5 definitely shorted together. Measured the board with and without chip installed.

[bingo600]

These are the ones i have in the smd book




/Bingo

[geeja]

Unfortunately, none of the above looks right, still think it's an Analog Devices part, does anyone have an Analog Devices lookup?

[arny]

check this out

http://datasheetz.com/data/Integrated%20Circuits%20%28ICs%29/Voltage%20Regulators%20-%20Linear/NCP561SN15T1OSCT-datasheetz.html

[c4757p]

still think it's an Analog Devices part

why?

[geeja]

Thanks to everyone that replied. I found it,
http://www.analog.com/en/products/power-management/linear-regulators/adp2108.html

I saw that there was an inductor and cap hanging on what should be an output pin 1 and started looking at Analog Devices switching regulators and found it.