I can't seem to identify this. It's a 1117c but I need to find the correct output voltage. I don't recognize the manufacturer logo. Thanks in advance.
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1 Answer
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12
It's a Burr-Brown/TI/AMS/NatSemi LM1117 regulator.
Normally, LM1117/AMS1117 family has a wide range of members having fixed outputs (e.g. 1.2V, 1.8V, 3.3V). But probably, this one is the adjustable one. To be sure, look for a resistor pair connected to the 1st (leftmost) pin or put a bigger picture showing wider area.
answered Mar 5, 2018 at 9:08
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\$\begingroup\$ You sure it's a Burr Brown? That's the first I thought it was but I can't find a 1117c datasheet and it looks like what I can find has a "bb" prfix on the marking guide. \$\endgroup\$ Mar 5, 2018 at 9:29
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\$\begingroup\$ Ah yes, Burr-Brown has BB symbol. Edited my answer but this does not change the actual result. AMS1117 datasheet has a table indicating that the model with CD suffix is the adjustable one. So probably, the one in your picture is the adjustable one. The last sentence of my answer still applies. \$\endgroup\$ Mar 5, 2018 at 9:46
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\$\begingroup\$ @RohatKılıç The CD suffix is only for the TO-252 package. \$\endgroup\$ Mar 5, 2018 at 10:12
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1\$\begingroup\$ I think it's a 1.2 v fixed. You see the other 1117c on the board? It has 33 where the 12 is on the 1117c in question and it outputs 3.29v. I'm guessing it's a bad unit. I get 0.23v on the output and it's severely overheating. Unless you think an out of spec output capacitor would cause this? \$\endgroup\$ Mar 5, 2018 at 10:45
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1\$\begingroup\$ @SweetPoontang If you measure 0.23V across the output then probably there's a short at the load, not in the regulator. If the device was damaged then it wouldn't get hot. The culprit is in the sub-circuit that the regulator supplies (Maybe an IC, or a broken/shorted capacitor --I've seen a lot of shorted MLCCs, by the way. There may be one in your circuit as well). \$\endgroup\$ Mar 5, 2018 at 10:48