I'm aware the same question has been posted before, but unfortunately, it has not led me to an answer.
I have a small PCB in which I've added an LDO to convert input voltage to 3.3 V output voltage.
The LDO in using is the AP2210-3.3TRG1 (datasheet). My understanding from the datasheet is that with an input voltage of 4.3 V - 13.2 V. (4.3 V because the manufacturer recommends Vout + 1 V). I'm supplying 9 V input voltage from a battery.
My schematic is as follows:
I'm expecting to get 3.3 V as output voltage. When I measure the output voltage, however, my multimeter reads only 0.5 V.
I've gone through the datasheet to see if I've misunderstood or missed something, but I can not manage to figure it out. There's also some stuff I do not really understand, which doesn't help.
So some concrete questions. Do I have some mistake in my schematic? Am I misunderstanding how to use this component?
I hand soldered the part on a PCB (with hot air), is it possible I overexposed it to heat?
Thank you all for your answers!
Some additional information:
The load is an ESP8266 (datasheet). I've measured the current at the LDO output, which is ~135 mA.
When I measure the voltage at the same spot I get 1 V now. In the original post, I reported reading 0.5 V, but I must've been mistaken since nothing has changed and now I get a solid 1 V (which is still lower than expected).
In regards to "Power Dissipation"; I get the following results (as per page 23 of the LDO datasheet):
(150°C - 25°C) / (0.135 A × 200°C/W) + 3.3 V = 7.93 V
This is a lower voltage than I'm supplying. Can this be the issue? The datasheet says:
Therefore, for good performance, please make sure that input voltage is less than ...
I'm going to find a 5V power source and see what happens!
Results I supplied ~4.8V and measure the following values at Vout:
I also feel the LDO is getting significantly hotter now, but I've not verified that.
Adding a screenshot of the board design.
resistors on top layer are 10k ohm resistors.
C1 is a 1 uF cap and C2 is a 2.2 uF cap.
U1 is an ESP-12F