3V battery to 5V supply

[Dimitree]

hello,
my Vox Amplug was broken: no sound could be heard and the pcb got really hot when I powered the circuit. I discovered that one of the ICs was bad, in particular, the one that should supply 5V to the circuit, from 3.3V supplied by batteries. Unfortunately I can't understand what kind of IC is that, what is written on it is:

RDU (or maybe PDU or BDU, it's too tiny)
79J
P3XL
(10 pin TS-SOP format)

I tried to put 5V directly after that IC using an external supply, and the Amplug works again. Now I'd like to "restore" the 3V-battery-to-5V capability..what kind of IC could I use? I don't have many room there so I could only use 1 single chip and in SMD format..so it should be self regulated.
There is also a 220µH inductance there, if this could help identify the kind of IC used..

[Digital Larry]

It sounds like a switching DC-to-DC converter.  I'd be hesitant to just replace the chip because there might be another component failure (usually a capacitor) that caused the IC to fail.  I tried googling your part number fragments and nothing leapt out at me.

[GibsonGM]

You might try calling VOX, and talking to their tech department - they'd have a lot more info on the circuit.  And if you can find a schema of the thing, that would help tons!  But it may be unavailable....

[mistahead]

^ What he said.

Ask Vox - they are pretty approachable about their stuff I've found.