Unidentified chip from cheap phone amplifier

[botcrusher]

I've got this battery powered amplifier that sounds surprisingly fine and is rather loud when hooked up to a 6 Ohm HK195 driver salvaged from pc speakers, but the only visible chip on the thing aside from some 1AM transistors is a TA8803N - HT110609
The closest thing i can find is this: TA8800N

Seems like a rather odd chip to use?

attached is a pic of the board in question:
The only component on the reverse side is a 220uf 6V capacitor connected directly to the power in, which used to be 3xAAA but i've since attached a usb lead to it. If anyone wants a pic of the reverse side to see all the traces, by all means i'll post it.

Edit: oh, right. Power button is middle, volume up is left, volume down is right (board is upside-down so chip is readable)

[Andy Watson]

Would this fit the bill?
http://www.szczkjgs.com/UploadFiles/fujian/3572/TA8803.pdf

[botcrusher]

Perfect!
that makes a heck of a lot more sense than the other chip, thanks!
Now, i don't have an oscilloscope to get the full picture, but the "positive" lead for the speaker hits a max of -200mV on the loudest setting... it doesn't go positive at all.

[Andy Watson]

It claims to be a class-D amplifier, and it looks like it has a differential output too - without adding an appropriate filter the output signal will, more than likely, confuse a DVM. An analogue meter might show something sensible.