Most modern inexpensive car radio amplifier ICs are internally bridged so that they provide 14W into 4 ohms at clipping with a 13.8V supply. The TDA1554 is stereo and the TDA2005 and TDA7240A are mono.
The TDA1562 stereo amp IC has a voltage doubler inside (class-H). It provides 48W per channel at clipping into 4 ohms with a 13.8V supply.
The TDA1562 stereo amp IC has a voltage doubler inside (class-H). It provides 48W per channel at clipping into 4 ohms with a 13.8V supply.