I cannot find/ know how to make a 50mW x 2 channel amp that can run off of 2-5v? any help
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I cannot find/ know how to make a 50mW x 2 channel amp that can run off of 2-5v? any help

[From: ] [author: ] [Date: 11-11-19] [Hit: ]
LM386 will generate about 150 mW at 4 volts,But at the lower extreme of voltage, they tend to have high distortion.But given the high impedance load (headphone), Id look at a headphone amp, such as the MAX9724A,......
I am looking for an Ic or an amp that can deliever 50mW x 2 for a headphone amp. I have looked everywhere and cannot find a "through hole" ic. Anyone know where there is one? Thank you!

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There are plenty of audio amp ICs. Some will operate on 6 volts, and a few lower.
TBA651 will generate 1 watt at 6 volts, but you will need 2 ICs.
LA4440 will generate about 2 watts at 6 volts, dual channel
LM386 will generate about 150 mW at 4 volts, single channel

But at the lower extreme of voltage, they tend to have high distortion.

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But given the high impedance load (headphone), I'd look at a headphone amp, such as the MAX9724A, MAX9724B, 2.7V to 5.5V Single-Supply Operation, 63 mW into 32 ohms. But this is a surface mount package. I suspect, because of the limited space in most applications, they will all be surface mount.

Given all this, I'd look at the LM386.

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My guess is someone makes an op amp that has one or both channels in a single package. 4 volts at 20 milliamps is 80 milliwatts, which should be enough for class AB, if your gain, and duty cycle requirements and fidelity requirements are moderate. Neil
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