MAX9722 DirectDrive and TPS60130

theAnonymous1 · 19th January 2009, 05:52 AM

There isn't any reference on this forum (that I can find) to the MAX9722, so I figured I would share my latest mini project.

This is a headphone amp based on the MAX9722 DirectDrive IC powered by a TI TPS60130 inductorless charge pump. I opted to use the (B) suffix part which has the gain set internally to -2V/V. The circuit is DC coupled and I'm getting around 100mW of power into 17.5R earbuds before the amp goes into heavy clipping.

SineWaveAu7 · 19th January 2009, 12:28 PM

Nice. I've used a MAX232 chargepump to get +10-0-10 rails in a small motorcycle intercom prototype, but had to use 6 nimh cells with a LDO 5v regulator. This would've been such a space saving solution. Will take another look at it. ^_^
100mW is nuts for a headphone... Protect your precious ears, you only get two

- Adam

19th January 2009, 05:52 AM	#1
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	MAX9722 DirectDrive and TPS60130 There isn't any reference on this forum (that I can find) to the MAX9722, so I figured I would share my latest mini project. This is a headphone amp based on the MAX9722 DirectDrive IC powered by a TI TPS60130 inductorless charge pump. I opted to use the (B) suffix part which has the gain set internally to -2V/V. The circuit is DC coupled and I'm getting around 100mW of power into 17.5R earbuds before the amp goes into heavy clipping. __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

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19th January 2009, 12:28 PM	#2
SineWaveAu7 diyAudio Member Join Date: Dec 2008	Nice. I've used a MAX232 chargepump to get +10-0-10 rails in a small motorcycle intercom prototype, but had to use 6 nimh cells with a LDO 5v regulator. This would've been such a space saving solution. Will take another look at it. ^_^ 100mW is nuts for a headphone... Protect your precious ears, you only get two - Adam

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