Hi, I checked http://www.ti.com/lit/gpn/tps76301 to power the LM4550 analog supply. Its VI = VO(typ) + 1 V, which means the VI needs 5.3V typically. The LM4550B needs at 4.2V(min.). That's why you chose 4.3V I think. The input voltage if defined as a range of 4.75 ~ 5.25V on DC jack, so this new idea 4.3V for LM4550 must not work reliable.
just let you know first, I'm surveying other chip for this then. If you have other alternatives, pls let me know. -- Thanks, Adam <http://www.nanonote.cc/>
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