-Forward voltage of- -ZLLS410- S4 diode. Edited- This is NOT a Zener mod

[wight]

@Rufusbduck

The LD2981 is a sot-89 package with a low enough dropout to be suitable for 2S. I was attracted to it by the pin compatibility with the 7135. Vin is the same as Vdd, Vout is the same as Led-, Gnd=Gnd. A Zener board with the lfpak 56 and lvp mod would certainly be suitable too. It’s not something I’ll lose sleep waiting for that’s for sure.

Ouch, I forgot that you’d purchased them in an SOT-89 package. I took a glance at the LD2981 and in the SOT-23-5 package it probably is pin-compatible with other similar regulators such as MIC5235 and LT1761.

Here’s what I’ve been working on today that includes an LFPAK56 footprint.