I am using the LMH6554 which needs -0.9V for the negative power supply (low noise required), but I just can't find a suitable LDO regulator...
So, is there any solution for that? thanks.
you can reference a negative LDO, like the TPS7A30, to a positive rail to achieve a -0.9 Vout.
Also, assuming that the -5.2V rail is fairly stable and low noise (though you could use an RC filter to clean it up) you could also use this same -5.2V voltage to offset the reference voltage at the feedback pin to get the LDO to set a Vout voltage lower than its own reference.
Can you specify how to use TPS7A30 to generate a -0.9V Vout more detailedly? I'm in trouble on how.
Please see the below app note regarding how to regulate an output voltage lower than its reference. By biasing the resistor divider network differently, one can achieve this.
Thank you very much for your reply, it helps.
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