LM27761: LM27761

Adwait Deshpande

Part Number: LM27761

Tool/software:

Subject: Seeking an LDO to Generate -0.7V @ -1.39mA and -0.7V @ -1.5mA

I am looking for an LDO that can generate a negative voltage of -0.7V at currents of -1.39mA and -1.5mA. After searching through various options, I found the LM27761, which offers an output range of -1.5V to -5V.

However, since this range does not include -0.7V, I am wondering if there is an alternative LDO that can directly provide -0.7V. If not, could you please advise on how I might achieve this voltage using the LM27761 or any other method?

4 months ago

0 Andreas Mueller 4 months ago

TI__Genius 17630 points

Hello Adwait,

thanks for using E2E.

The LM27761 is an inverting charge pump combined with a negative LDO.

I'm not aware of any method to operate the LM27761 at a VOUT of -0.7V.

I think it would be best to use an inverting charge pump, such as the TPS60400 or the LM2776, to generate a negative voltage with some headroom (let's say for example -3V) and then add an extra negative LDO to reduce and regulate this voltage to -0.7V.

I will forward this thread to the LDO team to help suggesting a suitable LDO.

Best regards,

Andreas.

0 Prakash Lakhit 4 months ago in reply to Andreas Mueller

TI__Expert 4996 points

Hello Adwait,

Please take a look at our Adjustable Negative LDO https://www.ti.com/product/TPS723

Thanks,

Prakash L

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LM27761: LM27761