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LDO that starts below 1.6 VDC

Other Parts Discussed in Thread: LP2951-N, LP2950-N, LM9076

I have an odd requirement:

* Vin 1.5VDC to 26VDC

* Vout anything from 1.0 to 5 VDC; need not be regulated below 5 VDC, but I need to to start at 1.5 VDC in, and get 1.0 VDC Out

* 40 mA

* prefer TO-92

The part that came closest is the LP2950-3.3 and LP2950-5.0; both have output that starts at 1.7 VDC, but output is only 0.6 VDC at the voltage. 

At 1.8 VDC in, I get 1.2VDC out; almost good enough, but I need to start a bit lower.

LM9036Q had no output until 4 VDC Vin

Any other parts I might try?

  • Hi Ron,

      How about LP2950-N/LP2951-N, it has a "Output Programmable From 1.24 V to 29 V",  the typical dropout voltage is 380mV @100mA, so I guess you may get a 1.0V output voltage with 1.5V Vin.  Below is the Dropout Curve just FYR.

     Another possible one is LM9076.