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LM350AT as 1.2V LDO

Hi, can LM350AT/NOPB (TO-220 package) be used as 1.2V LDO with 3A max current if the Adj. pin is shorted directly to GND? In the datasheet only an application circuit is shown for electronic shutdown application where the output becomes 1.2V when Adj pin is connected to GND using a switching transistor and load draws minimum current at 1.2V. But in my application I want max. current at 1.2V and I am not sure from datasheet whether it can supply it.

  • Yes.

    I presume that you are referencing : Figure 27. 5V Logic Regulator with Electronic Shutdown

    Per formula 3 on page 8 of the datasheet, with R2 = 0 ohms (i.e. the ADJ pin is shorted to GND) the output voltage will be equal to the Reference Voltage ... 1.250V typical.

    As for the 3A output current, as long as you have adequate Vin-Vout differential voltage the 3A should not be a problem.

    Per Figure 4 on page 4 of the datasheet, an input-output voltage differential of approximately 3.5V is typically required to ensure that the output current can reach at least 3A. That means that with Vout= 1.25V, the input voltage needs to be at least 4.75V. The datasheet specifications call for a Vin-Vout differential voltage of 5.0V (i.e. Vin= 6.25V if Vout=1.25V) to ensure the 3A.