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LM1117: Can I increase maximum current output with increased Vin?

Paul Kafig24
Prodigy 60 points
Part Number: LM1117
Other Parts Discussed in Thread: LM317

The data sheet for this part says, "The LM1117 is a low dropout voltage regulator with a dropout of 1.2 V at 800 mA of load current."

We have an application where I'd like to get more current from the device. If I increase Vin to 16V, will this also increase the max current output of the device? I believe the answer is no, but though I would ask.

As a side question, what limits the current output? Is it physical size or some other factor? Thank you.

  • 0
    TI__Mastermind 23361 points

    Hi Paul, 

    Inside the LDO, there is a control loop that will turn off the pass-FET when the LDO is exceeding the current limit. There is another loop that will shut down the LDO when hitting the thermal shutdown. The maximum current limit is normally decided by the physical size of the pass-FET switch. 

    For LM317, here is the current limit spec and changing Vin will have little effects on the current limit unless the device is hitting thermal limitation. 

    Regards, 
    Jason Song