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LM4132: VREF overshoot at startup

Part Number: LM4132



My customer is using LM4132BMFX-3.3/NOPB for Vin=5V and Vout/Iout=3.3V/15mA as follows.

edit:removed schematic


The following is the startup waveforms of IN and VREF.

VREF has some overshoot.

Any suggestions to prevent this VREF overshoot at startup?

Best regards,



  • Hi Hirano,

    The LM4132 has no internal circuitry to prevent overshoot. The only way to stop it is to increase the capacitance around the device to slow the output until the internal circuitry is up and running. The overshoot happens because the internal circuitry is not fully on.

    Please remove customer schematics if you do not have permission to share on a public forum.