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[FAQ] LM25118: Why can't operate when Vin is lower than 4V?

Expert 8980 points

Replies: 1

Views: 56

Part Number: LM25118

Hi team,

My customer used this device in their system but they need support Vin voltage low to 3.5V.

But currently they found when input voltage is lower than 4V, our device will be off.

Below is their circuit and please advise which portion we need to modify.




Texas Instruments


  • Hello Paul,

    The device needs an initial startup voltage of 5V. Otherwise the voltage on VCC might not rise above the UVLO threshold of 3.7V typically.

    Best regards,

    For more information on buck-boost devices have a look at www.ti.com/buckboost