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TLV704: TLV70433 5V to 3.3V overshoot issue

Jimmy Wang27
Prodigy 250 points
Part Number: TLV704

Hi team,

                 My customer use TLV70433 in their design, Vin=5V,Vo=3.3V ,Cin&Cout=1uF , they found overshoot from TLV70433 .

                 they try add 10uF or 22uF at output cap as same result , could you give me some comment? 

  • 0
    TI__Guru 55940 points
    Hi Jimmy,

    Some overshoot at startup is normal and common for LDOs. The cause of the overshoot is that during startup the LDO is in dropout. At this point the error amp is driving the gate of the PMOS pass FET to its negative rail (GND) so that the FET is fully on. When the output reaches the regulation point (3.3 V in your application), the error amp must transition off the negative rail which takes time. During this transition the output will continue to rise causing an overshoot.

    Very Respectfully,
    Ryan