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TPS61240: Step-Up DC/DC Converter

Shai Berman
Mastermind 7400 points
Part Number: TPS61240

Hello Team,

  • We are using TPS61240 step up in our new design. When I looked into the D/S I saw that acceptable undershoot for L pin is only -0.3V, while for Vout and FB its -2V. Isn’t a contradiction, cause more transients are expected on L pin, due to coil switching current?

 

See how it looks like, when output is not loaded:

Ripple on VBUS_CAM at AC coupling when the load is not connected:

please advise back, thanks in advance.

Kind regrads,

Shai

  • 0
    TI__Mastermind 34201 points

    Hi Shai,

    The spec -0.3V and -2.0V in Absolute Maximum Ratings table are DC voltage. Since the lower switch in the IC has body diode which could not survive with a DC reverse voltage lower than -0.3V. The -925mV that you saw on digital oscilloscope is a transient behavior which last for only several nanoseconds. It's a normal behavior, won't cause damage to the device.