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LTM2881IV-5#PBF Transceiver IC 's Inbuilt DC-DC Converter

HI,

We are using  LTM2881IV-5#PBF IC, in our Project. Output of inbuilt DC-DC Converter is zero while measuring IC's ON Pin, it is 5V. so in which conditions the inbuilt DC-DC Converter 's output becomes Zero ?

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  • Thanks for the response,

    We will need a bit more information to debug this issue, 

    Can you capture an oscilloscope waveform of the LTM2881 VCC2 output voltage and VCC input voltage during either of these conditions: 

    • VCC is already powered up, switch ON from 0V to VL, trigger oscilloscope on rising edge of ON signal.
    • ON = VL. Bring up VCC from 0V to 5V, trigger oscilloscope on the rising edge of VCC.  

    What external circuitry, if any, are connected to the VCC2 supply output of the LTM2881? 

    Regards,

    Neil