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LM74202-Q1: SHDN pin voltage rating

Part Number: LM74202-Q1


   I'd like to confirm SHDN pin voltage rating. the Absolute rating is 42V between SHND - RTN pin. however, in operating, 4V is shown, is 4V for SHDN to GND or RTN pin? There is an internal Avdd rail around 3.45V. so what's the max. absolute voltage rating? or different voltage rating depending on different pin?



  • Hi Alan,

    SHDNb is pulled to 3.45V with an internal pullup.

    Recommended operating voltage is 4V during normal operating condition. But this device supports reverse VIN polarity protection from field mis-wiring up to -42V VIN. When a input voltage polarity is reversed, SHDNb can see >4V with reference to RTN. This is why maximum operating voltage is as high as 42V. Let me know if you require more information 

    Best regards,