TPS2660: TPS26600

HI Rakesh

The SHDN/ is pulled to 4.4V in my test when RTN is not connected to GND. if connecting RTN to GND, the pulled voltage is 2.7V, according the datasheet, the recommended operating condition for SHDN/ is 4V maximum, is the voltage ok (4.4V) for RTN is not connected to GND?

Best Regards

wang jian

Hi Jian,

What is the pullup resistor you used at SHDN/ pin ? Please use at least 10kOhm to limit current to <10mA as defined in the abs max rating table 7.1

Best Regards, Rakesh

Hi Rakesh

there is no pullup resistor in my test, the SHDN/ pin is left open.

Best Regards

wang jian

Hi Jian,

Can you please let me know what do you mean by "The SHDN/ is pulled to 4.4V in my test" statement in the above ?

Best Regards, Rakesh

Hi Rakesh

You mentioned above that SHDN/ is pulled to2.7V (typ) with 667Kohm (typ) , then in my test environment, the SHDN/ pin left open , i measured the voltage between  SHDN/ pin and GND pin using multimeter,  the voltage is 4.4V when RTN is not connected to GND.  if RTN is connected to GND, the measured voltage is 2.7V which is same to you mentioned.

So my question is: if RTN is not connected to GND, the 4.4V is higher than 4V which is the maximum recommended operating voltage in datasheet, is that acceptable? if ok, what's the maximum voltage for SHDN/ pin referred to GND? 

Best Regards

wang jian