AD22105 Simple temperature control

I have recently been developing electric heating pad. My product is a very simple, I run 5v through a circuit to generate heat. Currently I am using a bimetallic switch that opens when temperatures exceed 45C.  I am currently looking for alternative methods that will be low cost but provide higher levels of accuracy and reliability.  I was thinking surface mounting AD22105  my heating pad and use that as a temperature controller.  A concern of mine is that it wont provide adequate output voltage/current.  I was wondering if I could get your feedback on if the  AD22105 would work for my application or perhaps you have another product/products that would help provide me with a low cost temperature controller.

  • 0
    •  Analog Employees 
    on Sep 29, 2016 7:51 PM over 4 years ago


    Apologies for the delayed response. The rest of our Temperature Switches offerings can be found here. You might want to look at the ADT6401/ADT6402, it's cheaper than the AD22105 but the AD22105 is still more accurate. The trip point setting for the ADT6401/ADT6402 is easier; it is pin-selectable, no need for external resistor. The overtemp outputs are usually in the order of a few mAs, with the AD22105 capable of pulling down with 10 mA at a voltage of about 375 mV.

    The E grade of the TMP01 has better accuracy, can sink 20mA with at a voltage of about 600mV (typical). You might want to check on Figure 7 of the TMP01 TPCs. It is more expensive than the other 2 options above.

    Hope this helps.