Analog Switch Choosing and Power Consumption

Hello,

I'm looking for a switch which controlled by a MCU(3.3V) to control another high voltage power source(around 30V) on and off. I checked your product list and checked some datasheets. I have several questions on the analog switch.

1. For instance, your ADG 5419, the max voltage can pass the switch would be 40V, the supply voltage range is from 9 to 40 V and Icc is 70 uA. As this chip is an active component, what would be the power consumption of the chip besides the current on the on- resistance? 

2. If the supply voltage is very small (9V on Vdd and ground Vss), can the switch voltage be very high like 40V?

3. I would like to use my MCU as both power supply and control for the switch, do you have any other better chips for my application?

Thanks,

Jianlin

  • Hi Jianlin, 

    Thanks for your questions, please see my answers below.

     

    1. For instance, your ADG 5419, the max voltage can pass the switch would be 40V, the supply voltage range is from 9 to 40 V and Icc is 70 uA. As this chip is an active component, what would be the power consumption of the chip besides the current on the on- resistance? 

       The current consumption for the device is listed as IDD it is in the power Requirements section of the specifications table.

    2. If the supply voltage is very small (9V on Vdd and ground Vss), can the switch voltage be very high like 40V?

       No. Our devices are rail to rail operation switches. This means that they can pass a signal up to the power supply voltage rails.

    3. I would like to use my MCU as both power supply and control for the switch, do you have any other better chips for my application?

    If you are talking about using a 3.3 V supply we have many devices to cover this. However the signal would be limited to the power supply voltage.

     

    For lots more information please see our online selection guide:

    http://www.analog.com/media/en/news-marketing-collateral/product-selection-guide/Switches_Multiplexers_Product_Selection… 

     

     

    Regards,

    David