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Original question:

TINA/Spice/CSD22204W: CSD22204W

CSD22204W: CSD22204W using for reverse polarity protection for coin cell battery oprated system

Raghunath Pol1
Prodigy 200 points
Part Number: CSD22204W
Other Parts Discussed in Thread: TIDA-00757, CSD25202W15, CSD23202W10

Hello Guys,

I am using CSD22204W in one of my design for reverse polarity protection. input is coin cell battery (3V)

Can please confirm can I go ahead with this or any modification required .

-Raghu

  • 0
    TI__Mastermind 30875 points

    Hi Raghu,

    Thanks for your interest in TI FETs. Your implementation looks OK. You can see similar example in the TIDA-00757 reference design. Please keep in mind that if your battery voltage drops below 2.5V, then we cannot guarantee rds(on) as VGS = 2.5V is the lowest voltage at which rds(on) is specified in the datasheet.

  • 0 in reply to John Wallace1
    Prodigy 200 points

    Thanks for confirmation.

    Battery is connected to Drain of PFET, Load is connected to Source of PFET, When VGS 0V mosfet will be ON? 

    My worry is Mosfet will be on?

    If not Can you please  suggest suitable part to operate battery voltage 2-3V.

    Regards,

    Raghu

  • 0 in reply to Raghunath Pol1
    TI__Mastermind 30875 points

    hi Raghu,

    Yes, the battery is connected to the drain and the load is connected to the source of the FET. Initially, current flows thru the body diode of the FET, charging the source node. The gate of the FET is pulled to GND (VGS = 0V - Vsource) and when Vsource > Vth, the channel will begin to conduct. TI has a number of P-channel FETs with rds(on) rated down to VGS = 1.8V or below. Take a look at the CSD23202W10. It's a smaller device with single-ended G-S ESD diode which gives a lower leakage than the back-to-back ESD diode of the CSD22204W. This may be an important consideration for a battery operated application. In the same size package, you can take a look at the CSD25202W15. It also has single-ended ESD diode from gate to source.

  • 0 in reply to John Wallace1
    Prodigy 200 points

    Thanks a lot John Wallace for swift response.