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UCC27528-Q1: Quiescent current of UCC27528 during steady state (ON or OFF )

Vasu Poojary
Intellectual 380 points
Part Number: UCC27528-Q1
Other Parts Discussed in Thread: UCC27528, UCC27301A-Q1, UCC27301A, UCC27311A-Q1, UCC27284

Hello Experts ,

In our application one of the constraint is Quiescent current drawn by gate driver should be less than 100uA (less than 50uA) is preferable .  Gate driver will be operated by DC ON or OFF signal  (not a switching application )

UCC27528 datasheet has below Iqq , Can we consider this as steady state current when gate output is not switching ?  (Either Gate output will be high or Low)

As per dynamic specifications , Gate driver current will be more than 1mA while gate output is switching .

Please clarify on this.

Also suggest if any Low IQ low side gate driver is available ?

thanks

Regards

Vasu

  • 0
    TI__Expert 5195 points

    Hi Vasu,

    The quiescent IDD current is at its lowest when the device is fully on and outputs are in static states (DC high or DC low). That specification you listed is when VDD = 3.4V, but below is a plot of the supply current vs. temperature at VDD = 12V, which is higher:

    If you need a dual-channel low-side driver with very low quiescent current, you can opt for the UCC27301A-Q1. That device is a half-bridge driver, but you can tie HB to VDD and HS to ground to essentially turn it into a dual-channel low-side driver. It also has an EN pin, which, if you use that to turn off the device, can bring the current down to 7uA. Below are the supply currents for that device:

    Thanks,
    Rubas

  • +1 in reply to Rubas Khalid
    Intellectual 380 points

    Hello Rubas,

    Thanks for clarifications and suggesting new chip.

     UCC27301A also has operating current of 2.5mA to 6mA which is higher .   We are using this gate driver to turn on LOW side MOSFET switch which will be either ON or OFF . In both condition we need to meet total operating current less than 50uA .

    Is any suggestion is there on this ?

    thanks

    Regards

    vasu

  • 0 in reply to Vasu Poojary
    TI__Expert 5195 points

    Hi Vasu,

    That operating quiescent current is for when the chip is switching. If you are using DC on/off conditions, then the current will be much lower. We do not have data on the quiescent current for when the driver output is DC high, but if you utilize the EN pin to disable the device output (like DC low), you can achieve very low current of 7uA.

    Thanks,
    Rubas

  • 0 in reply to Rubas Khalid
    Intellectual 380 points

    Hello Rubas,

    Thanks for clarifications

    Regards

    Vasu

  • 0 in reply to Vasu Poojary
    TI__Expert 5195 points

    Hi Vasu,

    I apologize, but I just realized that the UCC27301A-Q1 I recommended has cross-conduction protection, so you would not be able to have both outputs enabled at the same time. The UCC27311A-Q1 has the same low-current specs without cross-conduction protection, but it is not released yet.

    If you need a driver now with low quiescent currents, then I would recommend the UCC27284 (also a half-bridge). It does have higher operating quiescent currents, but it's still rated at 7uA when the device is disabled, which I have provided the specs below. Your may also be able to lower your quiescent current if you use a lower supply voltage.

    Thanks,
    Rubas