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ALM2402F-Q1: Current Consumption

Mark Philip Felipe
Genius 9705 points
Part Number: ALM2402F-Q1

Hi Team, we would like to seek clarification regarding the total current consumption of the device for proper LDO selection. Can we consider the Iq?

Thanks in advance.

Regards,

Mark 

  • 0
    TI__Guru 52871 points

    Hi Mark,

    I think that I need to more information from you. It will be helpful if you are able to send me the schematic, since I do not have ALM2402F-Q1 load information (AC or DC) and voltage rail information. 

    Iq in the worst case scenario is approx. 6mA (from p.6 of the datasheet), see the attached image.

    If the application is required to source and sink up to +/-400mA, LDO should be rated at least +/-500mA for the required voltage rails. I also need more information about LDO power efficiency, input and output voltage, temperature operating range etc. (need to know de-rating of the LDO). If 12V is used as the supply voltage rail, 500mA load will generate 6W of power dissipation across the LDO minimum (assume the efficiency is 50%, then LDO will have to dissipate 12W of power at the max. load) So it is difficult to make a recommendation without design details. 

    Best,

    Raymond 

  • 0 in reply to Raymond Zhang1
    Prodigy 20 points

    Hi Raymond/Mark,

    Its is for automotive application, temperature ranging between -40 DegC to 125 DegC. LDO required is 15 to 12 V need to finalize the load current requirement based on the current consumption of ALM2402f-Q1 IC.

    Resolver excitation winding impedance is 58 Ohm (R = 12.1 ohm, L =0.903 mH), Excitation voltage requirement is 7Vrms.

  • 0 in reply to Priyanka Yussuf
    TI__Guru 62550 points

    The maximum IQ of ALM2402F-Q1 is 5mA per amplifier so for the dual ALM2402F-Q1 the maximum total IQ is 10mA.  However, a selection of the LDO to power ALM2402F MUST be based on the max IQ plus maximum load current, Iexc, which is a function of the Vout peak voltage.  Thus, LDO must be able to deliver peak output current to the complex load plus 10mA.

  • 0 in reply to Priyanka Yussuf
    TI__Genius 10850 points

    Hi Priyanka,

    We haven't heard from you in a while. We hope the issue was resolved. Closing this thread now. Reply to re-open if you have any additional questions.