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TPS1H100-Q1: TPS1H100-Q1 DC Current can reach 4.5A or not

user4370495
Expert 1155 points
Part Number: TPS1H100-Q1


Dear E2E :

i  Read TPS1H100Q1 Ver.B Datasheet , Some spec i  was a little confused.
a. 7.1 Absolute maximum Ratings ---- Continuous drain current  (Internally limitied  A);
b. 7.3  Recommended Operationg Conditions-----Nominal DC Load current  (0-4A); 
    Operating Junction Temperture range -40 to 150.C

Does Nominal load current can reach 4.5A or 5A when Junction temperture range below 150.c.
for example: Rcs=Vcs/Ics=4*500/5=400 Ω； Rcl=1.233*2000/10=250Ω。 (VS=12V)
I want to know ,  it's ok or not ?
thanks a lot.

  • 0
    TI__Mastermind 28340 points

    Hello,

    The limitation is in peak current and junction temperature. There is no issue for limiting the current to 5A. But you have to consider the thermal Tj - Ta = THETAja x Ron x square(IOUT).

    Tjmax = 150C, Ron at 150C = 166mOhm, and load current = 5A, that means the max ambient temperature = 150C - 41C/W x 0.166Ohm x square(5A).

    Ta(max) = 150C - 170C = -20C.

    The device can not run at 5A in steady state because it will shutdown immediatly.

    Regards

  • 0 in reply to Mahmoud Harmouch
    Expert 1155 points

    Dear  E2E:

    Thanks a lot . 
    i want to know which area  does copper area mean? Under the IC package  or  all the GND Plane in the PCB ?
    In the 2-layer PCB Layout. it means 6mm*6mm*2=72mm2  or  more than that.

  • 0 in reply to user4370495
    TI__Mastermind 28340 points

    Hello,

    The copper area is the area of the ground plan that is connected to power pad through vias. This plan is a heat sink. I hope this answers your question.

    Regards