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

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.

  • 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

  • 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.

  • 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