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Can TPS7A4501DCQ 1.5A Output Current device operation and function properly during constant switching?

Vishal A1
Intellectual 540 points
Other Parts Discussed in Thread: TPS7A45

Hi Team,

We are using the device TPS7A4501DCQ for charging the battery in our design and we would like to know if the device can function properly and provide the required regulation of 11.5V@1.5A while switching the device supply constantly ? i.e If the device input is switched on for Ton period(say 925mS) and switched off for Toff time(say 12.5mS) ,will the device perform its expected functionality properly during the on time? Will there be any impact on the device IC if this is constantly switching as mentioned for long run? Kindly let us know your feed back on this.


Link for Part Datasheet :www.digikey.in/.../2262065

  • 0
    TI__Guru 50190 points

    Hi Vishal,

    The TPS7A45 is a linear regulator that does its best to regulate the output voltage. What this means is that every time you try to turn it on, it will likely ramp right into current limit and then thermal shutdown 

    What is nice about a device like the LM317 is that it thermal current limit foldback which means as its die gets hot, it will fold-back the current limit which helps to minimize the problem I mentioned above. 

    If this does not answer your question can you share more details on what you are trying to make?

  • 0 in reply to JCHK
    Intellectual 540 points

    Hi John,

    My query is related to the frequent turning on and off the LDO supply .How many times can the LDO be turned on and off in a minute?Will there be any effect/damage on the the device due to this constant switching On and Off the input supply of this LDO? In out design we will be switching it on and off once in every 30 seconds (29.6 sec On time and 0.4sec Off time ).Is this Ok?

    The Expected output during this turn on period(29.6 sec) is 11.5V @ 1.4A and during turn Off time(0.4 sec) the expected voltage should be 0V at the output.Kindly let me know if this works fine with this LDO part for long run(say 1 year)

  • 0 in reply to Vishal A1
    TI__Guru 50190 points

    Hi Vishal,

    We don't have characterization data on the propagation delay from VIN/SHDN going high and the output rising. That being said, whenever you enable this, the device would likely immediately hit current limit and likely thermal shutdown. This would be a function of the difference between the input voltage and the voltage at the output. 

    I suggest you order and EVM to try this out so you can see how it actually performs. 

    Does this help to clarify?