• State TI Thinks Resolved
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 94 views
  • Users 0 members are here
Support feedback
Options
Options
Related

TPS610985: switch peak current limit 350 mA or 50 mA

kazola
Guru 18595 points
Part Number: TPS610985

Tool/software:

Hi all,

In the datasheet on page 1, under features, it says "Minimum 350-mA switch peak current limit".

But later in the same page it says "The TPS61098x can provide up to 50-mA total output current at 0.7-V input to 3.3-V output conversion".

Find the datasheet here:

www.ti.com/.../tps610985

We reviewed the datasheet and we don't understand what the actual current limit is. I don't understand the second statement. 50 mA is close to our peak load, we are running 2 x AA alkaline batteries.

I would appreciate some insight on this topic.

Thanks a lot.

  • 0
    TI__Genius 13275 points

    Hi Kazola,

    Please see the description in Chapter 8.3.5.

    The boost converter of the TPS61098x supports a cycle-by-cycle current limit function in boost mode operation. If the peak inductor current reaches the internal switch current limit threshold, the main switch is turned off to stop a further increase of the input current. In this case the output voltage will decrease since the device cannot provide sufficient power to maintain the set output voltage.

    It stands for the peak inductor current, the upper l=line as is shown.

    Typical value is 500mA.

    If your input is 0.7V, 3.3V is the output, 50mA load current, then the average input current is no less than 235mA, peak inductor current is about 285mA. It's suitable.