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Original question:

TPS62742: Reducing power consumption by adding pullups?

TPS62742: The Pin6 Load's output voltage can't remain steady 3.3V when drive a heavy load with 250mA Current under the control of pin4 CTRL

user5329839
Prodigy 10 points
Part Number: TPS62742

I use this IC to output  250mA current to my load system, using the pin6 LOAD to drive the WIFI module under the control of pin4 CTRL,  but I found when I activate the ctrl pin to output 3.3V to load,the load's 3.3V doesn't remain steady, Should I add the value of capacitance to improve this issue?   I just use the TPS62742's reference design.  a 10uF ceramic capacitance is placed near pin1 , there are another  22uF ceramic capacitance and 2.2uH power inductor in series with the PIN2 and PIN5. 

but after I tune off the voltage to Load system, then the 3.3V voltage can remain steady. So what I should do just to add the value of the capacitance? But the datasheet tells us 10uF ceramic close to the 2.2uH inductor is sufficient for 400mA current output?

  • 0
    TI__Expert 5415 points
    I am not sure whether I understand your problem correctly.

    According to the datasheet the switch supplying LOAD (pin 6) typically has 0.6Ohm (max 1.25Ohm) resistance. If you connect a load current of 250mA to this output I would expect to see significant voltage drop (>150mV), following the load current profile.