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Original question:

TPS22910A load switch transition

TPS22910A: load switch transition

Anil Babu
Prodigy 90 points
Part Number: TPS22910A

Hi,

I'm planning to use TPS22910A and TPS22913B load switch for one of my battery operated circuit.

The switch is  just used to connect battery output to a resistor divider network ( battery ---TPS22910A/TPS22913B----- Resistor divider). Switch is enabled by Microcontroller GPIO.

1. Do I need to still connect an output capacitor ( C load) ?

2. Data sheet says output capacitor as optional. What is the significance of the same ?

3. What slew rate will be the switch working with no output capacitor connected ?

4. My load current is only 12-15 Micro amperes.

Thanks

Anil

  • 0
    TI__Genius 10855 points

    Hi Anil, 

    Thanks for reaching out on E2E!

    Please find the answers to your questions below:

    1. Do I need to still connect an output capacitor ( C load) ?

    [AH]: A load capacitor isn't necessary for the load switch to function correctly. The purpose of the load capacitance is to keep the output high in case of a suddenly input supply drop. In fact, the lower the output capacitance, the better since this will lead to a lower inrush current.

    2. Data sheet says output capacitor as optional. What is the significance of the same ?

    [AH]: Please refer to above

    3. What slew rate will be the switch working with no output capacitor connected ?

    [AH]: Output capacitance does not affect the slew rate of the device. It will affect the fall time since a larger capacitor will take a longer time to discharge. Please refer to our app note, Timing of Load Switches, for more information on factors that affect slew rate and turn-on time. 

    4. My load current is only 12-15 Micro amperes.

    [AH]: I don't see any issue with this functionality. If you're looking for a load switch with a lower quiescent/leakage current, and with similar features as the TPS22910A (always on reverse current blocking, quick output discharge), I recommend looking at the TPS22916 or the TPS22917.

    Thanks,

    Arthur Huang

    To find the latest information on Power Switches, visit www.ti.com/powerswitch