• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 348 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS61022: output capacitor selection

liping pan
Intellectual 690 points

Part Number: TPS61022

May application:

input voltage: 2.7V~4.2v

output voltage: 4.5V

output current: max 3.8A

From WEBENCH design, it requires 2*47uF capacitor.

From my calculation of datasheet formula or calculation tool excel from TI, it requires only one 47uF capaictor.

Please let me know any problem to use one 47 uF cap.

  • +1
    TI__Genius 13505 points

    Hi Liping,

    I think what you needs is 33uF effective capacitance, not nominal capacitance. For ceramic capacitors, the effective capacitance is usual smaller when there is a dc bias voltage. So one 47uF cap, the effective value is usual not as large as 47uF.

    Here is an example of capacitance vs. DC bias.

     

    Regards,

    Nathan