• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 495 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.

TPS63031 - PS/SYNC pullup resistor

Atsushi Okui
Genius 4015 points
Other Parts Discussed in Thread: TPS63031

Hello, all

Now we are designing our new board with TPS63031 and MSP430.

On our system configuration, Vin is supplied from Li-Ion battery, and VINA and EN are connected to GND via capacitor.

We would like to connect PS/SYNC pin directly from GPIO pin on MSP430. This purpose is to reduce the system power consumption by the means of removing pull up resistor.

We assume that this case effect on PS/SYNC pin when starting up, since the input from MSP430 is Hi-Z on this timing.

We estimate that the maximum Iout on starting up is about 40mA, but need to be care for 1A inrush current.

Please let us clarify whether we could configure such above configuration for this device.

We thank you in advance for your information.

Best regards,

  • 0
    TI__Guru**** 150820 points

    Being a digital input pin, the PS/SYNC pin should not be left floating.  So, a pull-up or pulldown resistor accomplishes this.  We do this on the EVM: http://www.ti.com/lit/ug/slvu275/slvu275.pdf

    If the PS/SYNC pin will normally be driven high in your application, then a pull-up resistor wastes no current during the time when PS/SYNC is high.

    Also, the current through a 1 M pull-up or pulldown resistor is negligible compared to the operating current of the TPS63031, since you have the device always enabled.