• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 63 subscribers
  • Views 221 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.

TPS61032 unable to get 5v out

Anthony Pearce
Prodigy 10 points

Hello,

I have tried to use the TPS61032PWPRG4 and have been unable to get it to function either on a breadboard or PCB.  I am trying to implement a simple circuit to provide 5V, 1A from a Lithium Polymer battery.

My schematic is similar to Figure 19 "Power Supply Solution for Maxium Output Power" from the data sheet.  Conponent values are:

C1=10uF ceramic

C2=2.2uF ceramic

C3=220uF tantalum

R1, R2, R6 = OC (I am not using the UVLO)

L1 = 6.8uH

I have connected LBI to PGND, FB floating, LBO floating.  All other connections are per the schematic in Figure 19.

When I connect EN to VBAT I see about 1.75v on the output pins and the chip gets hot.  VBAT is at 4.15v (full battery).  I believe all connections are ok and have seen similar behaviour on breadboard and with some PCB's I have made.

Please assist, thanks.

  • 0
    TI__Guru**** 150930 points

    I would recommend ordering the EVM for this device and testing this known good circuit.

    Without waveforms, there is little we can do to debug this but your local FAE can help you better.

    The most likely explanation for what you're seeing is that your load is too high during startup.  There are many posts in the forum already about this and it is described in the datasheet.

  • 0
    Expert 2585 points

    HI,

    As I understand you have some boards which work Ok and some which are malfunctioned.

    Except load issues, it could be issues with ESD as these devices have limited built-in ESD protection.

    best regards,

    Oleksiy