• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 1175 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.

TPS650250: Is there any PMIC that have 1 buck-boost DCDC, 2 buck and 2 LDO?

FrankXu
Genius 3500 points
Part Number: TPS650250
Other Parts Discussed in Thread: BQ25890, , TPS65218, TPS65010, LP3907, BQ24780S

In my system, these ICs are used:

bq25890   ---   battery charging IC

bq27441   ---   battery Gas Gauge

TPS650250   --- Power Management IC which provide 3.3V/1.8V/1.3V/3V LDO/1.2V LDO

The VCC_BATT of Li-Ion battery can vary from 2.75V to 4.2V.

When the battery supply power to the system through bq25890, the VCC_SYS = VCC_BATT.

So, when the VCC_BATT falls to below 3.3V, the TPS650250 can not provide 3.3V because it's a step-down DCDC.

Question: Does TI have any PMIC that can feed my needs? (1 buck-boost DCDC, 2 buck and 2 LDO)

Need 1 buck-boost DCDC, so that evern when the VCC_BATT falls to 2.75V, the PMIC can still provide 3.3V.

I looked through all the PMIC ICs, but didn't find any suitable chip.

 

Thank you.

Frank

  • 0
    TI__Genius 16410 points
    Hello Frank,

    We have one PMIC with a buck-boost, TPS65218. It has 5 bucks, 1 buck-boost, and 1 LDO. Based on your requirements, it may not exactly fit what you are looking for.

    Another option would be to use a separate buck-boost front-end regulator, and supply the PMIC from the 3.3V output of the buck-boost. Then you could use TPS650250 in this configuration, or if you only need 2 bucks, you could use something LP3907, LP8731, TPS65010, TPS65010, etc.

    A 3rd option would be to use a boost from 1.8V to 3.3V, so the outputs would still work from VCC=2.75V. Similar PMICs as above could support this configuration, though it would only work if 1.8V can come up before 3.3V.

    Regards,
    Karl
  • 0 in reply to Karl Wallinger
    Genius 3500 points

    Hi Karl Wallinger,

          Is there any charging IC like bq25890 but which can keeps VCC_SYS>3.3V?

    Frank

  • 0 in reply to FrankXu
    TI__Genius 16410 points
    Hi Frank,

    I couldn't find any device that fits your system conditions. I looked through the BQ portfolio and only found one device with buck-boost, BQ24780S. But it looks like the minimum recommended operating Vin voltage is 4.5V, so I'm not sure it will work for your application.

    Regards,
    Karl