TPS63070: Not Starting at VIN below 4V

Ayla Shiva

Intellectual 680 points

Part Number: TPS63070

Hi,

I have integrated the TPS63070 into my design, and the details are as follows

Vin= 3.5V(Li+ Battery)/Solar Power 3.5W/6V

Load= <200mA

Vout (Set):5.5V using Programmable resistors.

When i have fed the input voltage around 3.3V using the Li ion, to it, I cannot able to see the voltage at the output, after I started to Rise the Voltage to almost 4.0V then I can see the Output 5.5V at the Output terminals.

As per the specs from datasheet, it should be able to start feeding the output voltage at Input less than 2V,

what is the fix possibly that I have to do?

over 6 years ago

0 Milos over 6 years ago

TI__Expert 7925 points

Hi Ayla,

Minimum voltage needed to start-up the TPS63070 is 3 V. Once the device is operating, the input voltage can go down to 2 V.

The device should start up at 3.3 V. For proper start-up it is important that the impedance between the input power source and the VIN pin is as low as possible. Could you please show us:
- Scope plots during the start-up (Vin and Vout)
- Schematic

Best regards,
Milos

0 Brigitte over 6 years ago in reply to Milos

TI__Guru 65170 points

Hello Ayla,

As you did not answer, I expect that you could solve your issue. If not, please add another post below or start a new thread if this one is locked.

0 Ayla Shiva over 6 years ago in reply to Brigitte

Intellectual 680 points

Thanks Brigitte, for the reminder, I will do the test w ith +3v and will inform you at the earliest.

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TPS63070: Not Starting at VIN below 4V