TPS51200: TPS51200QDRCRQ1

Hi THANUJASHREE, 

Can you share the file some other way? This link requires a Microsoft account login.

If you aren't planning to use the VO output, you can leave the pin floating and keep the EN pin low. If you plan to pull the EN pin high I would recommend at least 10uF on the VO output to keep the regulation operating normally.

Regards,

James

If you are leaving the EN pin low, you can float VOSNS as well, since the VO output will not be regulating anyway.

If EN pin will be high, connect VOSNS directly to VO output with a short trace.

Regards,

James

Hi THANUJASHREE,

You will need to connect VIN for REFOUT to be available. VLDOIN doesn't appear to be necessary for REFOUT. Make sure the PGND (Thermal Pad) and GND pins are properly connected to GND reference.

Regards,

James

Hi THANUJASHREE,

• VIN only needs 4.7uF so you can reduce the capacitance on this pin (C388)
• For REFIN, I recommend increasing the resistor values for the divider just to further reduce current draw from the 1.2V source. 10k for the bottom resistor (R241) should be fine with the correct ratio value for the top resistor (R238)

Regards,

James

Hi THANUJASHREE,

You can still achieve 0.84V REFOUT voltage with higher resistance values. For example you could use R241 = 10k and R238 = ~4.286k. This would give you the proper ratio for 0.84V.

0.84V = 1.2V x [10k / (10k+ 4.286k)]

Also, make sure you are using at least 1% tolerance resistors.

I don't think there's an issue for the TPS51200 if you use lower resistor values but for your 1.2V source, lower current draw through the resistor divider to GND would be preferable.

Regards,

James