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TPS62090-Q1: When input voltage change from 5V to 3.7V, what is the output voltage?

Amelie Zheng
Genius 10865 points
Part Number: TPS62090-Q1
Other Parts Discussed in Thread: TPS62090

Hi Team,

1. The datasheet shows that  FREQ has internal pull-down, so when I change to 2.8MHz, I only need to drop the pull-up resistor NC?

2. In customer‘s application, they change from 5V to 4V. However, when the input of TPS62090-Q1 change from the main supply 5V to the backup battery 3.7V, what is the output voltage of TPS62090? 0V?


 2. Our project uses TPS62090QRGTRQ1 5V to 4V when it works normally; When the front-end 5V voltage is switched to battery-powered, that is, the input voltage becomes 3.7V, the output voltage will be directly equal to 3.7V or another value.

  • 0
    TI__Genius 13460 points

    Hi Amelie,

    Yes, If you want to change the frequency to 2.8MHz then Freq pin can be left floating or connected to GND.

    From the schematic, it looks the output is set as 4V. If the input is dropping to 3.7V the converter would not regulate at 4V. It would give equal to supply or less output voltage. Could you check the current limit of the battery? The application has high current consumption the supply from battery might not support such high current consumption and causing the drop on the input voltage.