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TPS61175: TPS61175 working at 3.3V input and 29Vout 50mA

Kevin Wen
Intellectual 2235 points
Part Number: TPS61175

Hi team,

My customer have used TPS61175 in their system with 5V input and 29Vout 50mA, this project have mass production for some time, now there is a system change that input voltage is changed to 3.3V.

would you please suggest if TPS61175 can work at 3.3V input and 29Vout 50mA? As the duty cycle is near the maximum duty cycle 89% of TPS61175 @1.2MHz switching frequency, so my idea is lower the switching frequency and change to a 22uH inductor.

Will this work? would you please help to review customer's schematic and show your suggestion? thanks.

  • 0
    TI__Mastermind 40080 points

    3.3V input can support 29Vout 50mA.

    But be sure the Vin should be never lower than 3V. For the frequency setting, they can choose fs=750kHz to lower the switching loss, that is : R8 can be around 130k, but 10uH inductance is still OK when fs=750k. SoThey can still choose 10uH indcutor in their design.


    Could you please share the detailed application information for us?Like in what kind of end equipment? Volume? helen-chen@ti.com