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Original question:

LP3985IM5X-2.5 How to eliminate a initial output spike when apply input voltage?

TPS65133: General Design Issues for the TPS65133

Will
Prodigy 250 points
Part Number: TPS65133
Other Parts Discussed in Thread: BUF602, , LM3671, CC2650, FDC2214

Dear TI experts,

Can the ±5V output of TPS65133 supply power to BUF602 a high speed unit gain buffer?

Sorry, this question might be too basic. According to the datasheet, ±5V is exactly what the BUF602 needs.

But I still want to confirm if this design is feasible.

Also, I have a question about powering the TPS65133.

Can I use the output of the DC-DC converter LM3671MF-3.3 (Vout 3.3V, Ioutmax 600mA) to power the TPS65133?

Or directly use a 3.7V lithium polymer battery for power supply, which is better in efficiency and power consumption?

One last question about AGND and PGND in the layout.

Can I simply use a single GND in the schematic and PCB layout?

Best regards,

Will

  • +1
    TI__Mastermind 18550 points

    Hello Will,

    Reviewing the datasheets of the two devices, TPS65133 should be able to power BUF602.

    VIN input supply range for TPS65133 and LM3671 is similar so you don't have to use LM3671 and feed up to 5V input to VIN of TPS65133 directly.

    You can also use the 3.7V battery directly to power the TPS65133 input.

    Yes, you can use a single GND plane in the schematics and layout.

    Kind Regards,

    Liaqat

  • 0 in reply to Liaqat Khan
    Prodigy 250 points

    Hello Liaqat,

    Thank you for your reply.

    Sorry, I'm new to electronics design. Can you give some advice on layout configuration?

    Because in addition to the subsystem composed of TPS65133 and BUF602, the remaining chips (such as FDC2214, 40MHz crystal oscillator, CC2650, etc.) are mainly powered by 3.3V. In addition, BUF602 needs to be placed about 1-3cm near FDC2214.

    So, is there any special restriction for this part of the ±5V traces to avoid parasitics and EMI?

    Best regards,

    Will