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TPS61027: Is pin FB exposed in fixed version?

Pablo Liberman
Prodigy 130 points
Part Number: TPS61027
Other Parts Discussed in Thread: TPS61253A

Hi, 

I would like to know if pin 3 (FB) is connected to the internal resistor divider in the 5V fixed version TPS61027.
The functional block diagram in page 9 of datasheet only shows the adjustable version.

If not connected to the internal resistor divider, could be connected to GND or VOUT?

I am designing an intrinsically safe sensor so I need to be sure that the IC never exceeds 5V.

Thanks!

  • 0
    TI__Mastermind 46905 points

    Hi Pablo,

    the FB should be floating in fixed version device. and the internal feedback resistor set the output to 5V.

    what is the input/output in your application? the TPS61027 is quite old device, maybe there is better solution.

  • 0 in reply to Jasper Li
    Prodigy 130 points

    Hi Jasper,

    Thank you for your promt response.

    Jasper Li said:

    the FB should be floating in fixed version device. and the internal feedback resistor set the output to 5V.

    Yes, but my question is if the internal feedback resistors is connected to FB pin internally, so if there is a shortcircuit between FB and GND the output voltage will increase. If the FB is unconnected internally, I'll be sure there isn't any failure that could increase the output voltage.

    Jasper Li said:

    what is the input/output in your application? the TPS61027 is quite old device, maybe there is better solution.

    The requirements are:

    Voltage Input: 2.3 to 3.7V
    Voltage Output: 5V
    Load current: 5mA
    Fixed frequency (>1Mhz), Low noise PWM mode (no pulse-skip mode or power save mode), anti-ringing, fixed output, low quiescent current.

    I searched in boost converter section of TI website but I couldn't find another converter.

    Please let me know if you need further information.

    Best regards,
    Pablo

  • 0 in reply to Pablo Liberman
    TI__Mastermind 46905 points

    Pablo,

    i need times to check the connection of the FB pin. however, this device is not 1MHz. what about the TPS61253A with 3.8MHz if the BGA package is acceptable. anti-ring is not used in force PWM condition.

  • 0 in reply to Jasper Li
    Prodigy 130 points

    Hi Jasper,

    Thank you for your advice. I think TPS61253A is a good choice for my project.

    Best regards,
    Pablo