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TPS1HB08-Q1: Is it correct recommendation about the order of "CVBB1-Device GND" and "CVBB2-Module GND" connection against VBB pin in figure 43?

Yoshiki Ochi
Genius 9455 points
Part Number: TPS1HB08-Q1

Hi team, 

Is it correct recommendation about the order of "CVBB1-Device GND" and "CVBB2-Module GND" connection against VBB pin in figure 43?

Figure 43 says that "there is two capacitors such as CVBB1 and CVBB2" and CVBB2, which is connected to module GND, is closer to VBB pin than CVBB1, which is connected to device GND.

Do you recommend to connect CVBB2 being closer to VBB pin than CVBB1? 
Or, Is it OK for connecting CVBB1 adjacent to VBB pin and being CVBB2 next to CVBB1? 

Regards,
Ochi

  • 0
    TI__Mastermind 34935 points

    Ochi-san,

    The schematic is for reference and does not correlate in position placement in the actual layout.

    For the two capacitors in question:

    • The 4.7nF CVBB1 is a bypass capacitor that should be placed as close as possible to the VBB pin. This will help the device perform against transients such as ISO7637 pulses
    • The 200nF CVBB2 capacitor is used for stabilizing the supply and making sure that the TPS1HB08-Q1 doesn't see any dips in the supply line or is exposed to any low frequency noise from the supply

    It is more critical to have CVBB1 closer to the VBB pin thant CVBB2.

  • 0 in reply to Timothy Logan
    TI__Genius 9455 points

    Hi Logan, 

    Thank you.

    I understood the schematic is just for reference and CVBB1 must closer to the VBB than CVBB2.

    Regards,
    Ochi