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TPS65218D0: Replacing B1 version

Kuramochi Tadahiko
Guru 28715 points
Part Number: TPS65218D0
Other Parts Discussed in Thread: TPS65218,

Hi,

My customer is considering to replace the TPS65218 from "B1" version to "D1" version.

Can they replace directly?

In other words, is the schematic required to change?

Below workarounds are not implemented.

  1. 100-300pF capacitor, or
  2. Schottky diode, AND
  3. improved layout at the DCDC4 output cap (multiple vias & optimal component placement)

Best Regards,

Kuramochi

  • 0
    TI__Mastermind 30310 points
    TQ,

    If none of these workarounds have been implemented by your customer, then they can upgrade from TPS65218 (-B1) to TPS65218D0 without making any schematic changes. DCDC4 does not require any workarounds for -D0 silicon, only the recommended 47uF and 0.1uF capacitor in the datasheet.

    Obviously, "workaround" #3 in the list above is not a workaround at all, and you should always strive to improve layout, use many vias, and have optimal component placement.

    For the -D0 silicon, the tolerance for STRICT=1b have been improved. This means the window for Power-Good (VPG) and Overvoltage (VOV) is very narrow. This means any improvements you can make for layout & routing will prevent unexpected power-good faults that result in system resets. These faults are not issues with the device because they are very narrow by design and -D0 silicon improved the tolerance.

    Setting STRICT = 0b during initialization will also help prevent faults, if the system allows the wider tolerance.