TPS68470: Termination requirement for TPS68470 buck pins

Mallari Hanchate

Prodigy 20 points

Part Number: TPS68470

I am using TPS68470 in one of our design, i am not using Buck from this PMIC.

Any termination guidelines if Buck is not used. Specifically these G7 and H6 pins.

over 4 years ago

0 Gerard Copeland over 4 years ago

TI__Genius 10380 points

Hi,

Please ensure that Bit 0 (ENABLE field) of register 0x48 (VDCTL) is always set to 0 to disable the core buck regulator. This bit's default value on reset is 0.

When the buck is disabled:

H6 (CORE_FB) can be left floating or connected to ground
G7 (CORE_SW) should be left floating
H7 (CORE_GND) should still connect to ground

Thanks,

Gerard

0 Mallari Hanchate over 4 years ago in reply to Gerard Copeland

Prodigy 20 points

Hi Gerard,

Will there be any issue if Bit0 of register 0x48 is not set to 0? We are reusing FW between the design and hence the question.

Thanks

Mallari

0 Gerard Copeland over 4 years ago in reply to Mallari Hanchate

TI__Genius 10380 points

Hi Mallari,

This bit disables the output of core buck regulator and powers down the internal control circuitry for this regulator. If this bit is not set to 0, the buck control circuit will turn on and attempt to regulate even if the converter is not connected or used in the application, resulting in unnecessary current consumption.

Thanks,

Gerard

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TPS68470: Termination requirement for TPS68470 buck pins