DRA821U: Inductor DCR value

Kaushal C

Part Number: DRA821U

Dear Team,

The DRA821U's power rail (VDD_CORE, VDD_MCU and VDD_CPU) have minimum 0.76V and it recommends voltage should never fall below minimum value,

But in single PMIC user guide using TPS6594 PMIC, EVK uses inductor with 13mOhm DCR (TFM252012ALMAR22MTAA) which will make voltage drop below minimum value. Is it ok to use inductor with 13mOhm DCR?

over 1 year ago

0 Robert Eschler over 1 year ago

TI__Guru 51695 points

The DCR of the inductor is compensated by the SMPS of PMIC, as the sense location is after inductor. It also can compensate for and resistance inside the PCB when sensed at the load (recommended). The DCR of inductor only affects the efficiency of the SMPS. The inductor used by EVM was recommended by PMIC team and can be used if desired.

0 Kaushal C over 1 year ago in reply to Robert Eschler

Intellectual 440 points

Thankyou Robert,

It seems that I can use inductor with 13mOhm DCR for my circuit.

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DRA821U: Inductor DCR value