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LP87561-Q1: Load current measures/sharing

Jk
Prodigy 120 points
Part Number: LP87561-Q1

I'm operating the PMIC in 4-Phase configuration(single output). The measurements via the I2C registers is listed below. As indicated, most of the current is from BUCK0(2.78A). I was expecting the 4 bucks to share the current load equally.

Should the current be equally shared?

Power State:

========================================

Input: 12.1V

----------------------------------------

PMIC 1 (LP875610) - Connected

[ OK ] Clock

[ OK ] Temperature

[ OK ] Overvoltage

[ OK ] 0: 0.850V, 2.780A

[ OK ] 1: 0.850V, 0.740A

[ OK ] 2: 0.850V, 0.760A

[ OK ] 3: 0.850V, 0.660A

  • 0
    TI__Expert 7060 points

    Hi Jeff,

    Yes, load is shared equally but as described in datasheet section 8.3.1.5. master BUCK0 will show all BUCK's current summed up. So BUCK0 presents total output current.

    BUCK0 current 2.78 A / 4 = 0.695 A which is average between all the BUCK's.