TPSM82903: Efficiency comparison with the TPS62903

Hi Dice-K,

This is because the DCR of inductor is different.  Also, the variation of inductor is different.

Thanks,

COlin

Hi Colin,
Thank you for your reply.

Can you disclose the DCR of the inductor mounted on the TPSM82903?

The DCR of the inductor of the TPSM82903 is calculated as follows.
Is the calculation correct?

Inductor loss when the TPS62903 inductor is XGL4020-102 (DCR=8.2mΩ)
8.2mΩ × 3A^2 = 74mW

TPS62903 loss (including inductor)
(1.2V × 3A) ÷ 0.84 - (1.2V × 3A) = 686mW

TPSM82903 loss
(1.2V × 3A) ÷ 0.77 - (1.2V × 3A) = 1075mW

Loss difference between TPSM82903 and TPS62903 (including inductor)
1075mW - 686mW = 389mW

Inductor loss of TPSM82903
389mW + 74mW = 463mW

DCR of the inductor of TPSM82903
463mW ÷ 3A^2 = 51.4mΩ

Best regards,
Dice-K

Hi Colin,

The DCR is stated to be "approximately 40mΩ."

Does this mean that if I use an inductor of less than 40mΩ with the TPS62903, the TPS62903 will be more efficient?

Best regards,
Dice-K