BQ25890H: ILIM pin resistor value

HYEONTAEK KOH

Part Number: BQ25890H

Tool/software:

Hi Team,

we're using ILIM resistor 260 ohm to limit the input current 1.5A. it is just followed example of datasheet.

when I calculated with provided formula 9.2.12 since we enabled ILIM pin, charging current should be less than 1.5A but there were cases like 1.6, 1.7A.

why is there difference happened?

and for KILIM value what value should be used? in the table of 8.5, value is not fixed, typical one is 355 (A x Ω). but to see 1.5A limit, we should apply MAX value of it 390.

isn't it a normal way to apply the typical value of this? why we should apply max value to see the exact limit value?

Thank you in advance,

Hyeontaek

3 months ago

0 Ning T 3 months ago

TI__Guru 52061 points

Hi Hyeontaek,

The maximum KILIM should be used when setting the input current regulation.

Thanks,

Ning.

0 HYEONTAEK KOH 3 months ago in reply to Ning T

Prodigy 40 points

Hi Ning,

then how are typical and minimum values can be used? so is it correct to assuming KILIM value is fixed value as 390 or 385?

is there any other reason for having minimum and typical values on this?

Thanks,

Hyeontaek

0 Ning T 3 months ago in reply to HYEONTAEK KOH

TI__Guru 52061 points

Hi Hyeontaek,

The design should ensure that under the application normal operating conditions, the minimum input current regulation will not be triggered.

Thanks,

Ning.

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BQ25890H: ILIM pin resistor value