MIC45116

DS20005571B-page 22



2016 - 2022 Microchip Technology Inc.

EQUATION 4-3:

The peak-to-peak inductor current ripple is:

EQUATION 4-4:

The MIC45116 has a 1.0 µH inductor integrated into

the module. In case of a hard short, the short limit is

folded down to allow an indefinite hard short on the

output without any destructive effect.

It is mandatory to make sure that the inductor current

used to charge the output capacitance during soft-start

is under the folded short limit; otherwise the supply will

go in hiccup mode and may not finish the soft-start

successfully.

With R26 = 1.62 kΩ and C16 = 15 pF, the typical output

current limit is 8A.

R26







+

0.5



0.1

–















+

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

=

Where:

Desired current limit.

On-resistance of low-side power

MOSFET, 16 mΩ typically.

Current-limit threshold offset (typical

value is 14 mV).

Current-limit source current (typical

value is 80 µA).

Inductor current peak-to-peak,

since the inductor is integrated, use

Equation 4-4 to calculate the

inductor ripple current.











–













L



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

=