MP8736– HIGHEFFICIENCY,FAST TRANSIENT,6A, 19V SYNCHRONOUSBUCKCONVERTERIN ATINY3X4mmPACKAGE

MP8736 Rev. 1.34

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19

4/18/2012

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result in lower output ripple voltage. However, a

larger value inductor will have a larger physical

size, higher series resistance, and/or lower

saturation current. A good rule for determining

the inductor value is to allow the peak-to-peak

ripple current in the inductor to be approximately

30~40% of the maximum switch current limit.

Also, make sure that the peak inductor current is

below the maximum switch current limit. The

inductance value can be calculated as:

OUT

OUT

SW

L

IN

VV

L(1

)

FI

V

=× −

×Δ

(25)

current.

Choose an inductor that will not saturate under

the maximum inductor peak current. The peak

inductor current can be calculated as:

OUT

OUT

LP

OUT

SW

IN

VV

II

(1

)

2F

L

V

=+

× −

×

(26)

The inductors listed in Table 1 are highly

recommended for the high efficiency they can

provide.