MIC4425 datasheet(14/26 Pages) MICROCHIP

14 / 26 page

MIC4423/4/5

DS20006638A-page 14



2022 Microchip Technology Inc. and its subsidiaries

EXAMPLE 1: The MIC4423 operating on a 12V supply

driving two capacitive loads of 3000 pF each, operating

at 250 kHz, with a duty cycle of 50%, in a maximum

ambient of 60°C.

First, calculate load power loss:

Then, transition power loss:

Then quiescent power loss:

Total power dissipation, then, is:

Assuming an SOIC package, with JA of 120°C/W, this

will result in the junction running at 29.4°C above

ambient.

Given a maximum ambient temperature of 60°C, this

will result in a maximum junction temperature of

89.4°C.

EXAMPLE 2: A MIC4424 operating on a 15V input,

with one driver driving a 50Ω resistive load at 1 MHz,

with a duty cycle of 67%, and the other driver

quiescent, in a maximum ambient temperature of 40°C:

First, IO must be determined.

EQUATION 4-10:

Given RO from the characteristic curves then:

and:

because only one side is operating,

and

this assumes that the unused side of the driver has its

input grounded, which is more efﬁcient = 0.015W.

Then,

In a ceramic package with an JA of 100°C/W, this

amount of power results in a junction temperature

given the maximum 40°C ambient of:

PL f C VS

 2



PL 250 000



3 109 3 109







122 0.2160W



PT f VS A s









250 000



12 2.2 10 6.6mW



PQ VS D IH 1 D

–











0.5 0.0035







0.5 0.0003













0.0228W

PD 0.2160 0.0066 0.0228 0.2454W

0.2454 120 29.4C



PL I

2 R



IO VS RO RLOAD







IO 15 3.3 50







IO 0.281A

0.281



2

3.3 0.67 0.174W



PT F VS A s











1 000 000



15 3.3 10 9

–







2 0.025W



PQ 15

0.67 0.00125







0.33 0.000125







1 0.000125













PD 0.174 0.025 0.0150 0.213W

0.213 100







40 61.4C

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