MIC2128 datasheet(25/32 Pages) MICROCHIP

Teilenummer	MIC2128

Bauteilbeschribung	75V, Synchronous Buck Controller Featuring Adaptive On-Time Control with External Soft Start

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DS20005620A-page 25

MIC2128

EQUATION 5-33:

The maximum recommended operating junction

temperature for the MIC2128 is 125°C.

Using the output voltage of the same switching

regulator, when it is in between 4.6V (typ.) to 14V, as

the voltage at the EXTVDD pin, significantly reduces

the power dissipation inside the MIC2128. This

reduces the junction temperature rise as illustrated

below.

For the typical case of VVIN = 48V, VOUT = 5V, the

maximum ambient temperature = 85°C and 10 mA of

ISW.

The condition where EXTVDD is not used is shown in

Equation 5-34:

EQUATION 5-34:

When the 5V output is used as the input to the EXT-

VDD pin, the MIC2128 junction temperature reduces

from 113°C to 88°C as calculated in Equation 5-35:

EQUATION 5-35:





 T

Where:

= Junction temperature

PIC

= Power dissipation

θJA

= Junction Ambient Thermal resistance

(50.8

°C/W)

48V

10mA

1.5





0.552W

50.8

CW





 85

C

113

C

5V10mA

1.5mA





0.058W

50.8

CW





 85

C

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