MIC45116 datasheet(26/42 Pages) MICROCHIP

26 / 42 page

MIC45116

DS20005571A-page 26

 2016 Microchip Technology Inc.

Wherever possible, an infrared thermometer is

recommended. The measurement spot size of most

infrared thermometers is too large for an accurate

reading on a small form factor ICs. However, an IR

thermometer from Optris has a 1 mm spot size, which

makes it a good choice for measuring the hottest point

on the case. An optional stand makes it easy to hold the

beam on the IC for long periods of time.

The safe operating area (SOA) of the MIC45116 is

shown in Figure 10 and Figure 11. These thermal

measurements were taken on MIC45116 evaluation

board with no air flow. Since the MIC45116 is an entire

system comprised of switching regulator controller,

MOSFETs, and inductor, the part needs to be

considered as a system. The SOA curves will give

guidance to reasonable use of the MIC45116.

SOA curves should only be used as a point of

reference. SOA data was acquired using the MIC45116

evaluation board. Thermal performance depends on

the PCB layout, board size, copper thickness, number

of thermal vias, and actual airflow.

FIGURE 5-5:

MIC45116 Power Derating

vs. Output Voltage with 12V Input with No

Airflow.

FIGURE 5-6:

MIC45116 Power Derating

vs. Input Voltage with 1.0V Output with No

Airflow.

AMBIENT TEMPERATURE (°C)

1.0V OUTPUT

3.3V OUTPUT

5.0V OUTPUT

100 105

110

115

120 125

AMBIENT TEMPERATURE (°C)

5V OUTPUT

12V OUTPUT

100 105

110

115

120 125

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