CMPWR150 datasheet(12/15 Pages) ONSEMI

12 / 15 page

CMPWR150

Rev. 3 | Page 12 of 15 | www.onsemi.com

Typical Thermal Characteristics

Thermal dissipation of junction heat consists primarily of two paths in series. The first path is the junction to

the case

(

JC) thermal resistance, which is defined by the package style, and the second path is the case to

ambient

(

CA) thermal resistance, which is dependent on board layout.

For a given package style and board layout, the operating junction temperature is a function of junction power

dissipation P

JUNC and the ambient temperature, resulting in the following thermal equation:

TJUNC = TAMB + PJUNC (θJC ) + PJUNC (θCA)

Measurements showing performance up to maximum junction temperature of 125°C were performed under

light load conditions (5mA). This allows the ambient temperature to be representative of the internal junction

temperature.

Out Vo lt V T. eps

Figure 12. Output Voltage vs. Temperature

Output Voltage vs. Temperature. Figure 13 shows the regulator V

OUT performance up to the maximum rated

junction temperature. The overall 100°C variation in junction temperature causes an output voltage change of

about 30mV, reflecting a voltage temperature coefficient of 90ppm/°C.

Output Voltage (500mA) vs. Temperature. Output Voltage (500mA) vs. Temperature shows the regulator steady

state performance when fully loaded (500mA) in an ambient temperature up to the rated maximum of 70°C.

The output variation at maximum load is approximately 25mV across the normal temperature range.

Out V R v T. eps

Figure 13. Output Voltage (500mA) vs. Temperature

Thresholds vs. Temperature. Figure 14 shows the regulator select/deselect threshold variation up to the

maximum rated junction temperature. The overall 100°C change in junction temperature causes a 30mV

variation in the select threshold voltage (regulator enable). The deselect threshold level varies about 50mV

over the 100°C change in junction temperature. This results in the built-in hysteresis having minimal variation

over the entire operating junction temperature range.

CMPWR150 датащи(PDF) 12 Page - ON Semiconductor