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RT9167-16PS Datasheet(PDF) 11 Page - Richtek Technology Corporation |
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RT9167-16PS Datasheet(HTML) 11 Page - Richtek Technology Corporation |
11 / 13 page RT9167/A 11 DS9167/A-26 March 2007 www.richtek.com The value of junction to case thermal resistance θJC is popular for users. This thermal parameter is convenient for users to estimate the internal junction operated temperature of packages while IC operating. It’ s independent of PCB layout, the surroundings airflow effects and temperature difference between junction to ambient. The operated junction temperature can be calculated by following formula : TJ = TC + PD x θJC Where TC is the package case temperature measured by thermal sensor, PD is the power dissipation defined by user’ s function and the θJC is the junction to case thermal resistance provided by IC manufacturer. Therefore it’ s easy to estimate the junction temperature by any condition. For example, how to calculate the junction temperature of RT9167A-28CB SOT-23-5 package? If we use input voltage VIN = 3.3V at an output current I O = 500mA and the case temperature (pin 4 of SOT-23-5 package) TC = 70 °C measured by thermal couple while operating, then our power dissipation is as follows: PD = (3.3V − 2.8V) x 500mA + 3.3V x 90μA ≅ 250mW And the junction temperature TJ could be calculated as following : TJ = TC + PD x θJC TJ = 70 °C + 0.25W x 130°C/W = 70 °C + 32.5°C = 102.5 °C < TJ(MAX) =125°C For this operation application, TJ is lower than absolute maximum operation junction temperature 125 °C and it’s safe to use. |
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