CS8101 データシートの表示（PDF） - Cherry semiconductor

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CS8101

Micropower 5V, 100mA Low Dropout Linear Regulator with RESET and ENABLE

Cherry semiconductor 

Application Notes: continued

In some cases, none of the packages will be sufficient to

dissipate the heat generated by the IC, and an external

heatsink will be required.

IIN

VIN

Smart

Regulator

}Control

Features

IQ

IOUT

VOUT

Figure 6: Single output regulator with key performance parameters

labeled.

Heatsinks

A heatsink effectively increases the surface area of the

package to improve the flow of heat away from the IC and

into the surrounding air.

Each material in the heat flow path between the IC and the

outside environment will have a thermal resistance. Like

series electrical resistances, these resistances are summed

to determine the value of RQJA:

RQJA = RQJC + RQCS + RQSA

(3)

where:

RQJC = the junctionÐtoÐcase thermal resistance,

RQCS = the caseÐtoÐheatsink thermal resistance, and

RQSA = the heatsinkÐtoÐambient thermal resistance.

RQJC appears in the package section of the data sheet. Like

RQJA, it too is a function of package type. RQCS and RQSA

are functions of the package type, heatsink and the inter-

face between them. These values appear in heatsink data

sheets of heatsink manufacturers.

6

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