CS8183 datasheet(7/8 Pages) ONSEMI

Part #	CS8183

Description	Dual Micropower 200 mA Low Dropout Tracking Regulator/Line Driver

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CS8183

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IOUT1(max) is the maximum output current, for the

application,

IOUT2(max) is the maximum output current, for the

application,

IQ is the quiescent current the regulator consumes at

IOUT(max).

Once the value of PD(max) is known, the maximum

permissible value of RΘJA can be calculated:

R

QJA +

150

°C * TA

PD

(2)

The value of RΘJA can then be compared with those in the

package section of the data sheet. Those packages with

RΘJA’s less than the calculated value in equation 2 will keep

the die temperature below 150

°C.

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

dissipate the heat generated by the IC, and an external heat

sink will be required.

Figure 15. Dual Output Regulator with Key

Performance Parameters Labeled

IIN

IOUT

IQ

SMART

VOUT

VIN

REGULATOR

Control

Features

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 RΘJA:

R

QJA + RQJC ) RQCS ) RQSA

(3)

where:

RΘJC = the junction−to−case thermal resistance,

RΘCS = the case−to−heatsink thermal resistance, and

RΘSA = the heatsink−to−ambient thermal resistance.

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

RΘJA, it is a function of package type. RΘCS and RΘSA are

functions of the package type, heatsink and the interface

between them. These values appear in heat sink data sheets

of heat sink manufacturers.

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