CS5210-1GT3 View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

CS5210-1GT3

10 A LDO 3−Pin Adjustable Linear Regulator

ON Semiconductor 

CS5210−1

The maximum ambient temperature and the power

dissipation are determined by the design while the

maximum junction temperature and the thermal resistance

depend on the manufacturer and the package type. The

maximum power dissipation for a regulator is:

PD(max) + (VIN(max) * VOUT(min))IOUT(max) ) VIN(max) IIN(max)

A heat sink 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 has a thermal

resistance. Like series electrical resistances, these

resistances are summed to determine the total thermal

resistance between the die junction and the surrounding air,

RΘJC. This total thermal resistance is comprised of three

components. These resistive terms are measured from

junction to case (RΘJC), case to heat sink (RΘCS), and heat

sink to ambient air (RΘSA). The equation is:

RQJA + RQJC ) RQCS ) RQSA

RΘJC is rated @ 1.4°C/W for the CS5210−1. For a high

current regulator such as the CS5210−1 the majority of heat

is generated in the power transistor section. The value for

RΘSA depends on the heat sink type, while the RΘCS depends

on factors such as package type, heat sink interface (is an

insulator and thermal grease used?), and the contact area

between the heat sink and the package. Once these

calculations are complete, the maximum permissible value

of RΘJA can be calculated and the proper heat sink selected.

For further discussion on heat sink selection, see application

note “Thermal Management,” document number

AND8036/D, available through the Literature Distribution

Center or via our website at http://onsemi.com.

http://onsemi.com

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