NCV8512(2008) データシートの表示（PDF） - ON Semiconductor

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NCV8512
(Rev.:2008)

5.0 V Micropower 150 mA LDO Linear Regulator with DELAY, Adjustable RESET, and Monitor FLAG

ON Semiconductor 

NCV8512

CALCULATING POWER DISSIPATION IN A

SINGLE OUTPUT LINEAR REGULATOR

The maximum power dissipation for a single output

regulator (Figure 16) is:

PD(max) + [VIN(max) * VOUT(min)] IOUT(max)

(1)

) VIN(max)IQ

where:

VIN(max) is the maximum input voltage,

VOUT(min) is the minimum output voltage,

IOUT(max) is the maximum output current for the

application, and

IQ is the quiescent current the regulator consumes at

IOUT(max).

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

permissible value of RqJA can be calculated:

RqJA

+

150C *

PD

TA

(2)

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

package section of the data sheet. Those packages with

RqJA’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

heatsink will be required.

IIN

VIN

SMART

REGULATOR®

} Control

Features

IQ

IOUT

VOUT

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 junction−to−case thermal resistance,

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

RqSA = the heatsink−to−ambient 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 interface

between them. These values appear in heatsink data sheets

of heat sink manufacturers.

Further mounting and cooling information is available in

the application note, AN1040/D, “Mounting Considerations

for Power Semiconductors” located in the

ON Semiconductor web site.

Figure 16. Single Output Regulator with Key

Performance Parameters Labeled

ORDERING INFORMATION

Device

Output Voltage

Package

Shipping†

NCV8512PW50G

NCV8512PW50R2G

5.0 V

SOW−16 E Pad

(Pb−Free)

47 Units / Rail

1000 / Tape & Reel

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

SMART REGULATOR is a registered trademark of Semiconductor Components Industries, LLC.

http://onsemi.com

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