MC7800, MC7800A, LM340, LM340A Series

15

MOTOROLA ANALOG IC DEVICE DATA

Figure 11. Worst Case Power Dissipation versus

Ambient Temperature (Case 221A)

Figure 12. Input Output Differential as a Function

of Junction Temperature (MC78XXC, AC)

20

16

12

8.0

4.0

0

–50

–25

0

25

50

75

100

125

150

TA, AMBIENT TEMPERATURE (°C)

θHS = 0°C/W

0.5

0

–75

–50

–25

0

25

50

75

100

125

TJ, JUNCTION TEMPERATURE (°C)

IO = 0 mA

IO = 20 mA

IO = 1.0 A

IO = 500 mA

IO = 200 mA

∆VO = 2% of VO

– – – Extended Curve for MC78XXB

θJC = 5°C/W

θJA = 65°C/W

TJ(max) = 150°C

θHS = 5°C/W

θHS = 15°C/W

No Heatsink

2.0

1.5

1.0

2.5

Figure 13. D2PAK Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

30

40

50

60

70

80

1.0

1.5

2.0

2.5

3.0

3.5

0

102030

25

15

5.0

L, LENGTH OF COPPER (mm)

PD(max) for TA = 50°C

Minimum

Size Pad

2.0 oz. Copper

L

L

Free Air

Mounted

Vertically

R

θJA

DEFINITIONS

Line Regulation – The change in output voltage for a

change in the input voltage. The measurement is made under

conditions of low dissipation or by using pulse techniques such

that the average chip temperature is not significantly affected.

Load Regulation – The change in output voltage for a

change in load current at constant chip temperature.

Maximum Power Dissipation – The maximum total

device dissipation for which the regulator will operate within

specifications.

Quiescent Current – That part of the input current that is

not delivered to the load.

Output Noise Voltage – The rms ac voltage at the output,

with constant load and no input ripple, measured over a

specified frequency range.

Long Term Stability – Output voltage stability under

accelerated life test conditions with the maximum rated

voltage listed in the devices’ electrical characteristics and

maximum power dissipation.

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding

the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and

specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola

data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”

must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of

others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other

applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury

or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola

and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees

arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that

Motorola was negligent regarding the design or manufacture of the part. Motorola and

are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal

Opportunity/Affirmative Action Employer.