MC78LXXA (LM78LXX, KA78LXXA)

FIXED VOLTAGE REGULATOR (POSITIVE)

LM78L18 ELECTRICAL CHARACTERISTICS

°C ≤ T

J

≤ 125 °C, C

µF, C

µF, unless otherwise specified. (Note 1)

LM78L24 ELECTRICAL CHARACTERISTICS

°C ≤ T

J

≤ 125 °C, C

µF, C

µF, unless otherwise specified. (Note 1)

Notes

1. The maximum steady state usable output current and input voltage are very dependent on the heat sinking and/or lead

length of the package. The data above represent pulse test conditions with junction temperature as indicated at the initiation

of tests.

2. Power dissipation

≤ 0.75W.

Characteristic

Symbol

Test Conditions

Min

Typ

Max

Unit

Output Voltage

°C

17.3

18

18.7

V

21V

≤ V

I

≤ 33V

145

300

mV

22V

≤ V

I

≤ 33V

135

250

mV

1mA

≤ I

O

≤100mA

30

170

mV

1mA

≤ I

O

≤ 40mA

15

85

mV

21V

≤ V

I

≤ 33V

1mA

≤ I

O

≤ 40mA

17.1

18.9

V

Output Voltage

21V

≤ V

I

≤ V

MAX

(Note 2)

1mA

≤ I

O

≤ 70mA

17.1

18.9

V

Quiescent Current

°C

2.2

6.0

mA

Quiescent Current

with line

∆I

Q

21V

≤ V

I

≤ 33V

1.5

mA

Change

with load

∆I

Q

1mA

≤ I

O

≤ 40mA

0.1

mA

Output Noise Voltage

°C, 10Hz ≤ f ≤ 100KHz

150

µV/V

O

-1.8

mV/

°C

Ripple Rejection

RR

f = 120Hz, 23V

≤ V

I

≤ 33V, T

°C

34

48

dB

Dropout Voltage

°C

1.7

V

Characteristic

Symbol

Test Conditions

Min

Typ

Max

Unit

Output Voltage

°C

23

24

25

V

27V

≤ V

I

≤ 38V

160

300

mV

28V

≤ V

I

≤ 38V

150

250

mV

1mA

≤ I

O

≤ 100mA

40

200

mV

1mA

≤ I

O

≤ 40mA

20

100

mV

27V

≤ V

I

≤ 38V

1mA

≤ I

O

≤ 40mA

22.8

25.2

V

Output Voltage

27V

≤ V

I

≤ V

MAX

(Note 2)

1mA

≤ I

O

≤ 70mA

22.8

25.2

V

Quiescent Current

°C

2.2

6.0

mA

Quiescent Current

with line

∆I

Q

28V

≤ V

I

≤ 38V

1.5

mA

Change

with load

∆I

Q

1mA

≤ I

O

≤ 40mA

0.1

mA

Output Noise Voltage

°C, 10Hz ≤ f ≤ 100KHz

200

µV/V

O

-2.0

mV/

°C

Ripple Rejection

RR

f = 120Hz, 28V

≤ V

I

≤ 38V, T

°C

34

45

dB

Dropout Voltage

°C

1.7

V

Line Regulation

Line Regulation

∆V

O

∆V

O

°C

°C

°C

°C

∆V

O

∆V

O

Load Regulation

Load Regulation

∆V

∆T

∆V

∆T

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