Fairchild Semiconductor MC79L12A Datasheet

www.fairchildsemi.com

MC79LXXA/LM79LXXA

3-Terminal 0.1A Negative Voltage Regulator

Features	Description
• Output Current up to 100mA	These regulators employ internal current limiting and
• No External Components	thermal shutdown, making them essentially indestructible.
• Internal Thermal Over Load Protection
	TO-92
• Internal Short Circuit Current Limiting		SOT-89
• Output Voltage Offered in ± 5% Tolerance
• Output Voltage of -5V, -8V, -12V, -15V, -18V, -24V
	1	1
	1.GND 2.Input 3.Output
	8-SOP
	1
	1. Output 2.3.6.7. Input 5. GND 4.8. NC

Internal Block Diagram

GND

R26 R15

Q10

Q12

Q11

D3	D2
	R22
		Q5
	R23+R21			Q6			Q7
		R18							R	Output
								Q4	D1
		Q15	Q17
					C1				Q2Q3
								R1	R6
Q16 Q14		Q13		Q9	R16	R17	Q8	Q1	R3
								R2
R28	R24	R25	R29	R7				R27	R4	R5
										Input

Rev. 1.0.2

©2002 Fairchild Semiconductor Corporation

MC79LXXA/LM79LXXA

Absolute Maximum Ratings

Parameter	Symbol	Value	Unit
Input Voltage (for Vo = -5V to -8V)		-30
(for VO = -12V to -18V)	VI	-35	V
(for VO = -24V)		-40
Operating Temperature Range	TOPR	0 ~ +125	° C
Storage Temperature Range	TSTG	-65 ~ +150	° C

Electrical Characteristics(MC79L05A/LM79L05A)

(VI = -10V, IO = 40mA, CI = 0.33

F, CO = 0.1 F, 0° C ≤ TJ ≤

+125° C, unless otherwise specified)

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Output Voltage

VO

TJ = +25° C

-4.8

-5.0

-5.2

V

Line Regulation (Note1)

∆ VO

TJ =+25° C

-7.0V ≥

VI ≥ -20V

-

15

150

mV

-8V ≥

VI ≥ -20V

-

-

100

mV

Load Regulation (Note1)

∆ VO

TJ =+25° C

1.0mA ≤

IO ≤

100mA

-

20

60

mV

1.0mA ≤

IO ≤

40mA

-

10

30

mV

Output Voltage

VO

-7.0V ≥ VI ≥ -20V, 1.0mA ≤

IO ≤

40mA

-4.75

-

-5.25

V

VI = -10V, 1.0mA ≤

IO ≤

70mA

-4.75

-

-5.25

V

Quiescent Current

IQ

TJ =+25° C

-

2.0

5.5

mA

TJ = +125° C

-

-

6.0

Quiescent Current

With Line

∆ IQ

-8V ≥ VI ≥ -20V

-

-

1.5

mA

Change

With Load

∆ IQ

1.0mA ≤ IO ≤

40mA

-

-

0.1

mA

Output Noise Voltage

VN

TA = +25° C,10Hz ≤

f ≤

100kHz

-

30

-

V

Ripple Rejection

RR

f = 120Hz, -8V ≥ VI ≥ -18V

41

60

-

dB

TJ = +25° C

Dropout Voltage

VD

TJ = +25° C

-

1.7

-

V

Note:

1.Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used.

2

MC79LXXA/LM79LXXA

Electrical Characteristics (MC79L08A) (Continued)

(VI = -14V, IO = 40mA, CI = 0.33

F, CO = 0.1 F, 0° C ≤

TJ ≤

+125° C, unless otherwise specified)

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Output Voltage

VO

TJ = +25° C

-7.7

-8.0

-8.3

V

Line Regulation(Note1)

∆ VO

TJ = +25° C

-10.3V ≥

VI ≥

-23V

-

-

175

mV

-12V ≥ VI ≥ -23V

-

-

125

mV

Load Regulation (Note1)

∆ VO

TJ = +25° C

1.0mA ≤

Io ≤

100mA

-

-

80

mV

1.0mA ≤

Io ≤

40mA

-

-

40

mV

Output Voltage

VO

-10.3V ≥

VI ≥

-23V, 1.0mA ≤

Io ≤

40mA

-7.6

-

-8.4

V

VI = -14V, 1.0mA ≤ Io ≤ 70mA

-7.6

-

-8.4

Quiescent Current

Iq

Tj = +25° C

-

-

6.0

mA

Tj = +125° C

-

-

5.5

Quiescent Current

With Line

∆ IQ

-11.7V ≥

VI ≥

-23V

-

-

1.5

mA

Change

With Load

1.0mA ≤

Io ≤

40mA

-

-

0.1

mA

Output Noise Voltage

VN

Tj = +25° C,10Hz ≤

f ≤

100kHz

-

50

-

V

Ripple Rejection

RR

f = 120Hz, -11V ≥

VI ≥

-21V

39

55

-

dB

Tj = +25° C

Dropout Voltage

VD

Tj = +25° C

-

1.7

-

V

Note:

1.Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used.

3

MC79LXXA/LM79LXXA

Electrical Characteristics(MC79L12A) (Continued)

(VI = -19V, IO = 40mA, CI = 0.33

F, CO = 0.1 F, 0° C ≤ TJ ≤

+125° C, unless otherwise specified)

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Output Voltage

VO

TJ = +25° C

-11.5

-12.0

-12.5

V

Line Regulation (Note1)

∆ VO

TJ = +25° C

-14.5V ≥

VI ≥

-27V

-

-

250

mV

-16V ≥ VI ≥ -27V

-

-

200

mV

Load Regulation (Note1)

∆ VO

TJ = +25° C

1.0mA ≤

IO ≤

100mA

-

-

100

mV

1.0mA ≤

IO ≤

40mA

-

-

50

mV

Output Voltage

VO

-14.5V > VI >

-27V, 1.0mA ≤ IO ≤ 40mA

-11.4

-

-12.6

V

VI = -19V, 1.0mA ≤

IO ≤ 70mA

-11.4

-

-12.6

V

Quiescent Current

IQ

TJ = +25° C

-

-

6.0

mA

TJ = +125° C

-

-

6.5

Quiescent Current

With Line

∆ IQ

-16V ≥ VI ≥ -27V

-

-

1.5

mA

Change

With Load

∆ IQ

1.0mA ≤ IO ≤

40mA

-

-

0.1

mA

Output Noise Voltage

VN

TA = +25° C,10Hz ≤

f ≤

100kHz

-

80

-

V

Ripple Rejection

RR

f = 120Hz, -15V≥ VI ≥

-25V

37

42

-

dB

TJ = +25° C

Dropout Voltage

VD

TJ = +25° C

-

1.7

-

V

Note:

1.Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used.

4