Datasheet LM7918, LM7915, LM7906, LM7912, LM7908 Datasheet (CONTEK)

LM79XX LINEAR INTEGRATED CIRCUIT

3 TERMINAL 1A NEGATIVE
VOLTAGE REGULATOR

DESCRIPTION

The Contek
regulators are available in TO-220 package and with several
fixed output voltage, making them useful in a wide range of
application. Each type employs internal current limiting,
thermal shut-down and safe area protection, making it
essentially indestructible.

LM79XX series of three-terminal negative

FEATURES

*Output current up to 1A
*-5V;-6V;-8V;-12V;-15V;-18V;-24V output voltage available
*Thermal overload protection
*Short circuit protection

BLOCK DIAGRAM

GND

Voltage

reference

1

1:GND 2:Input 3:Output

R1

OUTPUT

R2

TO-220

CONTEK

Protection

circuitry

RSC

Contek

Contek Microelectronics Co.,Ltd.

http://www.contek-ic.com E-mail:[e-mail]

INPUT

1

LM79XX LINEAR INTEGRATED CIRCUIT

ABSOLUTE MAXIMUM RATINGS(Ta=25 C)

PARAMETER SYMBOL VALUE UNIT

Input voltage Vi -35 V
Thermal resistance
junction-air
Thermal resistance

junction-cases
Operating Temperature Topr 0 ~ +125 C
Storage Temperature Tstg -65 ~ +150 C

Contek7905 ELECTRICAL CHARACTERISTICS

(Refer to test circuits, 0<Tj<125 C,Io=500mA,Vi=-10V,Ci=33uF,Co=1uF, unless otherwise specified)

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

Output voltage Vo 5.0mA<Io<1.0A,Po<15W

Line regulation

Load regulation

Quiescent current IQ
Quiescent current change

Output voltage drift
Output noise voltage VN
Ripple rejection RR f=120Hz, Vi=-8V to -18V 54 60 dB
Dropout voltage Vo
Short circuit current Isc
peak current Ipk

R q JA 65 C /W

R q JC 5C/W

Tj=25 C

Vi=-7V to -20V -4.75 -5.00 -5.25 V

DVo Tj=25 C,Vi=-7V to -25V

Tj=25 C,Vi=-8V to -12V

DVo Tj=25 C,Io=5.0mA to 1.5A

Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A 0.05 0.5 mA

Q

DI

Vi=-7V to -25V 0.1 1.3 mA

DVo/ DT

Io=5mA -0.4
f=10hz to 100kHz,Ta=25 C

Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C

-4.8 -5.0 -5.2 V

10 100 mV

mV

10 100 mV

350mV
36mA

mV/ C

100

2V

300 mA

2.2 A

mV

Contek7906 ELECTRICAL CHARACTERISTICS

(Refer to test circuits, 0<Tj<125 C,Io=500mA,Vi=-11V,Ci=2.2uF,Co=1uF,unless otherwise specified)

Output voltage Vo 5.0mA<Io<1.0A,Po<15W

Line regulation

Load regulation

Quiescent current IQ
Quiescent current change

Output voltage drift
Output noise voltage VN
Ripple rejection RR f=120Hz, Vi=-9V to -19V 54 60 dB
Dropout voltage Vo
Short circuit current Isc
peak current Ipk

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

Tj=25 C

Vi=-8V to -21V -5.7 -6.0 -6.3 V

DVo Tj=25 C,Vi=-8V to -25V

Tj=25 C,Vi=-9V to -13V

DVo Tj=25 C,Io=5.0mA to 1.5A

Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A 0.5 mA

Q

DI

Vi=-8V to -25V 1.3 mA

DVo/ DT

Io=5mA -0.5
f=10hz to 100kHz,Ta=25 C

Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C

-5.75 -6.00 6-.25 V

10 120 mV

560mV

10 120 mV

360mV
36mA

mV/ C

130

2V

300 mA

2.2 A

Contek Microelectronics Co.,Ltd.

CONTEK

http://www.contek-ic.com E-mail:[e-mail]

mV

2

LM79XX LINEAR INTEGRATED CIRCUIT

Contek7908 ELECTRICAL CHARACTERISTICS

(Refer to test circuits, 0<Tj<125 C,Io=500mA,Vi=-14V,Ci=2.2uF,Co=1uF,unless otherwise specified)

Output voltage Vo 5.0mA<Io<1.0A,Po<15W

Line regulation

Load regulation

Quiescent current IQ
Quiescent current change

Output voltage drift
Output noise voltage VN
Ripple rejection RR f=120Hz, Vi=-11.5V to -21.5V 54 60 dB
Dropout voltage Vo
Short citcuit current Isc
peak current Ipk

Contek7912 ELECTRICAL CHARACTERISTICS

(Refer to test circuits, 0<Tj<125 C,Io=500mA,Vi=-18V,Ci=2.2uF,Co=1uF,unless otherwise specified)

Output voltage Vo 5.0mA<Io<1.0A,Po<15W

Line regulation

Load regulation

Quiescent current IQ
Quiescent current change

Output voltage drift
Output noise voltage VN
Ripple rejection RR f=120Hz, Vi=-15V to -25V 54 60 dB
Dropout voltage Vo
Short circuit current Isc
peak current Ipk

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

Tj=25 C

Vi=-10.5V to -23V -7.6 -8.0 -8.4 V

DVo Tj=25 C,Vi=-10.5V to -25V

Tj=25 C,Vi=-11.5V to -17V

DVo Tj=25 C,Io=5.0mA to 1.5A

Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A 0.05 0.5 mA

DI

Q

Vi=-11.5V to -25V 0.1 1.0 mA

DVo/ DT

Io=5mA -0.6
f=10hz to 100kHz,Ta=25 C

Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C

-7.7 -8.0 -8.3 V

10 100 mV

580mV

12 160 mV

480mV
36mA

mV/ C

175

2V

300 mA

2.2 A

mV

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

Tj=25 C

Vi=-14.5V to -27V -11.4 -12 -12.6 V

DVo Tj=25 C,Vi=-14.5V to -30V

Tj=25 C,Vi=-16V to -22V

DVo Tj=25 C,Io=5.0mA to 1.5A

Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A 0.05 0.5 mA

Q

DI

Vi=-14.5V to -30V 0.1 1.0 mA

DVo/ DT

Io=5mA -0.8
f=10hz to 100kHz,Ta=25 C

Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C

-11.5 -12.0 -12.5 V

12 240 mV

6 120 mV

12 240 mV

4 120 mV
36mA

mV/ C

200

2V

300 mA

2.2 A

mV

CONTEK

Contek Microelectronics Co.,Ltd.

http://www.contek-ic.com E-mail:[e-mail]

3

LM79XX LINEAR INTEGRATED CIRCUIT

Contek7915 ELECTRICAL CHARACTERISTICS

(Refer to test circuits, 0<Tj<125 C, Io=500mA,Vi=-23V,Ci=2.2uF,Co=1uF,unless otherwise specified)

Output voltage Vo 5.0mA<Io<1.0A,Po<15W

Line regulation

Load regulation

Quiescent current IQ
Quiescent current change

Output voltage drift
Output noise voltage VN
Ripple rejection RR f=120Hz, Vi=-18.5V to -28.5V 54 60 dB
Dropout voltage Vo
Short circuit current Isc
peak current Ipk

Contek7918 ELECTRICAL CHARACTERISTICS

(Refer to test circuits, 0<Tj<125 C,Io=500mA,Vi=-27V,Ci=2.2uF,Co=1uF,unless otherwise specified)

Output voltage Vo 5.0mA<Io<1.0A,Po<15W

Line regulation

Load regulation

Quiescent current IQ
Quiescent current change

Output voltage drift
Output noise voltage VN
Ripple rejection RR f=120Hz, Vi=-22V to -32V 54 60 dB
Dropout voltage Vo
Short circuit current Isc
peak current Ipk

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

Tj=25 C

Vi=-17.5V to -30V -14.25 -15 -15.75 V

DVo Tj=25 C,Vi=-17.5V to -30V

Tj=25 C,Vi=-20V to -26V

DVo Tj=25 C,Io=5.0mA to 1.5A

Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A 0.05 0.5 mA

DI

Q

Vi=-17.5V to -30.5V 0.1 1.0 mA

DVo/ DT

Io=5mA -0.9
f=10hz to 100kHz,Ta=25 C

Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C

-14.4 -15.0 -15.6 V

12 300 mV

6 150 mV

12 300 mV

4 150 mV
36mA

mV/ C

250

2V

300 mA

2.2 A

mV

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

Tj=25 C

Vi=-21V to -33V -17.1 -18 -18.9 V

DVo Tj=25 C,Vi=-21V to -33V

Tj=25 C,Vi=-24V to -30V

DVo Tj=25 C,Io=5.0mA to 1.5A

Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A 0.5 mA

Q

DI

Vi=-21V to -32V 1.0 mA

DVo/ DT

Io=5mA -1
f=10hz to 100kHz,Ta=25 C

Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C

-17.3 -18.0 -18.7 V

15 360 mV

8 180 mV

15 360 mV

5.0 180 mV
36mA

mV/ C

300

2V

300 mA

2.2 A

mV

CONTEK

Contek Microelectronics Co.,Ltd.

http://www.contek-ic.com E-mail:[e-mail]

4

LM79XX LINEAR INTEGRATED CIRCUIT

Contek7924 ELECTRICAL CHARACTERISTICS

(Refer to test circuits, 0<Tj<125 C,Io=500mA,Vi=-33V,Ci=2.2uF,Co=1uF,unless otherwise specified)

Output voltage Vo 5.0mA<Io<1.0A,Po<15W

Line regulation

Load regulation

Quiescent current IQ
Quiescent current change

Output voltage drift
Output noise voltage VN
Ripple rejection RR f=120Hz, Vi=-28V to -38V 54 60 dB
Dropout voltage Vo
Short circuit current Isc
peak current Ipk

APPLICATION CIRCUITS

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

DVo/ DT

Tj=25 C

Vi=-27V to -38V -22.8 -24 -25.2 V

DVo Tj=25 C,Vi=-27V to -38V

Tj=25 C,Vi=-30V to -36V

DVo Tj=25 C,Io=5.0mA to 1.5A

Tj=25 C,Io=250mA to 750mA
Tj=25 C
Io=5mA to 1.0A 0.5 mA

DI

Q

Vi=-27V to -38V 1.0 mA
Io=5mA -1

f=10hz to 100kHz,Ta=25 C

Io=1.0A,Tj=25 C
Vi=-35V,Ta=25 C
Tj=25 C

-23 -24 -25 V

15 480 mV

8 240 mV

15 480 mV

5.0 240 mV
36mA

mV/ C

400

2V

300 mA

2.2 A

mV

2.2 mF

-Vi -Vo

Fig.1 Fixed output regulator

+20V

1

2.2 mF

23

Fig.2 Split power supply(+-15V,1A)

C1

1

23

Contek

C0

1 mF

LM79XX

Contek

LM7815

2

1

3

0.1 mF0.33 mF

1 mF

1N4001

1N4001

Contek

LM7915

+15V

-15V-20V

CONTEK

Contek Microelectronics Co.,Ltd.

http://www.contek-ic.com E-mail:[e-mail]

5

LM79XX LINEAR INTEGRATED CIRCUIT

C1

2.2 mF

C3

2.5 mF

1

23

Contek

LM79XX

R1

R2

Fig.3 Circuit for increasing output voltage

C2

1 mF

-Vo-Vi

CONTEK

Contek Microelectronics Co.,Ltd.

http://www.contek-ic.com E-mail:[e-mail]

6