Fairchild MC78908CT 3-terminal 1a negative voltage regulator Datasheet

MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
3-TERMINAL 1A NEGATIVE VOLTAGE REGULATORS
The MC79XX series of three-terminal negative regulators are available in
TO-220 package and with several fixed output voltages, making them useful
in a wide range of applications. Each type employs internal current limiting,
thermal shut-down and safe area protection, making it essentially indestructible.
TO-220
FEATURES
•
•
•
•
•
Output Current in Excess of 1A
Output Voltages of -5, -6, -8, -12, -15, -18, -24V
Internal Thermal Overload Protection
Short Circuit Protection
Output Transistor Safe-Area Compensation
1: GND 2: Input 3: Output
ORDERING INFORMATION
Device
Output Voltage
Tolerance
MC79XXCT (LM79XXCT) (KA79XX)
± 4%
KA79XXA
± 2%
Package
Operating Temperature
TO-220
0 ~+125°C
BLOCK DIAGRAM
GND
R1
VOLTAGE
REFERENCE
R2
Out
+
Q1
Q2
I1
I2
PROTECTION
CIRCUITRY
Rsc
In
Rev. C
1999 Fairchild Semiconductor Corporation
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
ABSOLUTE MAXIMUM RATINGS (TA=+25°C, unless otherwise specified)
Characteristic
Symbol
Value
Unit
VI
-35
Thermal Resistance Junction-Cases
Junction-Air
Input Voltage
RθJC
5
65
V
°C / W
°C /W
Operating Temperature Range
TOPR
0 ~ +125
°C
Storage Temperature Range
TSTG
- 65 ~ +150
°C
RθJA
LM7905 ELECTRICAL CHARACTERISTICS
(VI = 10V, lO = 500mA, 0°C ≤T J ≤ +125°C, CI =2.2µF, CO =1µF, unless otherwise specified.)
Characteristic
Output Voltage
Line Regulation
Symbol
VO
∆VO
Test Conditions
TJ =+25°C
IO = 5mA to 1A, PO 15W
VI = -7 to -20V
VI = -7 to -20V
IO=1A
TJ =25°C
VI = -8 to -12V
IO=1A
VI = -7.5 to -25V
Min
Typ
Max
- 4.8
- 5.0
- 5.2
- 4.75
-5.0
- 5.25
5
50
2
25
7
50
7
50
10
100
3
50
mV
3
6
mA
0.05
0.1
- 0.4
0.5
0.8
mA
VI= -8 to -12V
IO=1A
IO = 5mA to 1.5A
Load Regulation
Quiescent Current
Quiescent Current Change
Temperature Coefficient of VD
∆VO
IQ
∆IQ
∆VO/∆T
TJ =+25°C
IO = 250 to 750mA
TJ =+25°C
IO = 5mA to 1A
VI = -8 to -25V
IO = 5mA
Short Circuit Current
ISC
f = 10Hz to 100KHz
TA =+25°C
f = 120Hz, IO = -35V
∆VI = 10V
TJ=+25°C
IO = 1A
TJ =+25°C, VI = -35V
Peak Current
IPK
TJ =+25°C
Output Noise Voltage
VN
Ripple Rejection
RR
Dropout Voltage
VD
54
Unit
V
mV
mV/°C
40
µV
60
dB
2
V
300
mA
2.2
A
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty is used.
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7906 ELECTRICAL CHARACTERISTICS
(VI = 11V, lO = 500mA, 0°C ≤T J≤ +125°C, CI =2.2µF, CO = 1µF, unless otherwise specified.)
Characteristic
Symbol
Output Voltage
VO
Line Regulation
∆VO
Load Regulation
Quiescent Current
Quiescent Current Change
Temperature Coefficient of VD
∆VO
IQ
∆IQ
∆VO/∆T
Test Conditions
TJ = +25°C
IO = 5mA to 1A, PO 15W
VI = - 9 to - 21V
VI = - 8 to - 25V
TJ = 25°C
VI= - 9 to -12V
Min
Typ
Max
- 5.75
-6
- 6.25
- 5.7
-6
- 6.3
10
5
120
60
10
120
3
60
TJ =+ 25°C
IO = 5mA to 1.5A
TJ =+ 25°C
IO = 250 to 750mA
TJ =+ 25°C
IO = 5mA to 1A
VI = -9 to -25V
IO = 5mA
Output Noise Voltage
VN
Ripple Rejection
RR
Dropout Voltage
VD
Short Circuit Current
ISC
f = 10Hz to 100KHz
TA =+ 25°C
f = 120Hz
∆VI = 10V
TJ=+ 25°C
IO = 1A
TJ= +25°C, VI = -35V
Peak Current
IPK
TJ= +25°C
Unit
V
mV
mV
3
54
6
mA
0.5
1.3
mA
-0.5
mV/°C
130
µV
60
dB
2
V
300
mA
2.2
A
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty is used.
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7908 ELECTRICAL CHARACTERISTICS
(VI = 14V, lO = 500mA, 0°C ≤T J ≤ +125°C, CI =2.2µF, CO = 1µF, unless otherwise specified.)
Characteristic
Output Voltage
Line Regulation
Load Regulation
Symbol
VO
∆VO
∆VO
Quiescent Current
IQ
Quiescent Current Change
∆IQ
Temperature Coefficient of VD
∆VO/∆T
Test Conditions
TJ =+ 25°C
IO = 5mA to 1A, PO 15W
VI = -1.5 to -23V
VI = -10.5 to -25V
TJ = 25°C
VI= -11 to -17V
Min
Typ
Max
- 7.7
-8
- 8.3
- 7.6
-8
- 8.4
10
5
100
80
12
160
4
80
TJ =+ 25°C
IO = 5mA to 1.5A
TJ =+ 25°C
IO = 250 to 750mA
TJ =+ 25°C
IO = 5mA to 1A
VI = -11.5 to -25V
IO = 5mA
Output Noise Voltage
VN
Ripple Rejection
RR
Dropout Voltage
VD
Short Circuit Current
ISC
f = 10Hz to 100KHz
TA =+ 25°C
f = 120Hz
∆VI = 10V
TJ=+ 25°C
IO = 1A
TJ=+ 25°C, VI = -35V
Peak Current
IPK
TJ=+ 25°C
Unit
V
mV
mV
54
3
6
mA
0.05
0.1
-0.6
0.5
1
mA
mV/°C
175
µV
60
dB
2
V
300
mA
2.2
A
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7909 ELECTRICAL CHARACTERISTICS
(VI = 14V, lO = 500mA, 0°C ≤T J ≤+ 125°C, CI =2.2µF, CO = 1µF, unless otherwise specified)
Characteristic
Output Voltage
Line Regulation
Load Regulation
Symbol
VO
∆VO
∆VO
Quiescent Current
IQ
Quiescent Current Change
∆IQ
Temperature Coefficient of VD
∆VO/∆T
Test Conditions
Min
Typ
Max
- 8.7
- 9.0
- 9.3
- 8.6
- 9.0
- 9.4
10
5
180
90
TJ =+ 25°C
IO = 5mA to 1.5A
12
180
TJ =+ 25°C
IO = 250 to 750mA
4
90
TJ =+ 25°C
IO = 5mA to 1A, PO 15W
VI = -1.5 to -23V
VI = -10.5 to -25V
TJ = 25°C
VI= -11 to -17V
V
mV
mV
TJ =+ 25°C
IO = 5mA to 1A
VI = -11.5 to -25V
IO = 5mA
f = 10Hz to 100KHz
TA =+ 25°C
f = 120Hz
∆VI = 10V
Unit
3
6
mA
0.05
0.1
-0.6
0.5
1
mA
mV/°C
175
µV
60
dB
2
V
TJ= +25°C, VI = -35V
300
mA
TJ =+25°C
2.2
A
Output Noise Voltage
VN
Ripple Rejection
RR
Dropout Voltage
VD
TJ=+ 25°C
IO = 1A
Short Circuit Current
ISC
Peak Current
IPK
54
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7912 ELECTRICAL CHARACTERISTICS
(VI= 18V, lO =500mA, 0°C ≤T J≤ +125°C, CI =2.2µF, CO = 1µF, unless otherwise specified.)
Characteristic
Output Voltage
Symbol
VO
Line Regulation
∆VO
Load Regulation
∆VO
Quiescent Current
Quiescent Current Change
Temperature Coefficient of VD
IQ
∆IQ
∆VO/∆T
Output Noise Voltage
VN
Ripple Rejection
RR
Dropout Voltage
VD
Short Circuit Current
Peak Current
ISC
IPK
Test Conditions
TJ = +25°C
IO = 5mA to 1A, PO 15W
VI = -15.5 to -27V
V = -14.5 to -30V
TJ = 25°C I
VI= -16 to -22V
TJ =+ 25°C
IO = 5mA to 1.5A
TJ =+ 25°C
IO = 250 to 750mA
TJ =+ 25°C
IO = 5mA to 1A
VI = -15 to -30V
IO = 5mA
f = 10Hz to 100KHz
TA =+ 25°C
f = 120Hz
∆VI = 10V
TJ= +25°C
IO = 1A
TJ=+ 25°C, VI = -35V
TJ=+ 25°C
Min
Typ
Max
-11.5
-12
-12.5
-11.4
-12
-12.6
12
6
240
120
12
240
4
120
3
0.05
0.1
-0.8
6
0.5
1
Unit
V
mV
mV
54
mA
mA
mV/°C
200
µV
60
dB
2
V
300
2.2
mA
A
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7915 ELECTRICAL CHARACTERISTICS
(VI = 23V, IO = 500mA, 0°C ≤T J +125°C, CI =2.2µF, CO = 1µF, unless otherwise specified.)
Characteristic
Symbol
Output Voltage
VO
Line Regulation
∆VO
Load Regulation
∆VO
Quiescent Current
IQ
Quiescent Current Change
∆IQ
Temperature Coefficient of VD
∆VO/∆T
Output Noise Voltage
VN
Ripple Rejection
RR
Dropout Voltage
VD
Short Circuit Current
Peak Current
ISC
IPK
Test Conditions
TJ =+ 25°C
IO = 5mA to 1A, PO 15W
VI = -18 to -30V
VI = -17.5 to -30V
TJ = 25°C
VI= -20 to -26V
TJ =+ 25°C
IO = 5mA to 1.5A
TJ =+ 25°C
IO = 250 to 750mA
TJ =+ 25°C
IO = 5mA to 1A
VI = -18.5 to -30V
IO = 5mA
f = 10Hz to 100Khz
TA =+ 25°C
f = 120Hz
∆VI = 10V
TJ=+25°C
IO = 1A
TJ=+ 25°C, VI = -35V
TJ=+ 25°C
Min
Typ
Max
-14.4
-15
-15.6
-14.25
-15
-15.75
12
6
300
150
12
300
4
150
3
0.05
0.1
-0.9
6
0.5
1
Unit
V
mV
mV
54
mA
mA
mV/°C
250
µV
60
dB
2
V
300
2.2
mA
A
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7918 ELECTRICAL CHARACTERISTICS
(VI = 27V, lO = 500mA, 0°C ≤T J ≤+125°C, CI =2.2µF, CO = 1µF, unless otherwise specified.)
Characteristic
Output Voltage
Symbol
VO
Line Regulation
∆VO
Load Regulation
∆VO
Quiescent Current
Quiescent Current Change
Temperature Coefficient of VD
IQ
∆IQ
∆VO/∆T
Output Noise Voltage
VN
Ripple Rejection
RR
Dropout Voltage
VD
Short Circuit Current
Peak Current
ISC
IPK
Test Conditions
TJ =+ 25°C
IO = 5mA to 1A, PO 15W
VI = -22.5 to -33V
TJ = 25°C VI= -21 to -33V
VI= -24 to -30V
TJ =+ 25°C
IO = 5mA to 1.5A
TJ =+ 25°C
IO = 250 to 750mA
TJ =+ 25°C
IO = 5mA to 1A
VI = -22 to -33V
IO = 5mA
f = 10Hz to 100KHz
TA =+ 25°C
f = 120Hz
∆VI = 10V
TJ=+ 25°C
IO = 1A
TJ=+ 25°C, VI = -35V
TJ=+ 25°C
Min
Typ
Max
-17.3
-18
-18.7
-17.1
-18
-18.9
15
8
360
180
15
360
5
180
3
6
0.5
1
Unit
V
mV
mV
54
mA
mA
-1
mV/°C
300
µV
60
dB
2
V
300
2.2
mA
A
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7924 ELECTRICAL CHARACTERISTICS
(VI = 33V, lO = 500mA, 0°C ≤T J ≤+125°C, CI =2.2µF, CO = 1µF, unless otherwise specified.)
Characteristic
Symbol
Output Voltage
VO
Line Regulation
∆VO
Load Regulation
∆VO
Quiescent Current
Quiescent Current Change
Temperature Coefficient of VD
IQ
∆IQ
∆VO/∆T
Output Noise Voltage
VN
Ripple Rejection
RR
Dropout Voltage
VD
Short Circuit Current
Peak Current
ISC
IPK
Test Conditions
TJ =+25°C
IO = 5mA to 1A, PO ≤15W
VI = -27 to -38V
VI = - 27 to - 38V
TJ = 25°C
VI= - 30 to - 36V
TJ = +25°C
IO = 5mA to 1.5A
TJ =+ 25°C
IO = 250 to 750mA
TJ =+ 25°C
IO = 5mA to 1A
VI = -27 to -38V
IO = 5mA
f = 10Hz to 100KHz
TA =+ 25°C
f = 120Hz
∆VI = 10V
TJ= +25°C
IO = 1A
TJ=+ 25°C, VI = -35V
TJ=+25°C
Min
Typ
Max
- 23
- 24
- 25
- 22.8
- 24
- 25.2
15
8
480
180
15
480
5
240
3
6
0.5
1
Unit
V
mV
mV
54
mA
mA
-1
mV/°C
400
µV
60
dB
2
V
300
2.2
mA
A
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7905A ELECTRICAL CHARACTERISTICS
(VI = 10V, lO = 500mA, 0°C ≤T J ≤ +125°C, CI =2.2µF, CO =1µF, unless otherwise specified.)
Characteristic
Output Voltage
Line Regulation
Symbol
VO
∆VO
Test Conditions
TJ =+ 25°C
IO = 5mA to 1A, PO 15W
VI = -7 to -20V
VI = -7 to -20V
IO=1A
TJ =+25°C
VI = -8 to -12V
IO=1A
VI = -7.5 to -25V
Min
Typ
Max
- 4.9
- 5.0
- 5.1
- 4.8
-5.0
- 5.2
5
50
2
25
7
50
7
50
10
100
3
50
mV
3
6
mA
0.05
0.1
- 0.4
0.5
0.8
mA
VI= -8 to -12V
IO=1A
IO = 5mA to 1.5A
Load Regulation
∆VO
Quiescent Current
IQ
Quiescent Current Change
∆IQ
Temperature Coefficient of VD
∆VO/∆T
TJ =+ 25°C
IO = 250 to 750mA
TJ = +25°C
IO = 5mA to 1A
VI = -8 to -25V
IO = 5mA
Output Noise Voltage
VN
Ripple Rejection
RR
Dropout Voltage
VD
Short Circuit Current
ISC
f = 10Hz to 100KHz
TA =+ 25°C
f = 120Hz, IO = -35V
∆VI = 10V
TJ=+ 25°C
IO = 1A
TJ =+ 25°C, VI = -35V
Peak Current
IPK
TJ =+ 25°C
54
Unit
V
mV
mV/°C
40
µV
60
dB
2
V
300
mA
2.2
A
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty is used.
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7912A ELECTRICAL CHARACTERISTICS
(VI= 18V, lO =500mA, 0°C ≤T J≤ +125°C, CI =2.2µF, CO = 1µF, unless otherwise specified.)
Characteristic
Output Voltage
Symbol
VO
Line Regulation
∆VO
Load Regulation
∆VO
Quiescent Current
Quiescent Current Change
Temperature Coefficient of VD
IQ
∆IQ
∆VO/∆T
Output Noise Voltage
VN
Ripple Rejection
RR
Dropout Voltage
VD
Short Circuit Current
Peak Current
ISC
IPK
Test Conditions
TJ =+ 25°C
IO = 5mA to 1A, PO 15W
VI = -15.5 to -27V
V = -14.5 to -30V
TJ =+25°C I
VI= -16 to -22V
TJ = +25°C
IO = 5mA to 1.5A
TJ =+ 25°C
IO = 250 to 750mA
TJ =+ 25°C
IO = 5mA to 1A
VI = -15 to -30V
IO = 5mA
f = 10Hz to 100Khz
TA =+ 25°C
f = 120Hz
∆VI = 10V
TJ=+ 25°C
IO = 1A
TJ=+ 25°C, VI = -35V
TJ=+ 25°C
Min
Typ
Max
-11.75
-12
-12.25
-11.5
-12
-12.5
12
6
240
120
12
240
4
120
3
0.05
0.1
-0.8
6
0.5
1
Unit
V
mV
mV
54
mA
mA
mV/°C
200
µV
60
dB
2
V
300
2.2
mA
A
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
LM7915A ELECTRICAL CHARACTERISTICS
(VI = 23V, lO = 500mA, 0°C ≤T J≤ +125°C, CI =2.2µF, CO = 1µF, unless otherwise specified.)
Characteristic
Symbol
Output Voltage
VO
Line Regulation
∆VO
Load Regulation
∆VO
Quiescent Current
IQ
Quiescent Current Change
∆IQ
Temperature Coefficient of VD
∆VO/∆T
Output Noise Voltage
VN
Ripple Rejection
RR
Dropout Voltage
VD
Short Circuit Current
Peak Current
ISC
IPK
Test Conditions
TJ = +25°C
IO = 5mA to 1A, PO 15W
VI = -18 to -30V
TJ =+25°C VI = -17.5 to -30V
VI= -20 to -26V
TJ =+ 25°C
IO = 5mA to 1.5A
TJ =+ 25°C
IO = 250 to 750mA
TJ =+ 25°C
IO = 5mA to 1A
VI = -18.5 to -30V
IO = 5mA
f = 10Hz to 100KHz
TA =+25°C
f = 120Hz
∆VI = 10V
TJ= +25°C
IO = 1A
TJ=+ 25°C, VI = -35V
TJ=+ 25°C
Min
Typ
Max
-14.7
-15
-15.3
-14.4
-15
-15.6
12
6
300
150
12
300
4
150
3
0.05
0.1
-0.9
6
0.5
1
Unit
V
mV
mV
54
mA
mA
mV/°C
250
µV
60
dB
2
V
300
2.2
mA
A
* Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
TYPICAL PERFORMANCE CHARACTERISTICS
Fig.1 Output Voltage
Fig. 2 Load Regulation
15
Vin=10V
Io=40mA
5.05
13
Load Regulation [mV]
Output Voltage [-V]
5.1
5
4.95
4.9
Vin=25V
Io=100mA
4.85
Io=1.5A
11
9
7
5
3
1
Io=0.75A
-1
-3
4.8
-5
-25
0
25
50
75
100
125
-40
-25
0
25
50
75
100
TA, Ambient Temperature [ oC]
TA, Ambient Temperature [ oC]
Fig.3 Quiescent Current
Fig. 4 Dropout Voltage
5
4
4.5
4
3.5
Dropout Voltage [V]
Quiescent Current [mA]
-40
3.5
3
2.5
2
1.5
1
0.5
125
3
2.5
2
1.5
Io=1A
1
0.5
0
0
-40
-25
0
25
50
75
100
125
TA, Ambient Temperature [oC]
Short Circuit Current [A]
0.6
0.55
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
-0.05
-0.1
-25
0
25
50
75
-25
0
25
50
75
100
TA, Ambient Temperature [oC]
Fig.5 Short Circuit Current
-40
-40
100
TA, Ambient Temperature [oC]
125
125
MC79XX (LM79XX) (KA79XX/A)
FIXED VOLTAGE REGULATOR (NEGATIVE)
TYPICAL APPLICATIONS
Fig. 6 Negative Fixed output regulator
µF
+ 2.2µ
µF
+ 1µ
CO
1
CI
2
- VI
Notes:
(1)
To specify an output voltage, substitute voltage value
for “XX “
(2)
Required for stability. For value given, capacitor
must be solid tantalum. If aluminum electronics are
used, at least ten times value shown should be
selected. CI is required if regulator is located an
appreciable
distance from power supply filter.
(3)
To improve transient response. If large capacitors
are used, a high current diode from input to output
(1N400l or similar) should be introduced to protect
the device from momentary input short circuit.
KA79XX
3
- VO
Fig. 7 Split power supply (±
± 12V/1A)
1
+ 15V
KA7812
3
+
0.33µ
µF
2
1µ
µF
1µ
µF +
1
2
1N4001
*
GND
µF
+ 2.2µ
- 15V
+12V
+
KA7912
3
*: Against potential latch-up problems.
1N4001
*
-12V
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intended to be an exhaustive list of all such trademarks.
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MICROWIRE™
POP™
PowerTrench®
QFET™
QS™
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SuperSOT™-8
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UHC™
VCX™
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failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in significant injury to the
user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
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effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
Advance Information
Formative or
In Design
This datasheet contains the design specifications for
product development. Specifications may change in any
manner without notice.
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First Production
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been discontinued by Fairchild semiconductor. The
datasheet is printed for reference information only.
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