Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LM79XXA
LINEAR INTEGRATED CIRCUIT
3 TERMINAL 1.5A NEGATIVE
VOLTAGE REGULATOR

DESCRIPTION
The UTC LM79XXA series of three-terminal negative regulators is
available 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.

FEATURES
* Output Current Up to 1.5A
*-7V, -15V Output Voltage Available
* Thermal Overload Protection

ORDERING INFORMATION
Ordering Number
Lead Free
LM79XXAL-TA3-T
Note: O: Output
G: GND

Halogen Free
LM79XXAG-TA3-T
I: Input
Package
TO-220
Pin Assignment
1
2
3
G
I
O
Packing
Tube
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
TO-220
07:-7.0V
15: -15V
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Copyright © 2014 Unisonic Technologies Co., Ltd
MARKING
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LM79XXA

LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
GND
R1
R2
Voltage
Reference
OUTPUT
Protection
Circuitry
RSC
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
INPUT
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LM79XXA

LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (TA=25C, unless otherwise specified)
PARAMETER
SYMBOL
RATING
UNIT
Input Voltage
VIN
-35
V
Output Current
IOUT
1.5
A
Power Dissipation
PD
Internally Limited
W
Operating Temperature
TOPR
-40 ~ +85
C
Storage Temperature
TSTG
-65 ~ +150
C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

THERMAL DATA
PARAMETER
Junction to Ambient
Junction to Case

SYMBOL
θJA
θJC
RATING
65
5
UNIT
C /W
C /W
ELECTRICAL CHARACTERISTICS
(IOUT=0.5A, TJ=0C~125C, CI=2.2uF, CO=1uF, unless otherwise specified)
For UTC LM7907 (VIN=-13V)
PARAMETER
Output Voltage
Dropout Voltage
Line Regulation
Load Regulation
Quiescent Current
Quiescent Current Change
Output Noise Voltage
Output Voltage Drift
Ripple Rejection
Peak Current
SYMBOL
TEST CONDITIONS
MIN
TJ=25C -6.72
VOUT
VIN=-9V~-22V,
-6.65
IOUT=5mA~1A, PD≦15W
VD
IOUT=1.5A
TJ=25C
VIN=-9V~-25V
TJ=25C
VOUT
VIN=-10V~-15V
TJ=25C
IOUT=5mA~1.5A
TJ=25C
VOUT
IOUT=250mA~750mA
TJ=25C
IQ
TJ=25C
IOUT=5mA~1A
IQ
VIN=-9V~-25V
eN
f=10Hz~100kHz
TA=25C
VOUT/T IOUT=5mA
RR
VIN=-10V~-20V, f=120Hz
54
IPEAK
TJ=25C
UNISONIC TECHNOLOGIES CO., LTD
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TYP
-7.0
2
10
5
12
4
3
0.05
0.1
175
-0.6
60
2.2
MAX
-7.28
UNIT
V
-7.35
V
140
70
170
90
6
0.5
1.0
V
mV
mV
mV
mV
mA
mA
mA
μV
mV/C
dB
A
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LM79XXA

LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
For UTC LM7915 (VIN=-23V)
PARAMETER
SYMBOL
Output Voltage
VOUT
Dropout Voltage
VD
Line Regulation
VOUT
Load Regulation
VOUT
Quiescent Current
IQ
IQ
Quiescent Current Change
Output Noise Voltage
Output Voltage Drift
Ripple Rejection
Peak Current
eN
VOUT/T
RR
IPEAK
TEST CONDITIONS
MIN
TYP MAX UNIT
V
TJ=25C -14.40 -15.0 -15.60
VIN=-17.5V~-30V
-14.25
-15.75
V
IOUT=5mA~1A, PD≦15W
IOUT=1.5A
TJ=25C
2
V
TJ=25C
12
300
mV
VIN=-17.5V~-30V
VIN=-20V~-26V
TJ=25C
6
150
mV
TJ=25C
12
300
mV
IOUT=5mA~1.5A
IOUT=250mA~750mA
TJ=25C
4
150
mV
TJ=25C
3
6
mA
IOUT=5mA~1A
0.05
0.5
mA
VIN=-17.5V~-30.5V
0.1
1.0
mA
f=10Hz~100kHz
TA=25C
250
μV
IOUT=5mA
-0.9
mV/C
VIN=-18.5V~-28.5V, f=120Hz
54
60
dB
TJ=25C
2.2
A
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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LM79XXA

LINEAR INTEGRATED CIRCUIT
APPLICATION CIRCUITS
-VIN
2
-VOUT
UTC LM79XXA 3
1
CI
2.2 μF
CO
1 μF
Fig.1 Fixed output regulator
+20V
1
+15V
UTC LM7815A 3
0.33 μF
2
0.1 μ
F
1N4001
2.2 μF
1
1 μF
1N4001
2
UTC LM7915A
3
-20V
-15V
Fig.2 Split power supply(+-15V,1A)
C3
2.5 μF
CI
2.2 μF
R1
CO
1 μF
1
2
UTC LM79XXA
3
R2
-VIN
-VOUT
Fig.3 Circuit for increasing output voltage
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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www.unisonic.com.tw
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