©2012 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.3
Features
• Output Current in Excess of 1A
• Output Voltages of -5, -6, -8, -9, -12, -15, -18 , -2 4V
• Internal Thermal Overload Protection
• Short Circuit Protection
• Output Transistor Safe Operating Area Compensation
Description
The KA79XX/KA79XXA series of three-terminal negative
regulators are available in TO-220 package and with
several fixed output v oltages, making them useful in a wide
range of applications. Each type employs internal current
limiting, therm a l shutdown and safe operating area
protection, making it essentially indestructible.
TO-220 (Dual Gauge)
1. GND 2. Input 3. Output
1
Vin
Internal Block Digram
VOLTAGE
REFERENCE
+
-
PROTECTION
CIRCUITRY
R1
R2
Rsc
GND
I1 I2
Out
In
Q1
Q2
Output
Input
KA79XX/KA79XXA
3-Terminal 1A Negative Voltage Regulator
KA79XX/KA79XXA
2
Absolute Maximum Ratings
Note:
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm(1S0P)
JEDEC standard: JESD51-3, JESD51-7
2. Assume no ambient airflow
Electrical Characteristics (KA7905)
(VI = -10V, IO = 500mA, 0°C ≤ TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.)
Note
3. Load and line regulatio n are specified at co nstant junc tion temperature. Ch anges in VO due to heati ng effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Value Unit
Input Voltage VI-35 V
Thermal Resistance Junction-Case (Note1) RθJC 5°C/W
Thermal Resistance Junction-Air (Note1, 2) RθJA 65 °C/W
Operating Temperature Range TOPR 0 ~ +125 °C
Storage Temperature Range TSTG - 65 ~ +150 °C
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C -4.8 -5.0 -5.2 V
IO = 5mA to 1A, PO ≤15W
VI = -7V to -20V -4.75 -5.0 -5.25
Line Regulation (Note3) ΔVOTJ = +25°CVI = -7V to -25V - 35 100 mV
VI = -8V to -12V - 8 50
Load Regulation (Note3) ΔVOTJ = +25°C, IO = 5mA to 1.5A - 10 100 mV
TJ =+25°C, IO = 250mA to 750mA - 3 50
Quiescent Current IQTJ =+25°C-36mA
Quiescent Current Chan ge ΔIQIO = 5mA to 1A - 0.05 0.5 mA
VI = -8V to -25V - 0.1 0.8
Temperature Coefficient of VDΔVo/ΔTI
O = 5mA - -0.4 - mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz, TA = +25°C-40-μV
Ripple Rejection RR f = 120Hz, ΔVI = 10V 54 60 - dB
Dropout Voltag e VDTJ =+25°C, IO = 1A - 2 - V
Short Circuit Current ISC TJ =+25°C, VI = -35V - 300 - mA
Peak Current IPK TJ =+25°C-2.2-A
KA79XX/KA79XXA
3
Electrical Characteristics (KA7906) (Continued)
(VI = -11V, IO = 500mA, 0°C ≤ TJ ≤ +125°C, CI =2.2μF, CO = 1μF, unless otherwise specified.)
Note
1. Load and line regulation are sp ecified at consta nt ju ncti on temp er ature. Ch ang es in V O due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ =+25°C -5.75 -6 -6.25 V
IO = 5mA to 1A, PO ≤ 15W
VI = -9V to -21V -5.7 -6 -6.3
Line Regulation (Note1) ΔVOTJ = +25°CVI = -8V to -25V - 10 120 mV
VI = -9V to -13V - 5 60
Load Regulation (Note1) ΔVOTJ = +25°C, IO = 5mA to 1.5A - 10 120 mV
TJ = +25°C, IO = 250mA to 750mA - 3 60
Quiescent Current IQTJ = +25°C-36mA
Quiescent Current Chan ge ΔIQIO = 5mA to 1A - 0.05 0.5 mA
VI = -8V to -25V - 0.1 1.3
Temperature Coefficient of VDΔVo/ΔTI
O = 5mA - -0.5 - mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz, TA =+25°C-130-μV
Ripple Rejection RR f = 120Hz, ΔVI = 10V 54 60 - dB
Dropout Voltag e VDTJ = +25°C, IO = 1A - 2 - V
Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA
Peak Current IPK TJ = +25°C-2.2-A
KA79XX/KA79XXA
4
Electrical Characteristics (KA7908) (Continued)
(VI = -14V, IO = 500mA, 0°C ≤ TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.)
Note
1. Load and line regulatio n are specified at co nstant junc tion temperature. Ch anges in VO due to heati ng effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ =+25°C-7.7-8-8.3
V
IO = 5mA to 1A, PO ≤ 15W
VI = -10V to -23V -7.6 -8 -8.4
Line Regulation (Note1) ΔVOTJ = +25°CVI = -10.5V to -25V - 10 160 mV
VI = -11V to -17V - 5 80
Load Regulation (Note1) ΔVOTJ = +25°C, IO = 5mA to 1.5A - 12 160 mV
TJ = +25°C, IO = 250mA to 750mA - 4 80
Quiescent Current IQTJ = +25°C-36mA
Quiescent Current Chan ge ΔIQIO = 5mA to 1A - 0.05 0.5 mA
VI = -10.5V to -25V - 0.1 1
Temperature Coefficient of VDΔVo/ΔTI
O = 5mA - -0.6 - mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz, TA = +25°C-175-μV
Ripple Rejection RR f = 120Hz, ΔVI = 10V 54 60 - dB
Dropout Voltag e VDTJ =+25°C, IO = 1A - 2 - V
Short Circuit Current ISC TJ =+25°C, VI = -35V - 300 - mA
Peak Current IPK TJ = +25°C-2.2-A
KA79XX/KA79XXA
5
Electrical Characteristics (KA7909) (Continued)
(VI = -15V, IO = 500mA, 0°C ≤ TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.)
Note
1. Load and line regulation are sp ecified at consta nt ju ncti on temp er ature. Ch ang es in V O due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C -8.7 -9.0 -9.3 V
IO = 5mA to 1A, PO ≤ 15W
VI = -1.5V to -23V -8.6 -9.0 -9.4
Line Regulation (Note1) ΔVOTJ =+25°CVI = -11.5V to -26V - 10 180 mV
VI = -12V to -18V - 5 90
Load Regulation (Note1) ΔVOTJ =+25°C, IO = 5mA to 1.5A - 12 180 mV
TJ =+25°C, IO = 250mA to 750mA - 4 90
Quiescent Current IQTJ = +25°C-36mA
Quiescent Current Chan ge ΔIQIO = 5mA to 1A - 0.05 0.5 mA
VI = -11.5V to -26V - 0.1 1
Temperature Coefficient of VDΔVo/ΔTI
O = 5mA - -0.6 - mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz, TA = +25°C-175-μV
Ripple Rejection RR f = 120Hz, ΔVI = 10V 54 60 - dB
Dropout Voltag e VDTJ = +25°C, IO = 1A - 2 - V
Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA
Peak Current IPK TJ = +25°C-2.2-A
KA79XX/KA79XXA
6
Electrical Characteristics (KA7912) (Continued)
(VI = -19V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.)
Note
1. Load and line regulatio n are specified at co nstant junc tion temperature. Ch anges in VO due to heati ng effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C -11.5 -12 -12.5 V
IO = 5mA to 1A, PO ≤ 15W
VI = -15.5V to -27V -11.4 -12 -12.6
Line Regulation (Note1) ΔVOTJ = +25°CVI = -14.5V to -30V - 12 240 mV
VI = -16V to -22V - 6 12 0
Load Regulation (Note1) ΔVOTJ = +25°C, IO = 5mA to 1.5A - 12 240 mV
TJ =+25°C, IO = 250mA to 750mA - 4 120
Quiescent Current IQTJ =+25°C-36mA
Quiescent Current Chan ge ΔIQIO = 5mA to 1A - 0.05 0.5 mA
VI = -14.5V to -30V - 0.1 1
Temperature Coefficient of VDΔVo/ΔTI
O = 5mA - -0.8 - mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz, TA =+25°C - 200 - μV
Ripple Rejection RR f = 120Hz, ΔVI = 10V 54 60 - dB
Dropout Voltag e VDTJ = +25°C, IO = 1A - 2 - V
Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA
Peak Current IPK TJ = +25°C-2.2-A
KA79XX/KA79XXA
7
Electrical Characteristics (KA7915) (Continued)
(VI = -23V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.)
Note
1. Load and line regulation are sp ecified at consta nt ju ncti on temp er ature. Ch ang es in V O due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C -14.4 -15 -15.6 V
IO = 5mA to 1A, PO ≤ 15W
VI = -18V to -30V -14.25 -15 -15.75
Line Regulation (Note1) ΔVOTJ = +25°CVI = -17.5V to -30V - 12 300 mV
VI = -20V to -26V - 6 150
Load Regulation (Note1) ΔVOTJ = +25°C, IO = 5mA to 1.5A - 12 300 mV
TJ =+25°C, IO = 250mA to 750mA - 4 150
Quiescent Current IQTJ =+25°C-36mA
Quiescent Current Chan ge ΔIQIO = 5mA to 1A - 0.05 0.5 mA
VI = -17.5V to -30V - 0.1 1
Temperature Coefficient of VDΔVo/ΔTI
O = 5mA - -0.9 - mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz, TA = +25°C - 250 - μV
Ripple Rejection RR f = 120Hz, ΔVI = 10V 54 60 - dB
Dropout Voltag e VDTJ = +25°C, IO = 1A - 2 - V
Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA
Peak Current IPK TJ = +25°C-2.2-A
KA79XX/KA79XXA
8
Electrical Characteristics (KA7918) (Continued)
(VI = -27V, IO = 500mA, 0°C ≤ TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.)
Note
1. Load and line regulatio n are specified at co nstant junc tion temperature. Ch anges in VO due to heati ng effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C -17.3 -18 -18.7 V
IO = 5mA to 1A, PO ≤ 15W
VI = -22.5V to -33V -17.1 -18 -18.9
Line Regulation (Note1) ΔVOTJ = +25°CVI = -21V to -33V - 15 360 mV
VI = -24V to -30V - 8 180
Load Regulation (Note1) ΔVOTJ = +25°C, IO = 5mA to 1.5A - 15 360 mV
TJ = +25°C, IO = 250mA to 750mA - 5 180
Quiescent Current IQTJ = +25°C-36mA
Quiescent Current Chan ge ΔIQIO = 5mA to 1A - 0.05 0.5 mA
VI = -21V to -33V - 0.1 1
Temperature Coefficient of VDΔVo/ΔTI
O = 5mA - -1 - mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz, TA = +25°C-300-μV
Ripple Rejection RR f = 120Hz, ΔVI = 10V 54 60 - dB
Dropout Voltag e VDTJ = +25°C, IO = 1A - 2 - V
Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA
Peak Current IPK TJ =+25°C-2.2-A
KA79XX/KA79XXA
9
Electrical Characteristics (KA7924) (Continued)
(VI = -33V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.)
Note
1. Load and line regulation are sp ecified at consta nt ju ncti on temp er ature. Ch ang es in V O due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C-23-24-25
V
IO = 5mA to 1A, PO ≤ 15W
VI = -27V to -38V -22.8 -24 -25.2
Line Regulation (Note1) ΔVOTJ =+25°CVI = -27V to -38V - 15 480 mV
VI = -30V to -36V - 8 180
Load Regulation (Note1) ΔVOTJ = +25°C, IO = 5mA to 1.5A - 15 480 mV
TJ = +25°C, IO = 250mA to 750mA - 5 240
Quiescent Current IQTJ = +25°C-36mA
Quiescent Current Chan ge ΔIQIO = 5mA to 1A - 0.05 0.5 mA
VI = -27V to -38V - 0.1 1
Temperature Coefficient of VDΔVo/ΔTI
O = 5mA - -1 - mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz, TA =+25°C-400-μV
Ripple Rejection RR f = 120Hz, ΔVI = 10V 54 6 0 - dB
Dropout Voltag e VDTJ =+25°C, IO = 1A - 2 - V
Short Circuit Current ISC TJ =+25°C, VI = -35V - 300 - mA
Peak Current IPK TJ =+25°C-2.2-A
KA79XX/KA79XXA
10
Electrical Characteristics (KA7912A) (Continued)
(VI = -19V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.)
Note
1. Load and line regulatio n are specified at co nstant junc tion temperature. Ch anges in VO due to heati ng effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ =+25°C -11.75 -12 -12.25 V
IO = 5mA to 1A, PO ≤ 15W
VI = -15.5V to -27V -11.5 -12 -12.5
Line Regulation (Note1) ΔVO
TJ = +25°C
VI = -14.5V to -27V
Io = 1A -12120
mV
VI= -16V to -22V
Io = 1A -660
VI = -14.8V to -30V - 12 120
VI = -16V to -22V, Io = 1A - 12 120
Load Regulation (Note1) ΔVOTJ =+25°C, IO = 5mA to 1.5A - 12 150 mV
TJ =+25°C, IO = 250mA to 750mA - 4 75
Quiescent Current IQTJ =+25°C-36mA
Quiescent Current Chan ge ΔIQIO = 5mA to 1A - 0.05 0.5 mA
VI = -15V to -30V - 0.1 1
Temperature Coefficient of VDΔVo/ΔTI
O = 5mA - -0.8 - mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz, TA =+25°C - 200 - μV
Ripple Rejection RR f = 120Hz, ΔVI = 10V 54 60 - dB
Dropout Voltag e VDTJ =+25°C, IO = 1A - 2 - V
Short Circuit Current ISC TJ =+25°C, VI = -35V - 300 - mA
Peak Current IPK TJ =+25°C-2.2-A
KA79XX/KA79XXA
11
Electrical Characteristics (KA7915A) (Continued)
(VI = -23V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.)
Note
1. Load and line regulation are sp ecified at consta nt ju ncti on temp er ature. Ch ang es in V O due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C -14.7 -15 -15.3 V
IO = 5mA to 1A, PO ≤ 15W
VI = -18V to -30V -14.4 -15 -15.6
Line Regulation (Note1) ΔVO
TJ =+25°C
VI = -17.5V to -30V
Io = 1A -12150
mV
VI = -20V to -26V
Io = 1A -675
VI = -17.9V to -30V - 12 150
VI = -20V to -26V, Io = 1A - 6 150
Load Regulation (Note1) ΔVOTJ = +25°C, IO = 5mA to 1.5A - 12 150 mV
TJ = +25°C, IO = 250mA to 750mA - 4 75
Quiescent Current IQTJ =+25°C-36mA
Quiescent Current Chan ge ΔIQIO = 5mA to 1A - 0.05 0.5 mA
VI = -18.5V to -30V - 0.1 1
Temperature Coefficient of VDΔVo/ΔTI
O = 5mA - -0.9 - mV/°C
Output Noise Voltage VNf = 10Hz to 100kHz, TA =+25°C-250-μV
Ripple Rejection RR f = 120Hz, ΔVI = 10V 54 60 - dB
Dropout Voltag e V DTJ = +25°C, IO = 1A - 2 - V
Short Circuit Current ISC TJ =+25°C, VI = -35V - 300 - mA
Peak Current IPK TJ =+25°C-2.2-A
KA79XX/KA79XXA
12
Typical Performance Characteristics
Figure 1. Output Voltage
Figure 3. Quiescent Current
Figure 5. Short Circuit Current
Figure 2. Load Regulation
Figure 4. Dropout Voltage
4.8
4.85
4.9
4.95
5
5.05
5.1
-40 -25 0 25 50 75 100 125
Vin=10V
Io=40mA
Vin=25V
Io=100mA
Ou
tp
ut
Vo
lta
ge
[-
V
]
TA, Amb ient Temperatu re [oC]
Output Voltage[-V]
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
-40 -25 0 25 50 75 100 125
Quiescent Current [mA]
DVl[V]
TA, Ambient Temperature [oC]
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0.55
0.6
-40 -25 0 25 50 75 100 125
Sh
ort
Cir
cui
t
Cu
rre
nt
[A]
T
A
, Ambient Tem per ature [oC]
Short Circuit Current[A]
-5
-3
-1
1
3
5
7
9
11
13
15
-40 -25 0 25 50 75 100 125
5
Io=0.75
A
Io=1.5A
Lo
ad
Re
gul
ati
on
[m
V]
TA, Ambient Temperature [oC]
Load Regulation[mV]
0
0.5
1
1.5
2
2.5
3
3.5
4
-40 -25 0 25 50 75 100 125
Io=1A
Dropout Voltage [V]
TA, Ambient Temperature [oC]
KA79XX/KA79XXA
13
Typical Applications
Figure 6. Negative Fixed output regula tor
Figure 7. Split power supply ( ±12V/1A)
Note:
(1) To specify an output voltage, su bstitute voltage value for "XX "
(2) Required for stability. For value given, capacitor must be solid tantalum. If aluminium 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 Output
Input
1
32
2.2uF 1uF
Co
CI++
+12V
GND
-12V
+15V
-15V
13
2
1
23
1N4001
1N4001
0.33uF
2.2uF
1uF
1uF
Co
C1
C1
Co+
+
+
+
*
*
KA7812
KA7912
KA79XX/KA79XXA
14
Mechanical Dimensions
Package Dimensions in millimeters
4.50
±0.2
0
9.90
±0.20
1.52
±0.10
0.80
±0.10
2.40
±0.20
10.00
±0.20
1.27
±0.10
ø3.60
±0.10
(8.70)
2.80
±0.10
15.90
±0.20
10.08
±0.30
18.95MAX.
(1.70)
(3.70)(3.00)
(1.46)
(1.00)
(45°)
9.20
±0.20
13.08
±0.20
1.30
±0.10
1.30
+0.1
0
–0.0
5
0.50
+0.10
–0.05
2.54TYP
[2.54
±0.20
]2.54TYP
[2.54
±0.20
]
TO-220 [DUAL GAUGE]
KA79XX/KA79XXA
15
Ordering Information
Product Number Output Voltage Tolerance Packa ge Operating Temperature
KA7905TU
±4% TO-220 (Dual Gauge) 0 ~ +125°C
KA7906TU
KA7908TU
KA7909TU
KA7912TU
KA7915TU
KA7918TU
KA7924TU
KA7912ATU ±2%
KA7915ATU
KA79XX/KA79XXA
6/14/12 0.0m 001
Stock#DS400172
© 2012 Fairchild Semiconductor Corporation
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which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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