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KA79MXX / LM79MXX — 3-Terminal 0.5 A Negative Voltage Re gulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA79MXX / LM79MXX Rev. 1.1.1
September 2014
KA79MXX / LM79MXX
3-Terminal 0.5 A Negative Voltage Regulator
Features
• No External Components Required
• Output Current in Excess of 0.5 A
• Internal Thermal Overload
• Internal Short-Circuit Current Limiting
• Output Transistor Safe Area Compensation
• Output Voltages: -5 V, -12 V
Ordering Information(1)
Note:
1. Refer to below figure for TM / TF suffix of DPAK packing option.
Product Number Package Packing Method Operating Temperature
KA79M05TU TO-220 (Dual Gauge) Rail
0 to +125°C
KA79M05RTM
D-PAK Tape and Reel
KA79M05RTF
KA79M12RTM
KA79M12RTF
LM79M05CT TO-220 (Single Gauge) Rail
Description
The KA79MXX / LM79MXX series of three terminal
medium current negative voltage regulators are mono-
lithic integrated circuits designed as fixed-voltage regula-
tors. These regulators employ internal current limiting,
thermal shutdown, and safe area compensation.
TO-220
D-PAK
1. GND 2. Input 3. Output
1
1
Input
Input
KA79MXX / LM79MXX — 3-Terminal 0.5 A Negative Voltage Re gulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA79MXX / LM79MXX Rev. 1.1.1 2
Block Diagram
Figure 1. Block Diagram
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the re co mmen ded operating conditions and s tres si ng the parts to these level s i s not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only.
Symbol Parameter Value Unit
VIInput Voltage VO = -5 V to -12 V -35 V
RθJC Thermal Resistance, Junctio n-Ca se TO-220 5 °C/W
RθJA Thermal Resistance, Junctio n-Ai r TO-220 65 °C/W
TOPR Operating Temperature Range 0 to +125 °C
TSTG Storage Temperature Range -65 to +150 °C
Q1
Q2 Q3
Q4
Q5
Q6 Q7
Q8
Q9 Q10 Q11
Q12 Q13
Q14
Q15
Q16
Q17 Q18
Q19
Q20 Q21 Q22
Q23
Q24 Q25
Q26 Q27
R1
R2
R3
R4 R5
R6
R7
R8
R9 R10 R11
R12
R13
R15
R14
R16
R17
R18 R19 R20
R21
R22
R23
R24 R25
D1
D2
D3
D4
D5
C1 C2
GND
OUT
IN
KA79MXX / LM79MXX — 3-Terminal 0.5 A Negative Voltage Re gulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA79MXX / LM79MXX Rev. 1.1.1 3
Electrical Characteristics (KA79M05 / KA79M05R / LM79M05)
Refer to test circuit, 0°C ≤ TJ ≤ +125°C, lO = 350 mA, VI = -10 V, CI = 0.33 μF, CO = 0.1 μF unless otherwise specifie d.
Note:
2. 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.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C -4.80 -5.00 -5.20 V
IO = 5 mA to 350 mA, VI = -7 V to -25 V -4.75 -5.00 -5.25
ΔVOLine Regulation(2) TJ =+25°CVI = -7 V to -25 V 7 50 mV
VI = -8 V to -25 V 2 30
ΔVOLoad Regulation(2) IO = 5 mA to 500 mA, TJ = +25°C30100mV
IQQuiescent Current TJ= +25°C3.06.0mA
ΔIQQuiescent Current Change IO = 5 mA to 350 mA 0.4 mA
IO = 200 mA, VI = -8 V to -25 V 0.4
ΔVo/ΔT Output Voltage Drift IO = 5 mA -0.2 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C40μV
RR Ripple Rejection f = 120 Hz, VJ = -8 V to -18 V 54 60 dB
VDDropout Voltage TJ = +25°C, IO = 500 mA 1.1 V
ISC Short-Circuit Current TJ = +25°C, VI = -35 V 140 mA
IPK Peak Current TJ = +25°C650mA
KA79MXX / LM79MXX — 3-Terminal 0.5 A Negative Voltage Re gulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA79MXX / LM79MXX Rev. 1.1.1 4
Electrical Characteristics (KA79M12R)
Refer to test circuit, 0°C ≤ TJ ≤ +125°C, lO = 350 mA, VI = -19 V, CI = 0.33 μF, CO = 0.1 μF unless otherwise specified.
Note:
3. Load and line regulation are specified at constant junction temperature. Change in VO due to heating e ffects must
be taken into account separately. Pulse testing with low duty is used.
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C -11.5 -12.0 -12.5 V
IO = 5 mA to 350 mA,
VI = -14.5 V to -30 V -11.4 -12.0 -12.6
ΔVOLine Regulation(3) TJ =+25°CVI = -14.5 V to -30 V 8.0 80 mV
VI = -15 V to -25 V 3.0 50
ΔVOLoad Regulation(3) TJ = +25°CI
O = 5.0 mA to 500 mA 30 240 mV
IQQuiescent Current TJ = +25°C36mA
ΔIQQuiescent Current Change IO = 5 mA to 350 mA 0.4 mA
VI = -14.5 V to -30 V 0.4
ΔVO/ΔT Output Voltage Drift IO = 5 mA -0.8 mV/°C
VNOutput Noise Voltage f = 10 Hz to 100 kHz, TA = +25°C75μV
RR Ripple Rejection f = 120 Hz, VI = -15 V to -25 V 54 60 dB
VDDropout Voltage IO = 500 mA, TJ = +25°C1.1V
ISC Short Circuit Current VI = -35 V, TJ = +25°C140mA
IPK Peak Current TJ = +25°C650mA
KA79MXX / LM79MXX — 3-Terminal 0.5 A Negative Voltage Re gulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA79MXX / LM79MXX Rev. 1.1.1 5
Typical Performance Characteristics
Figure 2. Dropout Voltage
0 25 50 75 100 125 150
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
IOUT = 500mA
IOUT = 400mA
IOUT = 300m A
IOUT = 200mA
IOUT = 100mA
IOUT = 0mA
VIN = -10V
VO = -5V
VD - Dropout Voltage [V]
TA - Temperature [oC]
KA79MXX / LM79MXX — 3-Terminal 0.5 A Negative Voltage Re gulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA79MXX / LM79MXX Rev. 1.1.1 6
Typical Applications
Figure 3. Fixed Output Regulator
Figure 4. Variable Output
Notes:
4. To specify an output voltage, substitute voltage value for "XX".
5. CI is required if the regulator is located an appreciable distance from the power supply filter. For value given,
capacitor must b e solid tantal um. If aluminium el ectronics are us ed, 25 μF alumin um electrolyti c may be substituted.
6. C2 improves transient response and ripple rejection. Do not increase beyond 50 μF.
1.0 μF
2.0 μF
3
1
2
VIVO
KA79MXX
LM79MXX
VO
VI
R2
R1
C3
SOLID
TANTALUM
1 μF
_
+
C1
2.2 μF
SOLID
TANTALUM
_
+C2
25 μF
_
+
KA79MXX
LM79MXX
KA79MXX / LM79MXX — 3-Terminal 0.5 A Negative Voltage Re gulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA79MXX / LM79MXX Rev. 1.1.1 7
Physical Dimensions
Figure 5. TO-220, MOLDED, 3LEAD, JEDEC VARIATION AB
KA79MXX / LM79MXX — 3-Terminal 0.5 A Negative Voltage Re gulator
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA79MXX / LM79MXX Rev. 1.1.1 8
Physical Dimensions (Continued)
Figure 6. 3-LEAD, TO-252, JEDEC TO-252 VAR. AB, SURFACE MOUNT (DPAK)
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© Fairchild Semiconductor Corporation www.fairchildsemi.com
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