November 15, 2007
LM120/LM320
Series 3-Terminal Negative Regulators
General Description
The LM120 series are three-terminal negative regulators with
a fixed output voltage of −5V, −12V, and −15V, and up to 1.5A
load current capability. Where other voltages are required, the
LM137 and LM137HV series provide an output voltage range
of −1.2V to −47V.
The LM120 need only one external component—a compen-
sation capacitor at the output, making them easy to apply.
Worst case guarantees on output voltage deviation due to any
combination of line, load or temperature variation assure sat-
isfactory system operation.
Exceptional effort has been made to make the LM120 Series
immune to overload conditions. The regulators have current
limiting which is independent of temperature, combined with
thermal overload protection. Internal current limiting protects
against momentary faults while thermal shutdown prevents
junction temperatures from exceeding safe limits during pro-
longed overloads.
Although primarily intended for fixed output voltage applica-
tions, the LM120 Series may be programmed for higher out-
put voltages with a simple resistive divider. The low quiescent
drain current of the devices allows this technique to be used
with good regulation.
Features
■Preset output voltage error less than ±3%
■Preset current limit
■Internal thermal shutdown
■Operates with input-output voltage differential down to 1V
■Excellent ripple rejection
■Low temperature drift
■Easily adjustable to higher output voltage
LM120 Series Packages and Power Capability
Rated Design
Device Package Power Load
Dissipation Current
LM120/LM320 TO-3 (K) 20W 1.5A
TO-39 (H) 2W 0.5A
LM320 TO-220 (T) 15W 1.5A
Typical Applications
Dual Trimmed Supply
776703
Fixed Regulator
776702
*Required if regulator is separated from filter capacitor by more than 3 inch-
es. For value given, capacitor must be solid tantalum. 25 μF aluminum
electrolytic may be substituted.
†Required for stability. For value given, capacitor must be solid tantalum. 25
μF aluminum electrolytic may be substituted. Values given may be increased
without limit.
For output capacitance in excess of 100 μF, a high current diode from input
to output (1N4001, etc.) will protect the regulator from momentary input
shorts.
© 2007 National Semiconductor Corporation 7767 www.national.com
LM120/LM320 Series 3-Terminal Negative Regulators
Absolute Maximum Ratings
−5 Volt Regulators (Notes 5, 3)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation Internally Limited
Input Voltage −25V
Input-Output Voltage Differential 25V
Junction Temperatures (Note 1)
Storage Temperature Range −65°C to +150°C
Lead Temperature
(Soldering, 10 sec.) 300°C
Plastic 260°C
−5 Volt Regulators
Electrical Characteristics (Note 3)
Order Numbers
Metal Can Package
Units
LM120K-5.0
(TO-3)
LM320K-5.0
(TO-3)
Design Output Current (ID)
Device Dissipation (PD)
1.5A
20W
Parameter Conditions (Note 1) Min Typ Max Min Typ Max
Output Voltage TJ = 25°C, VIN =10V, −5.1 −5 −4.9 −5.2 −5 −4.8 V
ILOAD = 5 mA
Line Regulation TJ = 25°C, ILOAD = 5 mA, 10 25 10 40 mV
VMIN ≤ VIN ≤ VMAX
Input Voltage −25 −7 −25 −7 V
Ripple Rejection f = 120 Hz 54 64 54 64 dB
Load Regulation, TJ = 25°C, VIN = 10V, 50 75 60 100 mV
(Note 2) 5 mA ≤ ILOAD ≤ ID
Output Voltage, −7.5V ≤ VIN ≤ VMAX,−5.20 −4.80 −5.25 −4.75 V
(Note 1) 5 mA ≤ ILOAD ≤ ID, P ≤ PD
Quiescent Current VMIN ≤ VIN ≤ VMAX 1 2 1 2 mA
Quiescent Current TJ = 25°C
Change VMIN ≤ VIN ≤ VMAX 0.1 0.4 0.1 0.4 mA
5 mA ≤ ILOAD ≤ ID 0.1 0.4 0.1 0.4 mA
Output Noise Voltage TA = 25°C, CL = 1 μF, IL = 5 mA, 150 150 μV
VIN = 10V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability 5 50 5 50 mV
Thermal Resistance
Junction to Case 3 3 °C/W
Junction to Ambient 35 35 °C/W
www.national.com 2
LM120/LM320
−5 Volt Regulators
Electrical Characteristics (Note 3)
Order Numbers
Metal Can Package
Units
LM120H-5.0
(TO-39)
LM320H-5.0
(TO-39)
Design Output Current (ID)
Device Dissipation (PD)
0.5A
2W
Parameter Conditions (Note 1) Min Typ Max Min Typ Max
Output Voltage TJ = 25°C, VIN =10V, −5.1 −5 −4.9 −5.2 −5 −4.8 V
ILOAD = 5 mA
Line Regulation TJ = 25°C, ILOAD = 5 mA, 10 25 10 40 mV
VMIN ≤ VIN ≤ VMAX
Input Voltage −25 −7 −25 −7 V
Ripple Rejection f = 120 Hz 54 64 54 64 dB
Load Regulation, TJ = 25°C, VIN = 10V, 30 50 30 50 mV
(Note 2) 5 mA ≤ ILOAD ≤ ID
Output Voltage, −7.5V ≤ VIN ≤ VMAX,−5.20 −4.80 −5.25 −4.75 V
(Note 1) 5 mA ≤ ILOAD ≤ ID, P ≤ PD
Quiescent Current VMIN ≤ VIN ≤ VMAX 1 2 1 2 mA
Quiescent Current TJ = 25°C
Change VMIN ≤ VIN ≤ VMAX 0.05 0.4 0.05 0.4 mA
5 mA ≤ ILOAD ≤ ID 0.04 0.4 0.04 0.4 mA
Output Noise Voltage TA = 25°C, CL = 1 μF, IL = 5 mA, 150 150 μV
VIN = 10V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability 5 50 5 50 mV
Thermal Resistance
Junction to Case (Note 4) (Note 4) °C/W
Junction to Ambient (Note 4) (Note 4) °C/W
3 www.national.com
LM120/LM320
−5 Volt Regulators
Electrical Characteristics (Note 3)
Order Numbers
Power Plastic Package
Units
LM320T-5.0
(TO-220)
Design Output Current (ID)
Device Dissipation (PD)
1.5A
15W
Parameter Conditions (Note 1) Min Typ Max
Output Voltage TJ = 25°C, VIN =10V, −5.2 −5 −4.8 V
ILOAD = 5 mA
Line Regulation TJ = 25°C, ILOAD = 5 mA, 10 40 mV
VMIN ≤ VIN ≤ VMAX
Input Voltage −25 −7.5 V
Ripple Rejection f = 120 Hz 54 64 dB
Load Regulation, TJ = 25°C, VIN = 10V, 50 100 mV
(Note 2) 5 mA ≤ ILOAD ≤ ID
Output Voltage, −7.5V ≤ VIN ≤ VMAX,−5.25 −4.75 V
(Note 1) 5 mA ≤ ILOAD ≤ ID, P ≤ PD
Quiescent Current VMIN ≤ VIN ≤ VMAX 1 mA
Quiescent Current TJ = 25°C
Change VMIN ≤ VIN ≤ VMAX 0.1 0.4 mA
5 mA ≤ ILOAD ≤ ID 0.1 0.4 mA
Output Noise Voltage TA = 25°C, CL = 1 μF, IL = 5 mA, 150 μV
VIN = 10V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability 10 mV
Thermal Resistance
Junction to Case 4 °C/W
Junction to Ambient 50 °C/W
Note 1: This specification applies over −55°C ≤ TJ ≤ +150°C for the LM120 and 0°C ≤ TJ ≤ +125°C for the LM320.
Note 2: Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects must be taken into account separately. To
ensure constant junction temperature, low duty cycle, pulse testing is used. The LM120/LM320 series does have low thermal feedback, improving line and load
regulation. On all other tests, even though power dissipation is internally limited, electrical specifications apply only up to PD.
Note 3: For −5V 3 amp regulators, see LM145 data sheet.
Note 4: Thermal resistance of typically 85°C/W (in 400 linear feet air flow), 224°C/W (in static air) junction to ambient, of typically 21°C/W junction to case.
Note 5: Refer to RETS120-5H drawing for LM120H-5.0 or RETS120-5K drawing for LM120-5K military specifications.
www.national.com 4
LM120/LM320
Absolute Maximum Ratings
−12 Volt Regulators (Note 9)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation Internally Limited
Input Voltage −35V
Input-Output Voltage Differential 30V
Junction Temperatures (Note 6)
Storage Temperature Range −65°C to +150°C
Lead Temperature
(Soldering, 10 sec.) 300°C
−12 Volt Regulators
Electrical Characteristics
Order Numbers
Metal Can Package
Units
LM120K-12
(TO-3)
LM320K-12
(TO-3)
Design Output Current (ID)1A
Device Dissipation (PD)20W
Parameter Conditions (Note 6) Min Typ Max Min Typ Max
Output Voltage TJ = 25°C, VIN = 17V, −12.3 −12 −11.7 −12.4 −12 −11.6 V
ILOAD = 5 mA
Line Regulation TJ = 25°C, ILOAD = 5 mA, 4 10 4 20 mV
VMIN ≤ VIN ≤ VMAX
Input Voltage −32 −14 −32 −14 V
Ripple Rejection f = 120 Hz 56 80 56 80 dB
Load Regulation, TJ = 25°C, VIN = 17V, 30 80 30 80 mV
(Note 7) 5 mA ≤ ILOAD ≤ ID
Output Voltage, 14.5V ≤ VIN ≤ VMAX,−12.5 −11.5 −12.6 −11.4 V
(Note 6) 5 mA ≤ ILOAD ≤ ID, P ≤ PD
Quiescent Current VMIN ≤ VIN ≤ VMAX 2 4 2 4 mA
Quiescent Current TJ = 25°C
Change VMIN ≤ VIN ≤ VMAX 0.1 0.4 0.1 0.4 mA
5 mA ≤ ILOAD ≤ ID 0.1 0.4 0.1 0.4 mA
Output Noise Voltage TA = 25°C, CL = 1 μF, IL = 5 mA, 400 400 μV
VIN = 17V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability 12 120 12 120 mV
Thermal Resistance
Junction to Case 3 3 °C/W
Junction to Ambient 35 35 °C/W
−12 Volt Regulators
Electrical Characteristics
Order Numbers
Metal Can Package
Units
LM120H-12
(TO-39)
LM320H-12
(TO-39)
Design Output Current (ID)0.2A
Device Dissipation (PD)2W
Parameter Conditions (Note 6) Min Typ Max Min Typ Max
Output Voltage TJ = 25°C, VIN = 17V, −12.3 −12 −11.7 −12.4 −12 −11.6 V
ILOAD = 5 mA
Line Regulation TJ = 25°C, ILOAD = 5 mA, 4 10 4 20 mV
VMIN ≤ VIN ≤ VMAX
5 www.national.com
LM120/LM320
Order Numbers
Metal Can Package
Units
LM120H-12
(TO-39)
LM320H-12
(TO-39)
Design Output Current (ID)0.2A
Device Dissipation (PD)2W
Parameter Conditions (Note 6) Min Typ Max Min Typ Max
Input Voltage −32 −14 −32 −14 V
Ripple Rejection f = 120 Hz 56 80 56 80 dB
Load Regulation, TJ = 25°C, VIN = 17V, 10 25 10 40 mV
(Note 7) 5 mA ≤ ILOAD ≤ ID
Output Voltage, 14.5V ≤ VIN ≤ VMAX,−12.5 −11.5 −12.6 −11.4 V
(Note 6) 5 mA ≤ ILOAD ≤ ID, P ≤ PD
Quiescent Current VMIN ≤ VIN ≤ VMAX 2 4 2 4 mA
Quiescent Current TJ = 25°C
Change VMIN ≤ VIN ≤ VMAX 0.05 0.4 0.05 0.4 mA
5 mA ≤ ILOAD ≤ ID 0.03 0.4 0.03 0.4 mA
Output Noise Voltage TA = 25°C, CL = 1 μF, IL = 5 mA, 400 400 μV
VIN = 17V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability 12 120 12 120 mV
Thermal Resistance
Junction to Case (Note 8) (Note 8) °C/W
Junction to Ambient (Note 8) (Note 8) °C/W
−12 Volt Regulators
Electrical Characteristics
Order Numbers
Power Plastic Package
Units
LM320T-12
(TO-220)
Design Output Current (ID)1A
Device Dissipation (PD)15W
Parameter Conditions (Note 6) Min Typ Max
Output Voltage TJ = 25°C, VIN = 17V, −12.4 −12 −11.6 V
ILOAD = 5 mA
Line Regulation TJ = 25°C, ILOAD = 5 mA, 4 20 mV
VMIN ≤ VIN ≤ VMAX
Input Voltage −32 −14.5 V
Ripple Rejection f = 120 Hz 56 80 dB
Load Regulation, TJ = 25°C, VIN = 17V, 30 80 mV
(Note 7) 5 mA ≤ ILOAD ≤ ID
Output Voltage, 14.5V ≤ VIN ≤ VMAX,−12.6 −11.4 V
(Note 6) 5 mA ≤ ILOAD ≤ ID, P ≤ PD
Quiescent Current VMIN ≤ VIN ≤ VMAX 2 4 mA
Quiescent Current TJ = 25°C
Change VMIN ≤ VIN ≤ VMAX 0.1 0.4 mA
5 mA ≤ ILOAD ≤ ID 0.1 0.4 mA
Output Noise Voltage TA = 25°C, CL = 1 μF, IL = 5 mA, 400 μV
VIN = 17V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability 24 mV
www.national.com 6
LM120/LM320
Order Numbers
Power Plastic Package
Units
LM320T-12
(TO-220)
Design Output Current (ID)1A
Device Dissipation (PD)15W
Parameter Conditions (Note 6) Min Typ Max
Thermal Resistance
Junction to Case
Junction to Ambient
4 °C/W
50 °C/W
Note 6: This specification applies over −55°C ≤ TJ ≤ +150°C for the LM120 and 0°C ≤ TJ ≤ +125°C for the LM320.
Note 7: Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects must be taken into account separately. To
ensure constant junction temperature, low duty cycle, pulse testing is used. The LM120/LM320 series does have low thermal feedback, improving line and load
regulation. On all other tests, even though power dissipation is internally limited, electrical specifications apply only up to PD.
Note 8: Thermal resistance of typically 85°C/W (in 400 linear feet/min air flow), 224°C/W (in static air) junction to ambient, of typically 21°C/W junction to case.
Note 9: Refer to RETS120H-12 drawing for LM120H-12 or RETS120-12K drawing for LM120K-12 military specifications.
7 www.national.com
LM120/LM320
Absolute Maximum Ratings
−15 Volt Regulators (Note 13)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation Internally Limited
Input Voltage
LM120/LM320 −40V
LM320T −35V
Input-Output Voltage Differential 30V
Junction Temperatures (Note 10)
Storage Temperature Range −65°C to +150°C
Lead Temperature
(Soldering, 10 sec.) 300°C
−15 Volt Regulators
Electrical Characteristics
Order Numbers
Metal Can Package
Units
LM120K-15
(TO-3)
LM320K-15
(TO-3)
Design Output Current (ID)1A
Device Dissipation (PD)20W
Parameter Conditions (Note 10) Min Typ Max Min Typ Max
Output Voltage TJ = 25°C, VIN = 20V, −15.3 −15 −14.7 −15.4 −15 −14.6 V
ILOAD = 5 mA
Line Regulation TJ = 25°C, ILOAD = 5 mA, 5 10 5 20 mV
VMIN ≤ VIN ≤ VMAX
Input Voltage −35 −17 −35 −17 V
Ripple Rejection f = 120 Hz 56 80 56 80 dB
Load Regulation, TJ = 25°C, VIN = 20V, 30 80 30 80 mV
(Note 11) 5 mA ≤ ILOAD ≤ ID
Output Voltage, 17.5V ≤ VIN ≤ VMAX,−15.5 −14.5 −15.6 −14.4 V
(Note 10) 5 mA ≤ ILOAD ≤ ID, P ≤ PD
Quiescent Current VMIN ≤ VIN ≤ VMAX 2 4 2 4 mA
Quiescent Current TJ = 25°C
Change VMIN ≤ VIN ≤ VMAX 0.1 0.4 0.1 0.4 mA
5 mA ≤ ILOAD ≤ ID 0.1 0.4 0.1 0.4 mA
Output Noise Voltage TA = 25°C, CL = 1 μF, IL = 5 mA, 400 400 μV
VIN = 20V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability 15 150 15 150 mV
Thermal Resistance
Junction to Case 3 3 °C/W
Junction to Ambient 35 35 °C/W
−15 Volt Regulators
Electrical Characteristics
Order Numbers
Metal Can Package
Units
LM120H-15
(TO-39)
LM320H-15
(TO-39)
Design Output Current (ID)0.2A
Device Dissipation (PD)2W
Parameter Conditions (Note 10) Min Typ Max Min Typ Max
Output Voltage TJ = 25°C, VIN = 20V, −15.3 −15 −14.7 −15.4 −15 −14.6 V
ILOAD = 5 mA
Line Regulation TJ = 25°C, ILOAD = 5 mA, 5 10 5 20 mV
VMIN ≤ VIN ≤ VMAX
www.national.com 8
LM120/LM320
Order Numbers
Metal Can Package
Units
LM120H-15
(TO-39)
LM320H-15
(TO-39)
Design Output Current (ID)0.2A
Device Dissipation (PD)2W
Parameter Conditions (Note 10) Min Typ Max Min Typ Max
Input Voltage −35 −17 −35 −17 V
Ripple Rejection f = 120 Hz 56 80 56 80 dB
Load Regulation, TJ = 25°C, VIN = 20V, 10 25 10 40 mV
(Note 11) 5 mA ≤ ILOAD ≤ ID
Output Voltage, 17.5V ≤ VIN ≤ VMAX,−15.5 −14.5 −15.6 −14.4 V
(Note 10) 5 mA ≤ ILOAD ≤ ID, P ≤ PD
Quiescent Current VMIN ≤ VIN ≤ VMAX 2 4 2 4 mA
Quiescent Current TJ = 25°C
Change VMIN ≤ VIN ≤ VMAX 0.05 0.4 0.05 0.4 mA
5 mA ≤ ILOAD ≤ ID 0.03 0.4 0.03 0.4 mA
Output Noise Voltage TA = 25°C, CL = 1 μF, IL = 5 mA, 400 400 μV
VIN = 20V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability 15 150 15 150 mV
Thermal Resistance
Junction to Case (Note 12) (Note 12) °C/W
Junction to Ambient (Note 12) (Note 12) °C/W
−15 Volt Regulators
Electrical Characteristics
Order Numbers
Power Plastic Package
Units
LM320T-15
(TO-220)
Design Output Current (ID)1A
Device Dissipation (PD)15W
Parameter Conditions (Note 10) Min Typ Max
Output Voltage TJ = 25°C, VIN = 20V, −15.5 −15 −14.5 V
ILOAD = 5 mA
Line Regulation TJ = 25°C, ILOAD = 5 mA, 5 20 mV
VMIN ≤ VIN ≤ VMAX
Input Voltage −35 −17.5 V
Ripple Rejection f = 120 Hz 56 80 dB
Load Regulation, TJ = 25°C, VIN = 20V, 30 80 mV
(Note 11) 5 mA ≤ ILOAD ≤ ID
Output Voltage, 17.5V ≤ VIN ≤ VMAX,−15.7 −14.3 V
(Note 10) 5 mA ≤ ILOAD ≤ ID, P ≤ PD
Quiescent Current VMIN ≤ VIN ≤ VMAX 2 4 mA
Quiescent Current TJ = 25°C
Change VMIN ≤ VIN ≤ VMAX 0.1 0.4 mA
5 mA ≤ ILOAD ≤ ID 0.1 0.4 mA
Output Noise Voltage TA = 25°C, CL = 1 μF, IL = 5 mA, 400 μV
VIN = 20V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability 30 mV
9 www.national.com
LM120/LM320
Order Numbers
Power Plastic Package
Units
LM320T-15
(TO-220)
Design Output Current (ID)1A
Device Dissipation (PD)15W
Parameter Conditions (Note 10) Min Typ Max
Thermal Resistance
Junction to Case 4 °C/W
Junction to Ambient 50 °C/W
Note 10: This specification applies over −55°C ≤ TJ ≤ +150°C for the LM120 and 0°C ≤ TJ ≤ +125°C for the LM320.
Note 11: Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects must be taken into account separately. To
ensure constant junction temperature, low duty cycle, pulse testing is used. The LM120/LM320 series does have low thermal feedback, improving line and load
regulation. On all other tests, even though power dissipation is internally limited, electrical specifications apply only up to PD.
Note 12: Thermal resistance of typically 85°C/W (in 400 linear feet/min air flow), 224°C/W (in static air) junction to ambient, of typically 21°C/W junction to case.
Note 13: Refer to RETS120-15H drawing for LM120H-15 or RETS120-15K drawing for LM120K-15 military specifications.
Typical Performance Characteristics
Output Voltage vs
Temperature
776720
Ripple Rejection
(All Types)
776721
Output Impedance TO-3
and TO-220 Packages
776722
Output Impedance TO-5
and TO-202 Packages
776723
www.national.com 10
LM120/LM320
Minimum Input-Output
Differential TO-3 and
TO-220 Packages
776724
Minimum Input-Output
Differential TO-5 and
TO-202 Packages
776725
Quiescent Current vs
Input Voltage
776726
Quiescent Current vs
Load Current
776727
Maximum Average Power
Dissipation (TO-3)
776728
*These curves for LM120. Derate 25°C further for LM320.
Maximum Average Power
Dissipation (TO-5)
776729
Maximum Average Power
Dissipation (TO-202)
776730
Maximum Average Power
Dissipation (TO-220)
776731
11 www.national.com
LM120/LM320
Short Circuit Current
776732
www.national.com 12
LM120/LM320
Typical Applications
High Stability 1 Amp Regulator
776706
Lead and line regulation — 0.01% temperature stability — 0.2%
†Determines Zener current.
††Solid tantalum.
An LM120-12 or LM120-15 may be used to permit higher input voltages, but the regulated output voltage must be at least −15V when using the LM120-12 and
−18V for the LM120-15.
**Select resistors to set output voltage. 2 ppm/°C tracking suggested.
Wide Range Tracking Regulator
776707
*Resistor tolerance of R1 and R2 determine matching of (+) and (−) inputs.
**Necessary only if raw supply capacitors are more than 3″ from regulators
An LM3086N array may substitute for Q1, D1 and D2 for better stability and
tracking. In the array diode transistors Q5 and Q4 (in parallel) make up D2; sim-
ilarly, Q1 and Q2 become D1 and Q3 replaces the 2N2222.
Current Source
776708
Variable Output Current Source
776709
SELECT R2 AS FOLLOWS:
LM120-5 300Ω
LM120-12 750Ω
LM120-15 1k
*C3 optional. Improves transient response and ripple rejection.
13 www.national.com
LM120/LM320
±15V, 1 Amp Tracking Regulators
776712
Performance (Typical)
Load Regulation at ΔIL = 1A 10 mV 1 mV
Output Ripple, CIN = 3000 μF,
IL = 1A
100 μVrms 100 μVrms
Temperature Stability +50 mV +50 mV
Output Noise 10 Hz ≤ f ≤ 10 kHz 150 μVrms 150 μVrms
*Resistor tolerance of R4 and R5 determine matching of (+) and (−) outputs.
**Necessary only if raw supply filter capacitors are more than 2 inches from
regulators.
Light Controllers Using Silicon Photo Cells
776710
*Lamp brightness increases until iI = 5V/R1 (iI can be set as low as 1 μA).
†Necessary only if raw supply filter capacitor is more than 2 inches from
LM320MP.
776711
*Lamp brightness increases until iI =iQ (1 mA) + 5V/R1.
†Necessary only if raw supply filter capacitor is more than 2 inches from LM320.
www.national.com 14
LM120/LM320
Connection Diagrams
776714
Bottom View
Steel Metal Can Package TO-3 (K)
Order Number LM120K-5.0/883, LM120K-12/883,
LM120K-15/883, LM320K-5.0, LM320K-12 or LM320K-15
See NS Package Number K02A
776713
Bottom View
Metal Can Package TO-39 (H)
Order Number LM120H-5.0, LM120H-12, LM120H-15,
LM120H-5.0/883, LM120H-12/883, LM120H-15/883,
LM320H-5.0, LM320H-12 or LM320H-15
See NS Package Number H03A
776717
Front View
Power Package TO-220 (T)
Order Number LM320T-5.0, LM320T-12 or LM320T-15
See NS Package Number T03B
15 www.national.com
LM120/LM320
Schematic Diagrams
−5V
776718
−12V and −15V
776719
www.national.com 16
LM120/LM320
Physical Dimensions inches (millimeters) unless otherwise noted
Metal Can Package (TO-39) (H)
Order Number LM120H-5.0, LM120H-12, LM120H-15, LM320H-5.0, LM320H-12 or LM320H-15
NS Package Number H03A
17 www.national.com
LM120/LM320
Steel Metal Can Package TO-3 (K)
Order Number LM120K-5.0, LM120K-12, LM120K-15, LM320K-5.0, LM320K-12 or LM320K-15
NS Package Number K02A
Power Package TO-220 (T)
Order Number LM320T-5.0, LM320T-12 or LM320T-15
NS Package Number T03B
www.national.com 18
LM120/LM320
Notes
19 www.national.com
LM120/LM320
Notes
LM120/LM320 Series 3-Terminal Negative Regulators
For more National Semiconductor product information and proven design tools, visit the following Web sites at:
Products Design Support
Amplifiers www.national.com/amplifiers WEBENCH www.national.com/webench
Audio www.national.com/audio Analog University www.national.com/AU
Clock Conditioners www.national.com/timing App Notes www.national.com/appnotes
Data Converters www.national.com/adc Distributors www.national.com/contacts
Displays www.national.com/displays Green Compliance www.national.com/quality/green
Ethernet www.national.com/ethernet Packaging www.national.com/packaging
Interface www.national.com/interface Quality and Reliability www.national.com/quality
LVDS www.national.com/lvds Reference Designs www.national.com/refdesigns
Power Management www.national.com/power Feedback www.national.com/feedback
Switching Regulators www.national.com/switchers
LDOs www.national.com/ldo
LED Lighting www.national.com/led
PowerWise www.national.com/powerwise
Serial Digital Interface (SDI) www.national.com/sdi
Temperature Sensors www.national.com/tempsensors
Wireless (PLL/VCO) www.national.com/wireless
THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION
(“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY
OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO
SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS,
IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS
DOCUMENT.
TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT
NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL
PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR
APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND
APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE
NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS.
EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO
LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE
AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR
PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY
RIGHT.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR
SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and
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 to the user. A critical component is any component in 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.
National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other
brand or product names may be trademarks or registered trademarks of their respective holders.
Copyright© 2007 National Semiconductor Corporation
For the most current product information visit us at www.national.com
National Semiconductor
Americas Customer
Support Center
Email:
new.feedback@nsc.com
Tel: 1-800-272-9959
National Semiconductor Europe
Customer Support Center
Fax: +49 (0) 180-530-85-86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +49 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor Asia
Pacific Customer Support Center
Email: ap.support@nsc.com
National Semiconductor Japan
Customer Support Center
Fax: 81-3-5639-7507
Email: jpn.feedback@nsc.com
Tel: 81-3-5639-7560
www.national.com
