LM120H-15 - NATIONAL SEMICONDUCTOR

LM120,LM320

LM120/LM320 Series 3-Terminal Negative Regulators

Literature Number: SNVS756B

LM120/LM320

August 11, 2010

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.

LM120/LM320 Series 3-Terminal Negative Regulators

Absolute Maximum Ratings

−5 Volt Regulators (Note 5, Note 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

LM120K-5.0 and LM320K-5.0 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

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LM120/LM320

LM120H-5.0 Electrical Characteristics (Note 3)

Order Numbers

Metal Can Package

Units

LM120H-5.0

(TO-39)

Design Output Current (ID)

Device Dissipation (PD)

0.5A

Parameter Conditions (Note 1)Min Typ Max

Output Voltage TJ = 25°C, VIN =10V, −5.1 −5 −4.9 V

ILOAD = 5 mA

Line Regulation TJ = 25°C, ILOAD = 5 mA, 10 25 mV

VMIN ≤ VIN ≤ VMAX

Input Voltage −25 −7 V

Ripple Rejection f = 120 Hz 54 64 dB

Load Regulation, TJ = 25°C, VIN = 10V, 30 50 mV

(Note 2)5 mA ≤ ILOAD ≤ ID

Output Voltage, −7.5V ≤ VIN ≤ VMAX,−5.20 −4.80 V

(Note 6)5 mA ≤ ILOAD ≤ ID, P ≤ PD

Quiescent Current VMIN ≤ VIN ≤ VMAX 1 2 mA

Quiescent Current TJ = 25°C

Change VMIN ≤ VIN ≤ VMAX 0.05 0.4 mA

5 mA ≤ ILOAD ≤ ID 0.04 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 5 mV

Thermal Resistance

Junction to Case (Note 4) °C/W

Junction to Ambient (Note 4) °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.

3 www.national.com

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

LM120K-12 Electrical Characteristics

Order Numbers

Metal Can Package

Units

LM120K-12

(TO-3)

Design Output Current (ID)1A

Device Dissipation (PD)20W

Parameter Conditions (Note 6)Min Typ Max

Output Voltage TJ = 25°C, VIN = 17V, −12.3 −12 −11.7 V

ILOAD = 5 mA

Line Regulation TJ = 25°C, ILOAD = 5 mA, 4 10 mV

VMIN ≤ VIN ≤ VMAX

Input Voltage −32 −14 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,−12.5 −11.5 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 12 120 mV

Thermal Resistance

Junction to Case 3 °C/W

Junction to Ambient 35 °C/W

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LM120/LM320

LM120H-12 Electrical Characteristics

Order Numbers

Metal Can Package

Units

LM120H-12

(TO-39)

Design Output Current (ID)0.2A

Device Dissipation (PD)2W

Parameter Conditions (Note 6)Min Typ Max

Output Voltage TJ = 25°C, VIN = 17V, −12.3 −12 −11.7 V

ILOAD = 5 mA

Line Regulation TJ = 25°C, ILOAD = 5 mA, 4 10 mV

VMIN ≤ VIN ≤ VMAX

Input Voltage −32 −14 V

Ripple Rejection f = 120 Hz 56 80 dB

Load Regulation, TJ = 25°C, VIN = 17V, 10 25 mV

(Note 7)5 mA ≤ ILOAD ≤ ID

Output Voltage, 14.5V ≤ VIN ≤ VMAX,−12.5 −11.5 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 0.05 0.4 mA

5 mA ≤ ILOAD ≤ ID 0.03 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 12 120 mV

Thermal Resistance

Junction to Case (Note 8) °C/W

Junction to Ambient (Note 8) °C/W

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LM120/LM320

LM320T-12 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

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.

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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

LM120K-15 and LM320K-15 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

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LM120/LM320

LM120H-15 Electrical Characteristics

Order Numbers

Metal Can Package

Units

LM120H-15

(TO-39)

Design Output Current (ID)0.2A

Device Dissipation (PD)2W

Parameter Conditions (Note 10)Min Typ Max

Output Voltage TJ = 25°C, VIN = 20V, −15.3 −15 −14.7 V

ILOAD = 5 mA

Line Regulation TJ = 25°C, ILOAD = 5 mA, 5 10 mV

VMIN ≤ VIN ≤ VMAX

Input Voltage −35 −17 V

Ripple Rejection f = 120 Hz 56 80 dB

Load Regulation, TJ = 25°C, VIN = 20V, 10 25 mV

(Note 11)5 mA ≤ ILOAD ≤ ID

Output Voltage, 17.5V ≤ VIN ≤ VMAX,−15.5 −14.5 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 0.05 0.4 mA

5 mA ≤ ILOAD ≤ ID 0.03 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 15 150 mV

Thermal Resistance

Junction to Case (Note 12) °C/W

Junction to Ambient (Note 12) °C/W

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LM120/LM320

LM320T-15 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

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.

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LM120/LM320

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

Minimum Input-Output

Differential TO-3 and

TO-220 Packages

776724

Minimum Input-Output

Differential TO-5 and

TO-202 Packages

776725

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LM120/LM320

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

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LM120/LM320

Short Circuit Current

776732

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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; similarly,

Q1 and Q2 become D1 and Q3 replaces the 2N2222.

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LM120/LM320

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.

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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.

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LM120/LM320

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.

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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-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

See NS Package Number H03A

776717

Front View

Power Package TO-220 (T)

Order Number LM320T-12 or LM320T-15

See NS Package Number T03B

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LM120/LM320

Schematic Diagrams

−5V

776718

−12V and −15V

776719

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LM120/LM320

Physical Dimensions inches (millimeters) unless otherwise noted

Metal Can Package (TO-39) (H)

Order Number LM120H-5.0, LM120H-12, LM120H-15

NS Package Number H03A

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LM120/LM320

Steel Metal Can Package TO-3 (K)

Order Number LM120K-5.0, LM120K-12, LM120K-15, LM320K-5.0, LM320K-15

NS Package Number K02A

Power Package TO-220 (T)

Order Number LM320T-12 or LM320T-15

NS Package Number T03B

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LM120/LM320

Notes

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LM120/LM320

Notes

LM120/LM320 Series 3-Terminal Negative Regulators

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