Datasheet

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LM120, LM320-N

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SNVS756C –APRIL 1998–REVISED APRIL 2013

LM120/LM320-N Series 3-Terminal Negative Regulators

Check for Samples: LM120, LM320-N

Exceptional effort has been made to make the LM120

FEATURES

Series immune to overload conditions. The regulators

• Preset Output Voltage Error Less than ±3%

have current limiting which is independent of

• Preset Current Limit

temperature, combined with thermal overload

protection. Internal current limiting protects against

• Internal Thermal Shutdown

momentary faults while thermal shutdown prevents

• Operates with Input-Output Voltage Differential

junction temperatures from exceeding safe limits

down to 1V

during prolonged overloads.

• Excellent Ripple Rejection

Although primarily intended for fixed output voltage

• Low Temperature Drift

applications, the LM120 Series may be programmed

• Easily Adjustable to Higher Output Voltage

for higher output voltages with a simple resistive

divider. The low quiescent drain current of the

devices allows this technique to be used with good

DESCRIPTION

regulation.

The LM120 series are three-terminal negative

regulators with a fixed output voltage of −5V, −12V,

Table 1. LM120 Series Packages and Power

and −15V, and up to 1.5A load current capability.

Capability

Where other voltages are required, the LM137 and

Device Package Rated Power Design

LM137HV series provide an output voltage range of

Dissipation Load

−1.2V to −47V.

Current

The LM120 need only one external component—a

LM120/LM320- TO-3 (NDS) 20W 1.5A

compensation capacitor at the output, making them

easy to apply. Worst case specifications on output

TO (NDT) 2W 0.5A

voltage deviation due to any combination of line, load

LM320-N TO-220 (NDE) 15W 1.5A

or temperature variation assure satisfactory system

operation.

Typical Applications

*Required if regulator is separated from

filter capacitor by more than 3 inches. 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.

Figure 1. Dual Trimmed Supply

Figure 2. Fixed Regulator

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (22 pages)

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LM120, LM320-N www.ti.
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LM120, LM320-N SNVS756C – APRIL 1998 – REVISED APRIL 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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LM120, LM320-N www.ti.com SNVS756C – APRIL 1998 – REVISED APRIL 2013 LM120H-5.0 ELECTRICAL CHARACTERISTICS (1) Metal Can Package Order Numbers LM120H-5.0 (TO) Design Output Current (ID) Device Dissipation (PD) 0.5A 2W Parameter Output Voltage Conditions (2) Units Min Typ Max −5.1 −5 −4.9 V 10 25 mV −7 V 50 mV −4.80 V 1 2 mA VMIN ≤ VIN ≤ VMAX 0.05 0.4 mA 5 mA ≤ ILOAD ≤ ID 0.04 0.
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LM120, LM320-N SNVS756C – APRIL 1998 – REVISED APRIL 2013 www.ti.com LM120K-12 ELECTRICAL CHARACTERISTICS Metal Can Package Order Numbers LM120K-12 (TO-3) Design Output Current (ID) 1A Device Dissipation (PD) Parameter Output Voltage Units 20W Conditions (1) TJ = 25°C, VIN = 17V, Min Typ Max −12.3 −12 −11.
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LM120, LM320-N www.ti.com SNVS756C – APRIL 1998 – REVISED APRIL 2013 LM120H-12 ELECTRICAL CHARACTERISTICS (continued) Metal Can Package Order Numbers LM120H-12 (TO) Design Output Current (ID) 0.2A Device Dissipation (PD) Parameter (2) Units 2W Conditions (1) Min Typ Max 5 mA ≤ ILOAD ≤ ID Output Voltage, (1) 14.5V ≤ VIN ≤ VMAX, −12.5 −11.5 V 2 4 mA 5 mA ≤ ILOAD ≤ ID, P ≤ PD Quiescent Current VMIN ≤ VIN ≤ VMAX Quiescent Current TJ = 25°C Change VMIN ≤ VIN ≤ VMAX 0.05 0.
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LM120, LM320-N SNVS756C – APRIL 1998 – REVISED APRIL 2013 www.ti.
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LM120, LM320-N www.ti.com SNVS756C – APRIL 1998 – REVISED APRIL 2013 LM120K-15 AND LM320K-15 ELECTRICAL CHARACTERISTICS (continued) Metal Can Package Order Numbers LM120K-15 (TO-3) LM320K-15 (TO-3) Design Output Current (ID) Device Dissipation (PD) Parameter 20W Conditions (1) Min Typ Max Quiescent Current TJ = 25°C Change VMIN ≤ VIN ≤ VMAX 0.1 5 mA ≤ ILOAD ≤ ID 0.1 TA = 25°C, CL = 1 μF, IL = 5 mA, 400 Output Noise Voltage Units 1A Min Typ Max 0.4 0.1 0.4 mA 0.4 0.1 0.
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LM120, LM320-N SNVS756C – APRIL 1998 – REVISED APRIL 2013 www.ti.com LM320T-15 ELECTRICAL CHARACTERISTICS Power Plastic Package Order Numbers LM320T-15 (TO-220) Design Output Current (ID) 1A Device Dissipation (PD) Parameter Output Voltage Conditions Units 15W (1) TJ = 25°C, VIN = 20V, Min Typ Max −15.5 −15 −14.
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LM120, LM320-N www.ti.com SNVS756C – APRIL 1998 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage vs Temperature Ripple Rejection (All Types) Figure 3. Figure 4. Output Impedance TO-3 and TO-220 Packages Output Impedance TO-5 and TO-202 Packages Figure 5. Figure 6. Minimum Input-Output Differential TO-3 and TO-220 Packages Minimum Input-Output Differential TO-5 and TO-202 Packages Figure 7. Figure 8.
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LM120, LM320-N SNVS756C – APRIL 1998 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Quiescent Current vs Input Voltage Quiescent Current vs Load Current Figure 9. Figure 10. Maximum Average Power Dissipation (TO-3) Maximum Average Power Dissipation (TO-5) *These curves for LM120. Derate 25°C further for LM320-N. Figure 11. 10 Figure 12. Maximum Average Power Dissipation (TO-202) Maximum Average Power Dissipation (TO-220) Figure 13. Figure 14.
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LM120, LM320-N www.ti.com SNVS756C – APRIL 1998 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Short Circuit Current Figure 15.
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LM120, LM320-N SNVS756C – APRIL 1998 – REVISED APRIL 2013 www.ti.com TYPICAL APPLICATIONS 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. Figure 16.
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LM120, LM320-N www.ti.com SNVS756C – APRIL 1998 – REVISED APRIL 2013 Figure 18. Current Source SELECT R2 AS FOLLOWS: LM120-5 300Ω LM120-12 750Ω LM120-15 1k *C3 optional. Improves transient response and ripple rejection. Figure 19.
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LM120, LM320-N SNVS756C – APRIL 1998 – REVISED APRIL 2013 www.ti.com See Performance (Typical) *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. Figure 20.
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LM120, LM320-N www.ti.com SNVS756C – APRIL 1998 – REVISED APRIL 2013 *Lamp brightness increases until iI =iQ (1 mA) + 5V/R1. †Necessary only if raw supply filter capacitor is more than 2 inches from LM320-N. Connection Diagram Figure 21. Steel Metal Can Package TO-3 (NDS) (Bottom View) Figure 22. Metal Can Package TO (NDT) (Bottom View) Figure 23.
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LM120, LM320-N SNVS756C – APRIL 1998 – REVISED APRIL 2013 www.ti.com Schematic Diagrams Figure 24. −5V Figure 25.
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LM120, LM320-N www.ti.com SNVS756C – APRIL 1998 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision B (April 2013) to Revision C • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com (4) 1-Nov-2013 There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device.
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MECHANICAL DATA NDT0003A H03A (Rev D) www.ti.
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MECHANICAL DATA NDE0003B www.ti.
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