LM120/LM320-N Series 3-Terminal Negative Regulators
Check for Samples: LM120, LM320-N
1
FEATURES
2
•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
DESCRIPTION
The LM120series are three-terminalnegative
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
compensation capacitor at the output, making them
easy to apply. Worst case specifications on output
voltage deviation due to any combination of line, load
or temperature variation assure satisfactory system
operation.
SNVS756C –APRIL 1998–REVISED APRIL 2013
Exceptional effort has been made to make the LM120
Series immune to overload conditions. The regulators
have current limiting which is independent of
temperature,combinedwiththermaloverload
protection. Internal current limiting protects against
momentary faults while thermal shutdown prevents
junction temperatures from exceeding safe limits
during prolonged overloads.
Although primarily intended for fixed output voltage
applications, the LM120 Series may be programmed
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
regulation.
Table 1. LM120 Series Packages and Power
Capability
DevicePackageRated PowerDesign
DissipationLoad
Current
LM120/LM320-TO-3 (NDS)20W1.5A
N
TO (NDT)2W0.5A
LM320-NTO-220 (NDE)15W1.5A
Typical Applications
Figure 1. Dual Trimmed Supply
1
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.
*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.
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.
ABSOLUTE MAXIMUM RATINGS−5 VOLT REGULATORS
(1)(2)(3)
Power DissipationInternally Limited
Input Voltage−25V
Input-Output Voltage Differential25V
Junction Temperatures
Storage Temperature Range−65°C to +150°C
Lead Temperature
(Soldering, 10 sec.)300°C
Plastic260°C
(1) Refer to RETS120-5H drawing for LM120H-5.0 or RETS120-5K drawing for LM120-5K military specifications.
(2) For −5V 3 amp regulators, see LM145 data sheet.
(3) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(4) This specification applies over −55°C ≤ TJ≤ +150°C for the LM120 and 0°C ≤ TJ≤ +125°C for the LM320-N.
LM120K-5.0 AND LM320K-5.0 ELECTRICAL CHARACTERISTICS
VIN= 10V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability550550mV
Thermal Resistance
Junction to Case33°C/W
Junction to Ambient3535°C/W
(1) For −5V 3 amp regulators, see LM145 data sheet.
(2) This specification applies over −55°C ≤ TJ≤ +150°C for the LM120 and 0°C ≤ TJ≤ +125°C for the LM320-N.
(3) 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-N 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.
VIN= 10V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability5mV
Thermal Resistance
Junction to Case
Junction to Ambient
(5)
(5)
°C/W
°C/W
(1) For −5V 3 amp regulators, see LM145 data sheet.
(2) This specification applies over −55°C ≤ TJ≤ +150°C for the LM120 and 0°C ≤ TJ≤ +125°C for the LM320-N.
(3) 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-N 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.
(4) This specification applies over −55°C ≤ TJ≤ +150°C for the LM120 and 0°C ≤ TJ≤ +125°C for the LM320-N.
(5) 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.
ABSOLUTE MAXIMUM RATINGS−12 VOLT REGULATORS
(1)(2)
Power DissipationInternally Limited
Input Voltage−35V
Input-Output Voltage Differential30V
Junction Temperatures
(3)
Storage Temperature Range−65°C to +150°C
Lead Temperature
(Soldering, 10 sec.)300°C
(1) Refer to RETS120H-12 drawing for LM120H-12 or RETS120-12K drawing for LM120K-12 military specifications.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) This specification applies over −55°C ≤ TJ≤ +150°C for the LM120 and 0°C ≤ TJ≤ +125°C for the LM320-N.
VIN= 17V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability12120mV
Thermal Resistance
Junction to Case3°C/W
Junction to Ambient35°C/W
(1) This specification applies over −55°C ≤ TJ≤ +150°C for the LM120 and 0°C ≤ TJ≤ +125°C for the LM320-N.
(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-N 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.
(3) This specification applies over −55°C ≤ TJ≤ +150°C for the LM120 and 0°C ≤ TJ≤ +125°C for the LM320-N.
VIN= 17V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability12120mV
Thermal Resistance
Junction to Case
Junction to Ambient
(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-N 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.
(3) 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
(1) This specification applies over −55°C ≤ TJ≤ +150°C for the LM120 and 0°C ≤ TJ≤ +125°C for the LM320-N.
(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-N 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.
VIN= 17V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability24mV
Thermal Resistance
Junction to Case4°C/W
Junction to Ambient50°C/W
ABSOLUTE MAXIMUM RATINGS−15 VOLT REGULATORS
(1)(2)
Power DissipationInternally Limited
Input Voltage
LM120/LM320-N−40V
LM320T−35V
Input-Output Voltage Differential30V
Junction Temperatures
Storage Temperature Range−65°C to +150°C
Lead Temperature
(Soldering, 10 sec.)300°C
(1) Refer to RETS120-15H drawing for LM120H-15 or RETS120-15K drawing for LM120K-15 military specifications.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) This specification applies over −55°C ≤ TJ≤ +150°C for the LM120 and 0°C ≤ TJ≤ +125°C for the LM320-N.
LM320T-12
(TO-220)
Units
(3)
LM120K-15 AND LM320K-15 ELECTRICAL CHARACTERISTICS
(1) This specification applies over −55°C ≤ TJ≤ +150°C for the LM120 and 0°C ≤ TJ≤ +125°C for the LM320-N.
(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-N 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.
VIN= 20V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability15150mV
Thermal Resistance
Junction to Case
Junction to Ambient
(1) This specification applies over −55°C ≤ TJ≤ +150°C for the LM120 and 0°C ≤ TJ≤ +125°C for the LM320-N.
(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-N 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.
(3) 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
VIN= 20V, 10 Hz ≤ f ≤ 100 kHz
Long Term Stability30mV
Thermal Resistance
Junction to Case4°C/W
Junction to Ambient50°C/W
LM320T-15
(TO-220)
Units
24mA
0.10.4mA
0.10.4mA
(1) This specification applies over −55°C ≤ TJ≤ +150°C for the LM120 and 0°C ≤ TJ≤ +125°C for the LM320-N.
(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-N 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.
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.
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TYPICAL APPLICATIONS
Figure 16. High Stability 1 Amp Regulator
*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.
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.
IL= 1A
Temperature Stability+50 mV+50 mV
Output Noise 10 Hz ≤ f ≤ 10 kHz150 μVrms150 μVrms
100 μVrms100 μVrms
Light Controllers Using Silicon Photo Cells
*Lamp brightness increases until iI= 5V/R1 (iIcan be set as low as 1 μA).
†Necessary only if raw supply filter capacitor is more than 2 inches from LM320MP.
Changes from Revision B (April 2013) to Revision CPage
•Changed layout of National Data Sheet to TI format .......................................................................................................... 16
LM120H-12ACTIVETONDT3500RoHS & GreenAULevel-1-NA-UNLIM-55 to 150( LM120H-12P+, LM1
LM120H-12/NOPBACTIVETONDT3500RoHS & GreenAULevel-1-NA-UNLIM-55 to 150( LM120H-12P+, LM1
LM120H-15ACTIVETONDT3500RoHS & GreenAULevel-1-NA-UNLIM-55 to 150( LM120H-15P+, LM1
LM120H-15/NOPBACTIVETONDT3500RoHS & GreenAULevel-1-NA-UNLIM-55 to 150( LM120H-15P+, LM1
LM120H-5.0ACTIVETONDT3500RoHS & GreenAULevel-1-NA-UNLIM-55 to 150( LM120H-5.0P+, LM
LM120H-5.0/NOPBACTIVETONDT3500RoHS & GreenAULevel-1-NA-UNLIM-55 to 150( LM120H-5.0P+, LM
LM320T-15NRNDTO-220NDE345Non-RoHS
LM320T-15/NOPBACTIVETO-220NDE345RoHS & GreenSNLevel-1-NA-UNLIM0 to 125LM320T
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
Package Type Package
(1)
Drawing
Pins Package
Qty
Eco Plan
(2)
& Green
Lead finish/
Ball material
(6)
Call TILevel-1-NA-UNLIM0 to 125LM320T
MSL Peak Temp
(3)
Op Temp (°C)Device Marking
(4/5)
20H-12P+)
20H-12P+)
20H-15P+)
20H-15P+)
120H-5.0P+)
120H-5.0P+)
-15 P+
-15 P+
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
Samples
Addendum-Page 1
Page 19
PACKAGE OPTION ADDENDUM
www.ti.com
30-Sep-2021
(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.
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
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Addendum-Page 2
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PACKAGE MATERIALS INFORMATION
www.ti.com5-Jan-2022
TUBE
*All dimensions are nominal
DevicePackage Name Package TypePinsSPQL (mm)W (mm)T (µm)B (mm)
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