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LM150/LM350A/LM350 3-Amp Adjustable Regulators
Check for Samples: LM150,LM350-N,LM350A
In addition to higher performance than fixed
1FEATURES regulators, the LM150 series offers full overload
2• Adjustable Output Down to 1.2V protection available only in IC's. Included on the chip
• Guaranteed 3A output Current are current limit, thermal overload protection and safe
area protection. All overload protection circuitry
• Guaranteed Thermal Regulation remains fully functional even if the adjustment
• Output is Short Circuit Protected terminal is accidentally disconnected.
• Current Limit Constant with Temperature Normally, no capacitors are needed unless the device
• P+Product Enhancement Tested is situated more than 6 inches from the input filter
• 86 dB Ripple Rejection capacitors in which case an input bypass is needed.
An output capacitor can be added to improve
• Ensured 1% Output Voltage Tolerance transient response, while bypassing the adjustment
(LM350A) pin will increase the regulator's ripple rejection.
• Ensured Max. 0.01%/V Line Regulation Besides replacing fixed regulators or discrete
(LM350A) designs, the LM150 is useful in a wide variety of
• Ensured Max. 0.3% Load Regulation (LM350A) other applications. Since the regulator is “floating”
and sees only the input-to-output differential voltage,
APPLICATIONS supplies of several hundred volts can be regulated as
long as the maximum input to output differential is not
• Adjustable Power supplies exceeded, i.e., avoid short-circuiting the output.
• Constant Current Regulators By connecting a fixed resistor between the
• Battery Chargers adjustment pin and output, the LM150 can be used
as a precision current regulator. Supplies with
DESCRIPTION electronic shutdown can be achieved by clamping the
The LM150 series of adjustable 3-terminal positive adjustment terminal to ground which programs the
voltage regulators is capable of supplying in excess output to 1.2V where most loads draw little current.
of 3A over a 1.2V to 33V output range. They are The part numbers in the LM150 series which have a
exceptionally easy to use and require only 2 external NDS suffix are packaged in a standard Steel TO-3
resistors to set the output voltage. Further, both line package, while those with a NDE suffix are packaged
and load regulation are comparable to discrete in a TO-220 plastic package. The LM150 is rated for
designs. Also, the LM150 is packaged in standard −55°C ≤TJ≤+150°C, while the LM350A is rated for
transistor packages which are easily mounted and −40°C ≤TJ≤+125°C, and the LM350 is rated for 0°C
handled. ≤TJ≤+125°C.
Connection Diagram
Case is Output
Figure 1. (TO-3 STEEL) Metal Can Package Figure 2. (TO-220) Plastic Package
Bottom View Front View
See Package Number NDS0002A See Package Number NDE0003B
1Please 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. Copyright © 1998–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
LM150, LM350-N, LM350A
SNVS772B –MAY 1998–REVISED MARCH 2013
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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(1)(2)(3)
Power Dissipation Internally Limited
Input-Output Voltage Differential +35V
Storage Temperature −65°C to +150°C
Metal Package (Soldering, 10 sec.) 300°C
Lead Temperature Plastic Package (Soldering, 4 sec.) 260°C
ESD Tolerance TBD
LM150 −55°C ≤TJ≤+150°C
Operating Temperature Range LM350A −40°C ≤TJ≤+125°C
LM350 0°C ≤TJ≤+125°C
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test
conditions, see the Electrical Characteristics.
(2) Refer to RETS150K drawing for military specifications of the LM150K.
(3) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
Electrical Characteristics
Specifications with standard type face are for TJ= 25°C, and those with boldface type apply over full Operating
Temperature Range. Unless otherwise specified, VIN−VOUT= 5V, and IOUT= 10 mA(1)
Parameter Conditions LM150 Units
Min Typ Max
Reference Voltage 3V ≤(VIN −VOUT)≤35V, 10 mA ≤IOUT ≤3A, P ≤30W 1.20 1.25 1.30 V
0.005 0.01 %/V
Line Regulation 3V ≤(VIN −VOUT)≤35V(2) 0.02 0.05 %/V
0.1 0.3 %
Load Regulation 10 mA ≤IOUT ≤3A(2) 0.3 1 %
Thermal Regulation 20 ms Pulse 0.002 0.01 %/W
Adjustment Pin Current 50 100 μA
Adjustment Pin Current Change 10 mA ≤IOUT ≤3A, 3V ≤(VIN −VOUT)≤35V 0.2 5 μA
Temperature Stability TMIN ≤TJ≤TMAX 1%
Minimum Load Current VIN −VOUT = 35V 3.5 5 mA
VIN −VOUT ≤10V 3.0 4.5 A
Current Limit VIN −VOUT = 30V 0.3 1 A
RMS Output Noise, % of VOUT 10 Hz ≤f≤10 kHz 0.001 %
VOUT = 10V, f = 120 Hz, CADJ = 0 μF65 dB
Ripple Rejection Ratio VOUT = 10V, f = 120 Hz, CADJ = 10 μF66 86 dB
Long-Term Stability TJ= 125°C, 1000 hrs 0.3 1 %
Thermal Resistance, Junction to Case NDS Package 1.2 1.5 °C/W
Thermal Resistance, Junction to NDS Package 35 °C/W
Ambient (No Heat Sink)
(1) These specifications are applicable for power dissipations up to 30W for the TO-3 (NDS) package and 25W for the TO-220 (NDE)
package. Power dissipation is ensured at these values up to 15V input-output differential. Above 15V differential, power dissipation will
be limited by internal protection circuitry. All limits (i.e., the numbers in the Min. and Max. columns) are ensured to AOQL (Average
Outgoing Quality Level).
(2) Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to
heating effects are covered under the specifications for thermal regulation.
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Electrical Characteristics
Specifications with standard type face are for TJ= 25°C, and those with boldface type apply over full Operating
Temperature Range. Unless otherwise specified, VIN −VOUT = 5V, and IOUT = 10 mA.(1)
LM350A LM350 Units
Parameter Conditions Min Typ Max Min Typ Max
IOUT = 10 mA, TJ= 25°C 1.238 1.250 1.262 V
Reference Voltage 3V ≤(VIN −VOUT)≤35V, 1.225 1.250 1.270 1.20 1.25 1.30 V
10 mA ≤IOUT ≤3A, P ≤30W 0.005 0.01 0.005 0.03 %/V
Line Regulation 3V ≤(VIN −VOUT)≤35V(2) 0.02 0.05 0.02 0.07 %/V
0.1 0.3 0.1 0.5 %
Load Regulation 10 mA ≤IOUT ≤3A(2) 0.3 1 0.3 1.5 %
Thermal Regulation 20 ms Pulse 0.002 0.01 0.002 0.03 %/W
Adjustment Pin Current 50 100 50 100 μA
Adjustment Pin Current Change 10 mA ≤IOUT ≤3A, 3V ≤(VIN −VOUT)≤35V 0.2 5 0.2 5 μA
Temperature Stability TMIN ≤TJ≤TMAX 1 1 %
Minimum Load Current VIN −VOUT = 35V 3.5 10 3.5 10 mA
VIN −VOUT ≤10V 3.0 4.5 3.0 4.5 A
Current Limit VIN −VOUT = 30V 0.3 1 0.25 1 A
RMS Output Noise, % of VOUT 10 Hz ≤f≤10 kHz 0.001 0.001 %
VOUT = 10V, f = 120 Hz, CADJ = 0 μF65 65 dB
Ripple Rejection Ratio VOUT = 10V, f = 120 Hz, CADJ = 10 μF66 86 66 86 dB
Long-Term Stability TJ= 125°C, 1000 hrs 0.25 1 0.25 1 %
NDS Package 1.2 1.5 °C/W
Thermal Resistance, Junction to
Case NDE Package 3 4 3 4 °C/W
NDS Package 35 °C/W
Thermal Resistance, Junction to
Ambient (No Heat Sink) NDE Package 50 50 °C/W
(1) These specifications are applicable for power dissipations up to 30W for the TO-3 (NDS) package and 25W for the TO-220 (NDE)
package. Power dissipation is ensured at these values up to 15V input-output differential. Above 15V differential, power dissipation will
be limited by internal protection circuitry. All limits (i.e., the numbers in the Min. and Max. columns) are ensured to AOQL (Average
Outgoing Quality Level).
(2) Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to
heating effects are covered under the specifications for thermal regulation.
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Typical Performance Characteristics
Load Regulation Current Limit
Figure 3. Figure 4.
Adjustment Current Dropout Voltage
Figure 5. Figure 6.
Temperature Stability Minimum Operating Current
Figure 7. Figure 8.
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Typical Performance Characteristics (continued)
Ripple Rejection Ripple Rejection
Figure 9. Figure 10.
Ripple Rejection Output Impedance
Figure 11. Figure 12.
Line Transient Response Load Transient Response
Figure 13. Figure 14.
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APPLICATION HINTS
In operation, the LM150 develops a nominal 1.25V reference voltage, VREF, between the output and adjustment
terminal. The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a
constant current I1then flows through the output set resistor R2, giving an output voltage of
(1)
Figure 15.
Since the 50 μA current from the adjustment terminal represents an error term, the LM150 was designed to
minimize IADJ and make it very constant with line and load changes. To do this, all quiescent operating current is
returned to the output establishing a minimum load current requirement. If there is insufficient load on the output,
the output will rise.
EXTERNAL CAPACITORS
An input bypass capacitor is recommended. A 0.1 μF disc or 1 μF solid tantalum on the input is suitable input
bypassing for almost all applications. The device is more sensitive to the absence of input bypassing when
adjustment or output capacitors are used but the above values will eliminate the possibility of problems.
The adjustment terminal can be bypassed to ground on the LM150 to improve ripple rejection. This bypass
capacitor prevents ripple from being amplified as the output voltage is increased. With a 10 μF bypass capacitor
86 dB ripple rejection is obtainable at any output level. Increases over 10 μF do not appreciably improve the
ripple rejection at frequencies above 120 Hz. If the bypass capacitor is used, it is sometimes necessary to
include protection diodes to prevent the capacitor from discharging through internal low current paths and
damaging the device.
In general, the best type of capacitors to use is solid tantalum. Solid tantalum capacitors have low impedance
even at high frequencies. Depending upon capacitor construction, it takes about 25 μF in aluminum electrolytic to
equal 1 μF solid tantalum at high frequencies. Ceramic capacitors are also good at high frequencies, but some
types have a large decrease in capacitance at frequencies around 0.5 MHz. For this reason, 0.01 μF disc may
seem to work better than a 0.1 μF disc as a bypass.
Although the LM150 is stable with no output capacitors, like any feedback circuit, certain values of external
capacitance can cause excessive ringing. This occurs with values between 500 pF and 5000 pF. A 1 μF solid
tantalum (or 25 μF aluminum electrolytic) on the output swamps this effect and insures stability.
LOAD REGULATION
The LM150 is capable of providing extremely good load regulation but a few precautions are needed to obtain
maximum performance. The current set resistor connected between the adjustment terminal and the output
terminal (usually 240Ω) should be tied directly to the output (case) of the regulator rather than near the load. This
eliminates line drops from appearing effectively in series with the reference and degrading regulation. For
example, a 15V regulator with 0.05Ωresistance between the regulator and load will have a load regulation due to
line resistance of 0.05Ω× IOUT. If the set resistor is connected near the load the effective line resistance will be
0.05Ω(1 + R2/R1) or in this case, 11.5 times worse.
Figure 16 shows the effect of resistance between the regulator and 240Ωset resistor.
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Figure 16. Regulator with Line Resistance
in Output Lead
With the TO-3 package, it is easy to minimize the resistance from the case to the set resistor, by using two
separate leads to the case. The ground of R2 can be returned near the ground of the load to provide remote
ground sensing and improve load regulation.
PROTECTION DIODES
When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to
prevent the capacitors from discharging through low current points into the regulator. Most 10 μF capacitors have
low enough internal series resistance to deliver 20A spikes when shorted. Although the surge is short, there is
enough energy to damage parts of the IC.
When an output capacitor is connected to a regulator and the input is shorted, the output capacitor will discharge
into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage
of the regulator, and the rate of decrease of VIN. In the LM150, this discharge path is through a large junction that
is able to sustain 25A surge with no problem. This is not true of other types of positive regulators. For output
capacitors of 25 μF or less, there is no need to use diodes.
The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs
when either the input or output is shorted. Internal to the LM150 is a 50Ωresistor which limits the peak discharge
current. No protection is needed for output voltages of 25V or less and 10 μF capacitance. Figure 17 shows an
LM150 with protection diodes included for use with outputs greater than 25V and high values of output
capacitance.
D1 protects against C1
D2 protects against C2
Figure 17. Regulator with Protection Diodes
(2)
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Schematic Diagram
Figure 18. Schematic Diagram
Typical Applications
Full output current not available
at high input-output voltages.
†Optional—improves transient response. Output capacitors in the range of 1 μF to 1000 μF of aluminum or tantalum
electrolytic are commonly used to provide improved output impedance and rejection of transients.
*Needed if device is more than 6 inches from filter capacitors.
Figure 19. 1.2V–25V Adjustable Regulator
Note: Usually R1 = 240Ωfor LM150 and R1 = 120Ωfor LM350. (3)
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*Adjust for 3.75V across R1
Figure 20. Precision Power Regulator with Low Temperature Coefficient
Figure 21. Slow Turn-ON 15V Regulator
†Solid tantalum
*Discharges C1 if output is shorted to ground
Figure 22. Adjustable Regulator with Improved Ripple Rejection
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Figure 23. High Stability 10V Regulator
*Sets maximum VOUT
Figure 24. Digitally Selected Outputs
Figure 25. Regulator and Voltage Reference
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*Minimum load current 50 mA
Figure 26. 10A Regulator
*Min output ≈1.2V
Figure 27. 5V Logic Regulator with Electronic Shutdown*
Full output current not available at high input-output voltages
Figure 28. 0 to 30V Regulator
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†Solid tantalum
*Lights in constant current mode
Figure 29. 5A Constant Voltage/Constant Current Regulator
Figure 30. 12V Battery Charger
*0.4 ≤R1≤120Ω
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Figure 31. Adjustable Current Regulator Figure 32. Precision Current Limiter
*Minimum output current ≈4 mA
Figure 33. 1.2V–20V Regulator with Minimum Figure 34. 3A Current Regulator
Program Current
Figure 35. Tracking Preregulator
†Minimum load—10 mA
*All outputs within ±100 mV
Figure 36. Adjusting Multiple On-Card Regulators with Single Control*
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Use of RSallows low charging rates with fully charged battery.
**1000 μF is recommended to filter out any input transients
Figure 37. AC Voltage Regulator Figure 38. Simple 12V Battery Charger
Figure 39. Temperature Controller Figure 40. Light Controller
*Sets peak current (2A for 0.3Ω)
**1000 μF is recommended to filter out any input transients.
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REVISION HISTORY
Changes from Revision A (March 2013) to Revision B Page
• Changed layout of National Data Sheet to TI format .......................................................................................................... 15
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PACKAGE OPTION ADDENDUM
www.ti.com 28-Jun-2017
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM350A MWC ACTIVE WAFERSALE YS 0 1 Green (RoHS
& no Sb/Br) Call TI Level-1-NA-UNLIM -40 to 85
LM350AT NRND TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM350AT
P+
LM350AT/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM350AT
P+
LM350K STEEL ACTIVE TO-3 NDS 2 50 TBD Call TI Call TI 0 to 0 LM350K
STEELP+
LM350K STEEL/NOPB ACTIVE TO-3 NDS 2 50 Green (RoHS
& no Sb/Br) Call TI Level-1-NA-UNLIM 0 to 0 LM350K
STEELP+
LM350T NRND TO-220 NDE 3 45 TBD Call TI Call TI 0 to 125 LM350T P+
LM350T/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br) CU SN Level-1-NA-UNLIM 0 to 125 LM350T P+
(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.
(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.
(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.
PACKAGE OPTION ADDENDUM
www.ti.com 28-Jun-2017
Addendum-Page 2
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish 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.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
MECHANICAL DATA
NDS0002A
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MECHANICAL DATA
NDE0003B
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