Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
LM2990
SNVS093G –JUNE 1999–REVISED MAY 2015
LM2990 Negative Low-Dropout Regulator
1 Features 3 Description
The LM2990 is a three-terminal, low-dropout, 1-A
1• Input Voltage: –26 V to –6 V negative voltage regulator available with fixed output
• Fixed Output Voltages: −5 V, −5.2 V, −12 V, and voltages of −5 V, −5.2 V, −12 V, and −15 V.
−15 V The LM2990 uses circuit design techniques to
• 5% Output Accuracy over Entire Operating Range provide low-dropout and low-quiescent current. The
• Output Current in Excess of 1 A dropout voltage at 1-A load current is typically 0.6 V
• Dropout Voltage Typically 0.6 V at 1-A Load and an ensured worst-case maximum of 1 V over the
entire operating temperature range. The quiescent
• Low Quiescent Current current is typically 1 mA with 1-A load current and an
• Internal Short-Circuit Current Limit input-output voltage differential greater than 3 V. A
• Internal Thermal Shutdown with Hysteresis unique circuit design of the internal bias supply limits
the quiescent current to only 9 mA (typical) when the
• Functional Complement to the LM2940 Series regulator is in the dropout mode (VOUT −VIN ≤3 V).
Output voltage accuracy is ensured to ±5% over load
2 Applications and temperature extremes.
• Post Switcher Regulator The LM2990 also implements short-circuit proof, and
• Local, On-Card Regulation thermal shutdown includes hysteresis to enhance the
• Battery Operated Equipment reliability of the device when overloaded for an
extended period of time.
space
space All these features make the LM2990 an ideal
negative power supply suited for dual supply
space systems. The device may also be used as fixed or
adjustable current sink load.
Typical Application The LM2990 is available in two 3-pin packages and is
rated for operation over the junction temperature
range of −40°C to 125°C.
Device Information(1)
* and **: Required for stability. Must be at PART NUMBER PACKAGE BODY SIZE (NOM)
least a 10-μF aluminum electrolytic or a 1- DDPAK/TO-263 (3) 10.20 mm x 9.00 mm
μF solid tantalum to maintain stability. May LM2990 TO-220 (3) 14.99 mm x 10.16 mm
be increased without bound to maintain
regulation during transients. Locate the (1) For all available packages, see the orderable addendum at
capacitor as close as possible to the the end of the datasheet.
regulator. The equivalent series resistance
(ESR) is critical, and should be less than
10 Ωover the same operating temperature
range as the regulator.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM2990
SNVS093G –JUNE 1999–REVISED MAY 2015
www.ti.com
Table of Contents
7.3 Feature Description................................................. 10
1 Features.................................................................. 17.4 Device Functional Modes........................................ 11
2 Applications ........................................................... 18 Application and Implementation ........................ 12
3 Description............................................................. 18.1 Application Information............................................ 12
4 Revision History..................................................... 28.2 Typical Application ................................................. 12
5 Pin Configuration and Functions......................... 39 Power Supply Recommendations...................... 14
6 Specifications......................................................... 410 Layout................................................................... 15
6.1 Absolute Maximum Ratings ...................................... 410.1 Layout Guidelines ................................................. 15
6.2 ESD Ratings.............................................................. 410.2 Layout Example .................................................... 15
6.3 Recommended Operating Conditions....................... 411 Device and Documentation Support................. 16
6.4 Thermal Information.................................................. 411.1 Device Support .................................................... 16
6.5 Electrical Characteristics: –5 V and –5.2 V............... 511.2 Trademarks........................................................... 16
6.6 Electrical Characteristics: –12 V and –15 V.............. 611.3 Electrostatic Discharge Caution............................ 16
6.7 Typical Characteristics.............................................. 611.4 Glossary................................................................ 16
7 Detailed Description............................................ 10 12 Mechanical, Packaging, and Orderable
7.1 Overview................................................................. 10 Information........................................................... 16
7.2 Functional Block Diagram....................................... 10
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision F (February 2015) to Revision G Page
• Changed "Ground" to "INPUT" in center of layout drawing ................................................................................................. 15
Changes from Revision E (November 2014) to Revision F Page
• Changed word "automotive" to "junction"; update pin names to TI nomenclature ................................................................ 1
• Changed Handling Ratings to ESD Ratings table; moved Storage temperature to Ab Max.................................................. 4
• Changed wording of first sentence of Low Dropout Voltage section .................................................................................. 10
• Changed wording of first sentence of Application Information section ................................................................................ 12
• Added IOUT = 5 mA to "RMS noise" and "PSRR" rows......................................................................................................... 12
Changes from Revision D (April 2013) to Revision E Page
• Added Device Information and Handling Rating tables, Feature Description,Device Functional Modes,Application
and Implementation,Power Supply Recommendations,Layout,Device and Documentation Support, and
Mechanical, Packaging, and Orderable Information sections; moved some curves to Application Curves section;
update new thermal values..................................................................................................................................................... 1
2Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated
Product Folder Links: LM2990
LM2990
www.ti.com
SNVS093G –JUNE 1999–REVISED MAY 2015
5 Pin Configuration and Functions
3 Pins
TO-220 (NDE)
Top View
3 Pins 3 Pins
DDPAK/TO-263 (KTT) DDPAK/TO-263 (KTT)
Top View Side View
Pin Functions
PIN I/O DESCRIPTION
NAME NO.
GND 1 — Ground.
IN 2 I Input voltage.
OUT 3 O Regulated output voltage.
Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: LM2990
LM2990
SNVS093G –JUNE 1999–REVISED MAY 2015
www.ti.com
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)(2)
MIN MAX UNIT
Input voltage –26 0.3 V
Power dissipation(3) Internally limited
Junction temperature (TJmax) 125 °C
Storage temperature, Tstg –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) The maximum power dissipation is a function of TJmax, RθJA, and TA. The maximum allowable power dissipation at any ambient
temperature is PD = (TJmax −TA)/RθJA. If this dissipation is exceeded, the die temperature will rise above 125°C, and the LM2990 will
eventually go into thermal shutdown at a TJof approximately 160°C. Please refer to Thermal Information for more details.
6.2 ESD Ratings VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)(1)
MIN NOM MAX UNIT
Junction temperature (TJ) –40 125 °C
Input voltage (operational) –26 –6 V
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
6.4 Thermal Information LM2990S LM2990T
THERMAL METRIC(1) TO-263 (KTT) TO-220 (NDE) UNIT
3 PINS 3 PINS
RθJA Junction-to-ambient thermal resistance, High-K 41.3 22.8
RθJC(top) Junction-to-case (top) thermal resistance 43 15.7
RθJB Junction-to-board thermal resistance 23.2 4.2 °C/W
ψJT Junction-to-top characterization parameter 11.3 2.2
ψJB Junction-to-board characterization parameter 20.4 4.2
RθJC(bot) Junction-to-case (bottom) thermal resistance 0.5 0.7
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
4Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated
Product Folder Links: LM2990
LM2990
www.ti.com
SNVS093G –JUNE 1999–REVISED MAY 2015
6.5 Electrical Characteristics: –5 V and –5.2 V
VIN =−5 V + VOUT(NOM)(1), IOUT = 1 A, COUT = 47 μF, unless otherwise specified. All limits apply for TJ= 25°C, unless otherwise
indicated in the Test Conditions. LM2990 –5V LM2990 –5.2V
PARAMETER TEST CONDITIONS UNIT
MIN(2) TYP(3) MAX(2) MIN(2) TYP(3) MAX(2)
5 mA ≤IOUT ≤1 A −5.1 –5 –4.9 −5.3 –5.2 –5.1 V
Output voltage 5 mA ≤IOUT ≤1 A
(VOUT)–5.25 –5 −4.75 –5.46 –5.2 –4.94 V
−40°C ≤TJ≤125°C
IOUT = 5 mA,
Line regulation 4 40 4 40 mV
VO(NOM) −1 V > VIN >−26 V
Load regulation 50 mA ≤IOUT ≤1 A 1 40 1 40 mV
IOUT = 0.1 A, ΔVOUT ≤100 mV 0.1 0.3 0.1 0.3 V
−40°C ≤TJ≤125°C
Dropout voltage IOUT = 1 A, ΔVOUT ≤100 mV 0.6 1 0.6 1 V
−40°C ≤TJ≤125°C
IOUT ≤1 A 1 5 1 5
Quiescent mA
current (Iq)IOUT = 1 A, VIN = VOUT(NOM) 9 50 9 50
Short circuit RL= 1 Ω(4) 1.5 1.8 1.5 1.8 A
current
Maximum output See(4) 1.5 1.8 1.5 1.8 A
current
Ripple rejection Vripple = 1 Vrms,50 58 50 58 dB(min)
ƒripple = 1 kHz, IOUT = 5 mA
Output noise 10 Hz to 100 kHz, IOUT = 5 mA μV(max)
250 750 250 750
voltage
Long-term 1000 Hours ppm
2000 2000
stability
(1) VOUT(NOM) is the nominal (typical) regulator output voltage, −5 V, −5.2 V, −12 V or −15 V.
(2) Limits are specified and 100% production tested.
(3) Typicals are at TJ= 25°C and represent the most likely parametric norm.
(4) The short circuit current is less than the maximum output current with the −12 V and −15 V versions due to internal foldback current
limiting. The −5 V and −5.2 V versions, tested with a lower input voltage, does not reach the foldback current limit and therefore
conducts a higher short circuit current level. If the LM2990 output is pulled above ground, the maximum allowed current sunk back into
the LM2990 is 1.5 A.
Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Links: LM2990
LM2990
SNVS093G –JUNE 1999–REVISED MAY 2015
www.ti.com
6.6 Electrical Characteristics: –12 V and –15 V
VIN =−5 V + VOUT(NOM)(1), IOUT = 1 A, COUT = 47 μF, unless otherwise specified. All limits apply for TJ= 25°C, unless otherwise
indicated in the Test Conditions. LM2990 –12V LM2990 –15V
PARAMETER TEST CONDITIONS UNIT
MIN(2) TYP(3) MAX(2) MIN(2) TYP(3) MAX(2)
5 mA ≤IOUT ≤1 A −12.24 –12 –11.76 −15.30 –15 –14.70 V
Output voltage 5 mA ≤IOUT ≤1 A
(VOUT)–12.60 –12 −11.40 –15.75 –15 –14.25 V
−40°C ≤TJ≤125°C
IOUT = 5 mA,
Line regulation 6 60 6 60 mV
VOUT(NOM) −1 V > VIN >−26 V
Load regulation 50 mA ≤IOUT ≤1 A 3 50 3 50 mV
IOUT = 0.1 A, ΔVOUT ≤100 mV 0.1 0.3 0.1 0.3 V
−40°C ≤TJ≤125°C
Dropout voltage IOUT = 1 A, ΔVOUT ≤100 mV 0.6 1 0.6 1 V
−40°C ≤TJ≤125°C
IOUT ≤1 A 1 5 1 5
Quiescent mA
current (Iq)IOUT = 1 A, VIN = VOUT(NOM) 9 50 9 50
Short circuit RL= 1 Ω(4) 0.9 1.2 0.75 1.2 A
current
Maximum output See(4) 1.4 1.8 1.4 1.8 A
current
Ripple rejection Vripple = 1 Vrms,42 52 42 52 dB(min)
ƒripple = 1 kHz, IOUT = 5 mA
Output noise 10 Hz to 100 kHz, IOUT = 5 mA μV(max)
500 1500 500 1500
voltage
Long-term 1000 hours ppm
2000 2000
stability
(1) VOUT(NOM) is the nominal (typical) regulator output voltage, −5 V, −5.2 V, −12 V or −15 V.
(2) Limits are specified and 100% production tested.
(3) Typicals are at TJ= 25°C and represent the most likely parametric norm.
(4) The short circuit current is less than the maximum output current with the −12 V and −15 V versions due to internal foldback current
limiting. The −5 V and −5.2 V versions, tested with a lower input voltage, does not reach the foldback current limit and therefore
conducts a higher short circuit current level. If the LM2990 output is pulled above ground, the maximum allowed current sunk back into
the LM2990 is 1.5 A.
6.7 Typical Characteristics
Figure 1. Dropout Voltage Figure 2. Normalized Output Voltage
6Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated
Product Folder Links: LM2990
LM2990
www.ti.com
SNVS093G –JUNE 1999–REVISED MAY 2015
Typical Characteristics (continued)
Figure 3. LM2990-5.0 and LM2990-5.2 Quiescent Current Figure 4. LM2990-12 Quiescent Current
Figure 6. LM2990-5 and LM2990-5.2 Low Voltage Behavior
Figure 5. LM2990-15 Quiescent Current
Figure 8. LM2990-5 and LM2990-5.2 Load Transient
Figure 7. LM2990-5 and LM2990-5.2 Line Transient Response
Response
Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 7
Product Folder Links: LM2990
LM2990
SNVS093G –JUNE 1999–REVISED MAY 2015
www.ti.com
Typical Characteristics (continued)
Figure 10. LM2990-12 and LM2990-15 Line Transient
Figure 9. LM2990-12 and LM2990-15 Low-Voltage Behavior Response
Figure 11. LM2990-12 and LM2990-15 Load Transient Figure 12. LM2990-5 and LM2990-5.2 Ripple Rejection
Response
Figure 13. LM2990-5 and LM2990-5.2 Output Impedance Figure 14. Maximum Output Current
8Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated
Product Folder Links: LM2990
LM2990
www.ti.com
SNVS093G –JUNE 1999–REVISED MAY 2015
Typical Characteristics (continued)
Figure 15. LM2990-12 and LM2990-15 Ripple Rejection Figure 16. LM2990-12 and LM2990-15 Output Impedance
Figure 18. Maximum Power Dissipation (TO-220)
Figure 17. Maximum Output Current
The maximum power dissipation is a function of TJmax, RθJA, and TA. The maximum allowable power dissipation at any ambient
temperature is PD= (TJmax −TA)/RθJA. If this dissipation is exceeded, the die temperature will rise above 125°C, and the LM2990 will
eventually go into thermal shutdown at a TJof approximately 160°C. Please refer to Thermal Information for more details.
Figure 19. Maximum Power Dissipation (TO-263)
Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 9
Product Folder Links: LM2990
Reference
Pass Device
Error Amp
IN OUT
GND
LM2990
SNVS093G –JUNE 1999–REVISED MAY 2015
www.ti.com
7 Detailed Description
7.1 Overview
The LM2990 is a three-terminal, low dropout, 1-A negative voltage regulator available with fixed output voltages
of −5, −5.2, −12, and −15 V. The LM2990 is a negative power supply ideally suited for a dual-supply system
when using together with LM2940 series. The device may also be used as a fixed or adjustable current sink load.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Fixed Output-Voltage Options
The LM2990 provides 4 fixed output options: −5 V, −5.2 V, −12 V, and −15 V. Output voltage accuracy is
ensured to ±5% over load and temperature extremes.
7.3.2 Low Dropout Voltage
Generally speaking, the dropout voltage (VDO) refers to the voltage difference between the IN pin and the OUT
pin when the PNP pass element is fully on and is characterized by the classic Collector-to-Emitter saturation
voltage, VCE(SAT). VDO indirectly specifies a minimum input voltage above the nominal programmed output voltage
at which the output voltage is expected to remain within its accuracy boundary.
7.3.3 Short Circuit Protection (Current Limit)
The internal current limit circuit is used to protect the LDO against high-load current faults or shorting events. The
LDO is not designed to operate in a steady-state current limit. During a current-limit event, the LDO sources
constant current. Therefore, the output voltage falls when load impedance decreases. Note also that if a current
limit occurs and the resulting output voltage is low, excessive power may be dissipated across the LDO, resulting
in a thermal shutdown of the output. A fold back feature limits the short-circuit current to protect the regulator
from damage under all load conditions. If OUT is forced below 0 V before EN goes high, and the load current
required exceeds the fold back current limit, the device may not start up correctly.
10 Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated
Product Folder Links: LM2990
LM2990
www.ti.com
SNVS093G –JUNE 1999–REVISED MAY 2015
Feature Description (continued)
7.3.4 Thermal Protection
The device contains a thermal shutdown protection circuit to turn off the output current when excessive heat is
dissipated in the LDO. The thermal time-constant of the semiconductor die is fairly short, and thus the output
cycles on and off at a high rate when thermal shutdown is reached until the power dissipation is reduced. The
internal protection circuitry of the device is designed to protect against thermal overload conditions. The circuitry
is not intended to replace proper heat sinking. Continuously running the device into thermal shutdown degrades
its reliability.
7.4 Device Functional Modes
7.4.1 Operation with VOUT(TARGET) –5 V ≥VIN > –26 V
The device operates if the input voltage is within VOUT(TARGET) –5 V to –26 V range. At input voltages beyond the
VIN requirement, the devices do not operate correctly, and output voltage may not reach target value.
Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 11
Product Folder Links: LM2990
LM2990
SNVS093G –JUNE 1999–REVISED MAY 2015
www.ti.com
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LM2990 is a 1-A negative voltage regulator with an operating VIN range of –6 V to –26 V, and a regulated
VOUT having 5% accuracy with a maximum rated IOUT current of 1 A. Efficiency is defined by the ratio of output
voltage to input voltage because the LM2990 is a linear voltage regulator. To achieve high efficiency, the dropout
voltage (VIN – VOUT) must be as small as possible, thus requiring a very low dropout LDO.
Successfully implementing an LDO in an application depends on the application requirements. If the
requirements are simply input voltage and output voltage, compliance specifications (such as internal power
dissipation or stability) must be verified to ensure a solid design. If timing, start-up, noise, PSRR, or any other
transient specification is required, the design becomes more challenging.
8.2 Typical Application
8.2.1 –5 V Post Regulator for an Isolated Switching Power Supply
Figure 20. Post Regulator for an Isolated Switching Power Supply
8.2.1.1 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
Table 1. Design Parameters
DESIGN PARAMETER DESIGN REQUIREMENT
Input voltage –10 V, provided by the DC-DC converter switching at 1 MHz
Output voltage -5 V, ±10%
Output current 5 mA to 400 mA
RMS noise, 10 Hz to 100 kHz < 1 mVRMS, IOUT = 5 mA
PSRR at 1KHz > 45 dB, IOUT = 5 mA
8.2.1.2 Detailed Design Procedure
At 400-mA loading, the dropout of the LM2990 has 1-V maximum dropout over temperature, thus an –5 V
headroom is sufficient for operation over both input and output voltage accuracy. The efficiency of the LM2990 in
this configuration is VOUT / VIN = 50%.
To achieve the smallest form factor, the TO-263(KTT) package is selected. Input and output capacitors should be
selected in accordance with the External Capacitors section. Aluminum capacitances of 470 μF for the input and
50-μF capacitors for the output are selected. With an efficiency of 50% and a 400-mA maximum load, the internal
power dissipation is 2000 mW, which corresponds to 82.5°C junction temperature rise for the TO-263 package.
With an 25°C ambient temperature, the junction temperature is at 107.5°C.
12 Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated
Product Folder Links: LM2990
LM2990
www.ti.com
SNVS093G –JUNE 1999–REVISED MAY 2015
8.2.1.2.1 External Capacitors
The LM2990 regulator requires an output capacitor to maintain stability. The capacitor must be at least 10-μF
aluminum electrolytic or 1-μF solid tantalum. The equivalent series resistance (ESR) of the output capacitor must
be less than 10 Ω, or the zero added to the regulator frequency response by the ESR could reduce the phase
margin, creating oscillations. An input capacitor, of at least 1-μF solid tantalum or 10-μF aluminum electrolytic, is
also needed if the regulator is situated more than 6 from the input power supply filter.
8.2.1.2.2 Forcing The Output Positive
Due to an internal clamp circuit, the LM2990 can withstand positive voltages on its output. If the voltage source
pulling the output positive is DC, the current must be limited to 1.5 A. A current over 1.5 A fed back into the
LM2990 could damage the device. The LM2990 output can also withstand fast positive voltage transients up to
26V, without any current limiting of the source. However, if the transients have a duration of over 1 ms, the
output should be clamped with a Schottky diode to ground.
Figure 21. Output Capacitor ESR
8.2.1.3 Application Curves
Figure 22. LM2990-5 Line Transient Response Figure 23. LM2990-5 Load Transient Response
8.2.2 Fixed or Adjustable Current Sink
The LM2990 is configurable as a fixed or adjustable current sink. As Figure 24 and Figure 25 show, the sink
current is determined by the resistor value — to achieve adjustable sink current, add one adjustable resistor
between output and load.
Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 13
Product Folder Links: LM2990
LM2990
SNVS093G –JUNE 1999–REVISED MAY 2015
www.ti.com
Figure 24. Fixed Current Sink Figure 25. Adjustable Current Sink
8.2.2.1 Design Requirements
See Design Requirements.
8.2.2.2 Detailed Design Procedure
See Detailed Design Procedure.
8.2.2.3 Application Curves
See Application Curves.
9 Power Supply Recommendations
The LM2990 is designed to operate from an input voltage supply range between –6 V and –26 V. The input
voltage range should provides adequate headroom in order for the device to have a regulated output. This input
supply must be well regulated.
14 Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated
Product Folder Links: LM2990
12 3
IN
GND
OUT
VIN
Input
Capacitor
VOUT
Output
Capacitor
INPUT
+
+
LM2990
www.ti.com
SNVS093G –JUNE 1999–REVISED MAY 2015
10 Layout
10.1 Layout Guidelines
For best overall performance, place all circuit components on the same side of the circuit board and as near as
practical to the respective LDO pin connections. Place ground return connections to the input and output
capacitor, and to the LDO ground pin as close to each other as possible, connected by a wide, component-side,
copper surface. The use of vias and long traces to create LDO circuit connections is strongly discouraged and
negatively affects system performance. This grounding and layout scheme minimizes inductive parasitics, and
thereby reduces load-current transients, minimizes noise, and increases circuit stability. A ground reference
plane is also recommended and is either embedded in the PCB itself or located on the bottom side of the PCB
opposite the components. This reference plane serves to assure accuracy of the output voltage, shield noise,
and behaves similar to a thermal plane to spread (or sink) heat from the LDO device. In most applications, this
ground plane is necessary to meet thermal requirements.
10.2 Layout Example
Figure 26. LM2990 TO-263 Board Layout
Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 15
Product Folder Links: LM2990
LM2990
SNVS093G –JUNE 1999–REVISED MAY 2015
www.ti.com
11 Device and Documentation Support
11.1 Device Support
11.1.1 Device Nomenclature
Dropout Voltage: The input-output voltage differential at which the circuit ceases to regulate against further
reduction in input voltage. Measured when the output voltage has dropped 100 mV from the
nominal value obtained at (VOUT + 5 V) input, dropout voltage is dependent upon load current and
junction temperature.
Input Voltage: The DC voltage applied to the input terminals with respect to ground.
Input-Output Differential: The voltage difference between the unregulated input voltage and the regulated
output voltage for which the regulator will operate.
Line Regulation: The change in output voltage for a change in the input voltage. The measurement is made
under conditions of low dissipation or by using pulse techniques such that the average chip
temperature is not significantly affected.
Load Regulation: The change in output voltage for a change in load current at constant chip temperature.
Long Term Stability: Output voltage stability under accelerated life-test conditions after 1000 hours with
maximum rated voltage and junction temperature.
Output Noise Voltage: The rms AC voltage at the output, with constant load and no input ripple, measured over
a specified frequency range.
Quiescent Current: That part of the positive input current that does not contribute to the positive load current.
The regulator ground lead current.
Ripple Rejection: The ratio of the peak-to-peak input ripple voltage to the peak-to-peak output ripple voltage.
Temperature Stability of VOUT:The percentage change in output voltage for a thermal variation from room
temperature to either temperature extreme.
11.2 Trademarks
All trademarks are the property of their respective owners.
11.3 Electrostatic Discharge Caution
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.
11.4 Glossary
SLYZ022 —TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
16 Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated
Product Folder Links: LM2990
PACKAGE OPTION ADDENDUM
www.ti.com 9-Jun-2020
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
LM2990S-12 NRND DDPAK/
TO-263 KTT 3 45 TBD Call TI Call TI -40 to 125 LM2990S
-12 P+
LM2990S-12/NOPB ACTIVE DDPAK/
TO-263 KTT 3 45 Green (RoHS
& no Sb/Br) SN Level-3-245C-168 HR -40 to 125 LM2990S
-12 P+
LM2990S-15 NRND DDPAK/
TO-263 KTT 3 45 TBD Call TI Call TI -40 to 125 LM2990S
-15 P+
LM2990S-15/NOPB ACTIVE DDPAK/
TO-263 KTT 3 45 Green (RoHS
& no Sb/Br) SN Level-3-245C-168 HR -40 to 125 LM2990S
-15 P+
LM2990S-5.0 ACTIVE DDPAK/
TO-263 KTT 3 45 TBD Call TI Call TI -40 to 125 LM2990S
-5.0 P+
LM2990S-5.0/NOPB ACTIVE DDPAK/
TO-263 KTT 3 45 Green (RoHS
& no Sb/Br) SN Level-3-245C-168 HR -40 to 125 LM2990S
-5.0 P+
LM2990SX-12 NRND DDPAK/
TO-263 KTT 3 500 TBD Call TI Call TI -40 to 125 LM2990S
-12 P+
LM2990SX-12/NOPB ACTIVE DDPAK/
TO-263 KTT 3 500 Green (RoHS
& no Sb/Br) SN Level-3-245C-168 HR -40 to 125 LM2990S
-12 P+
LM2990SX-15 NRND DDPAK/
TO-263 KTT 3 500 TBD Call TI Call TI -40 to 125 LM2990S
-15 P+
LM2990SX-15/NOPB ACTIVE DDPAK/
TO-263 KTT 3 500 Green (RoHS
& no Sb/Br) SN Level-3-245C-168 HR -40 to 125 LM2990S
-15 P+
LM2990SX-5.0 ACTIVE DDPAK/
TO-263 KTT 3 500 TBD Call TI Call TI -40 to 125 LM2990S
-5.0 P+
LM2990SX-5.0/NOPB ACTIVE DDPAK/
TO-263 KTT 3 500 Green (RoHS
& no Sb/Br) SN Level-3-245C-168 HR -40 to 125 LM2990S
-5.0 P+
LM2990T-12 NRND TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2990T
-12 P+
LM2990T-12/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br) SN Level-1-NA-UNLIM -40 to 125 LM2990T
-12 P+
LM2990T-15 NRND TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2990T
-15 P+
LM2990T-15/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br) SN Level-1-NA-UNLIM -40 to 125 LM2990T
-15 P+
LM2990T-5.0 NRND TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2990T
-5.0 P+
PACKAGE OPTION ADDENDUM
www.ti.com 9-Jun-2020
Addendum-Page 2
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
LM2990T-5.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br) SN Level-1-NA-UNLIM -40 to 125 LM2990T
-5.0 P+
LM2990T-5.2/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS
& no Sb/Br) SN Level-1-NA-UNLIM -40 to 125 LM2990T
-5.2 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.
(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.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LM2990SX-12 DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2990SX-12/NOPB DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2990SX-15 DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2990SX-15/NOPB DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2990SX-5.0 DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2990SX-5.0/NOPB DDPAK/
TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
PACKAGE MATERIALS INFORMATION
www.ti.com 29-Sep-2019
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LM2990SX-12 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2990SX-12/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2990SX-15 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2990SX-15/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2990SX-5.0 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
LM2990SX-5.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0
PACKAGE MATERIALS INFORMATION
www.ti.com 29-Sep-2019
Pack Materials-Page 2
MECHANICAL DATA
NDE0003B
www.ti.com
MECHANICAL DATA
KTT0003B
www.ti.com
BOTTOM SIDE OF PACKAGE
TS3B (Rev F)
IMPORTANT NOTICE AND DISCLAIMER
TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATASHEETS), DESIGN RESOURCES (INCLUDING REFERENCE
DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS”
AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD
PARTY INTELLECTUAL PROPERTY RIGHTS.
These resources are intended for skilled developers designing with TI products. You are solely responsible for (1) selecting the appropriate
TI products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable
standards, and any other safety, security, or other requirements. These resources are subject to change without notice. TI grants you
permission to use these resources only for development of an application that uses the TI products described in the resource. Other
reproduction and display of these resources is prohibited. No license is granted to any other TI intellectual property right or to any third
party intellectual property right. TI disclaims responsibility for, and you will fully indemnify TI and its representatives against, any claims,
damages, costs, losses, and liabilities arising out of your use of these resources.
TI’s products are provided subject to TI’s Terms of Sale (www.ti.com/legal/termsofsale.html) or other applicable terms available either on
ti.com or provided in conjunction with such TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable
warranties or warranty disclaimers for TI products.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2020, Texas Instruments Incorporated
