Datasheet

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LM2990

www.ti.com

SNVS093D –JUNE 1999–REVISED APRIL 2013

LM2990 Negative Low Dropout Regulator

Check for Samples: LM2990

FEATURES

DESCRIPTION

The LM2990 is a three-terminal, low dropout, 1

• 5% Output Accuracy over Entire Operating

ampere negative voltage regulator available with fixed

Range

output voltages of −5, −5.2, −12, and −15V.

• Output Current in Excess of 1A

The LM2990 uses new circuit design techniques to

• Dropout Voltage Typically 0.6V at 1A Load

provide low dropout and low quiescent current. The

• Low Quiescent Current

dropout voltage at 1A load current is typically 0.6V

and an ensured worst-case maximum of 1V over the

• Internal Short Circuit Current Limit

entire operating temperature range. The quiescent

• Internal Thermal Shutdown with Hysteresis

current is typically 1 mA with 1A load current and an

• Functional Complement to the LM2940 Series

input-output voltage differential greater than 3V. A

unique circuit design of the internal bias supply limits

APPLICATIONS

the quiescent current to only 9 mA (typical) when the

regulator is in the dropout mode (V

OUT

− V

≤ 3V).

• Post Switcher Regulator

Output voltage accuracy is ensured to ±5% over load,

• Local, On-Card, Regulation

and temperature extremes.

• Battery Operated Equipment

The LM2990 is short-circuit proof, and thermal

shutdown includes hysteresis to enhance the

reliability of the device when overloaded for an

extended period of time. The LM2990 is available in a

3-lead package and is rated for operation over the

automotive temperature range of −40°C to +125°C.

Typical Application

*Required if the regulator is located further than 6 inches from the power supply filter capacitors. A 1 μF solid

tantalum or a 10 μF aluminum electrolytic capacitor is recommended.

**Required for stability. Must be at least a 10 μF aluminum electrolytic or a 1 μF solid tantalum to maintain stability.

May be increased without bound to maintain regulation during transients. Locate the capacitor as close as possible to

the regulator. The equivalent series resistance (ESR) is critical, and should be less than 10Ω over the same operating

temperature range as the 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 (20 pages)

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LM2990 www.ti.com SNVS093D – JUNE 1999 – REVISED APRIL 2013 LM2990 Negative Low Dropout Regulator Check for Samples: LM2990 FEATURES DESCRIPTION • The LM2990 is a three-terminal, low dropout, 1 ampere negative voltage regulator available with fixed output voltages of −5, −5.2, −12, and −15V. 1 2 • • • • • • 5% Output Accuracy over Entire Operating Range Output Current in Excess of 1A Dropout Voltage Typically 0.
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LM2990 SNVS093D – JUNE 1999 – REVISED APRIL 2013 www.ti.com Connection Diagrams Front View Figure 1. 3-Lead TO-220 Package See Package Number NDE0003B Top View Side View Figure 2. Surface-Mount DDPAK/TO-263 Package See Package Number KTT0003B Figure 3. Surface-Mount DDPAK/TO-263 Package See Package Number KTT0003B Top View Top View Figure 4. 16-Lead CDIP Package See Package Number NFE0016A Figure 5.
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LM2990 www.ti.com SNVS093D – JUNE 1999 – REVISED APRIL 2013 Operating Ratings (1) −40°C to +125°C Junction Temperature Range (TJ) −26V Maximum Input Voltage (Operational) (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.
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LM2990 SNVS093D – JUNE 1999 – REVISED APRIL 2013 www.ti.com Electrical Characteristics VIN = −5V + VO(NOM) (1), IO = 1A, CO = 47 μF, unless otherwise specified. Boldface limits apply over the entire operating temperature range, −40°C ≤ TJ ≤ 125°C, all other limits apply for TJ = 25°C. Parameter Output Voltage (VO) Conditions LM2990-12 Typ (2) 5 mA ≤ IO ≤ 1A LM2990-15 Limit (3) Units (Limit) −11.76 −14.70 V (max) −12.24 −15.30 V (min) −11.40 −14.25 V (max) −12.60 −15.
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LM2990 www.ti.com SNVS093D – JUNE 1999 – REVISED APRIL 2013 Definition of Terms 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 (VO + 5V) 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.
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LM2990 SNVS093D – JUNE 1999 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics 6 Dropout Voltage Normalized Output Voltage Figure 6. Figure 7. LM2990-5.0 and LM2990-5.2 Quiescent Current LM2990-12 Quiescent Current Figure 8. Figure 9. LM2990-15 Quiescent Current LM2990-5 and LM2990-5.2 Low Voltage Behavior Figure 10. Figure 11.
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LM2990 www.ti.com SNVS093D – JUNE 1999 – REVISED APRIL 2013 Typical Performance Characteristics (continued) LM2990-5 and LM2990-5.2 Line Transient Response LM2990-5 and LM2990-5.2 Load Transient Response Figure 12. Figure 13. LM2990-12 and LM2990-15 Low Voltage Behavior LM2990-12 and LM2990-15 Line Transient Response Figure 14. Figure 15. LM2990-12 and LM2990-15 Load Transient Response LM2990-5 and LM2990-5.2 Ripple Rejection Figure 16. Figure 17.
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LM2990 SNVS093D – JUNE 1999 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) LM2990-5 and LM2990-5.2 Output Impedance Maximum Output Current Figure 18. Figure 19. LM2990-12 and LM2990-15 Ripple Rejection LM2990-12 and LM2990-15 Output Impedance Figure 20. Figure 21. Maximum Output Current Figure 22.
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LM2990 www.ti.com SNVS093D – JUNE 1999 – REVISED APRIL 2013 Typical Performance Characteristics (continued) (1) Maximum Power Dissipation (TO-220) Maximum Power Dissipation (TO-263) (1) Figure 23. Figure 24. The maximum power dissipation is a function of TJmax, θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJmax − TA)/θJA.
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LM2990 SNVS093D – JUNE 1999 – REVISED APRIL 2013 www.ti.com APPLICATION HINTS 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 output capacitor's ESR must be less than 10Ω, or the zero added to the regulator frequency response by the ESR could reduce the phase margin, creating oscillations (refer to the graph on the right).
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LM2990 www.ti.
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LM2990 SNVS093D – JUNE 1999 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision C (April 2013) to Revision D • 12 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 1-Nov-2013 Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2990T-5.0/NOPB ACTIVE TO-220 NDE 3 45 Pb-Free (RoHS Exempt) CU SN Level-1-NA-UNLIM -40 to 125 LM2990T -5.0 P+ LM2990T-5.2 NRND TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2990T -5.2 P+ LM2990T-5.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 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.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) 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.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 *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.
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MECHANICAL DATA NDE0003B www.ti.
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MECHANICAL DATA KTT0003B TS3B (Rev F) BOTTOM SIDE OF PACKAGE www.ti.
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