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LM2990 Datasheet

Negative Low-Dropout Regulator

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LM2990
SNVS093G – JUNE 1999 – REVISED MAY 2015
LM2990 Negative Low-Dropout Regulator
1 Features
1 Input Voltage: –26 V to –6 V
• Fixed Output Voltages: 5 V, 5.2 V, 12 V, and
15 V
• 5% Output Accuracy over Entire Operating Range
• Output Current in Excess of 1 A
• Dropout Voltage Typically 0.6 V at 1-A Load
• Low Quiescent Current
• Internal Short-Circuit Current Limit
• Internal Thermal Shutdown with Hysteresis
• Functional Complement to the LM2940 Series
2 Applications
• Post Switcher Regulator
• Local, On-Card Regulation
• Battery Operated Equipment
space
space
space
Typical Application
3 Description
The LM2990 is a three-terminal, low-dropout, 1-A
negative voltage regulator available with fixed output
voltages of 5 V, 5.2 V, 12 V, and 15 V.
The LM2990 uses circuit design techniques to
provide low-dropout and low-quiescent current. The
dropout voltage at 1-A load current is typically 0.6 V
and an ensured worst-case maximum of 1 V over the
entire operating temperature range. The quiescent
current is typically 1 mA with 1-A load current and an
input-output voltage differential greater than 3 V. A
unique circuit design of the internal bias supply limits
the quiescent current to only 9 mA (typical) when the
regulator is in the dropout mode (VOUT VIN 3 V).
Output voltage accuracy is ensured to ±5% over load
and temperature extremes.
The LM2990 also implements short-circuit proof, and
thermal shutdown includes hysteresis to enhance the
reliability of the device when overloaded for an
extended period of time.
All these features make the LM2990 an ideal
negative power supply suited for dual supply
systems. The device may also be used as fixed or
adjustable current sink load.
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.
* and **: 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
10 Ω over the same operating temperature
range as the regulator.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2990
DDPAK/TO-263 (3)
TO-220 (3)
10.20 mm x 9.00 mm
14.99 mm x 10.16 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
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.




etcTI

LM2990 Datasheet Preview

LM2990 Datasheet

Negative Low-Dropout Regulator

No Preview Available !

LM2990
SNVS093G – JUNE 1999 – REVISED MAY 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics: –5 V and –5.2 V............... 5
6.6 Electrical Characteristics: –12 V and –15 V.............. 6
6.7 Typical Characteristics .............................................. 6
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 11
8 Application and Implementation ........................ 12
8.1 Application Information............................................ 12
8.2 Typical Application ................................................. 12
9 Power Supply Recommendations...................... 14
10 Layout................................................................... 15
10.1 Layout Guidelines ................................................. 15
10.2 Layout Example .................................................... 15
11 Device and Documentation Support ................. 16
11.1 Device Support .................................................... 16
11.2 Trademarks ........................................................... 16
11.3 Electrostatic Discharge Caution ............................ 16
11.4 Glossary ................................................................ 16
12 Mechanical, Packaging, and Orderable
Information ........................................................... 16
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
2
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Product Folder Links: LM2990
Copyright © 1999–2015, Texas Instruments Incorporated



Part Number LM2990
Description Negative Low-Dropout Regulator
Maker etcTI
Total Page 3 Pages
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