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LP2989 Datasheet

500-mA Ultra Low-Dropout Regulator

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LP2989
SNVS083O – FEBRUARY 2005 – REVISED MARCH 2015
LP2989 Micropower and Low-Noise, 500-mA Ultra Low-Dropout Regulator for Use With
Ceramic Output Capacitors
1 Features
1 2.1-V to 16-V Input Voltage Range
• 2.5-V to 5-V Fixed Output Voltage Options
• Ultra-Low Dropout Voltage
• 500-mA Continuous Output Current
• Very Low Output Noise With External Capacitor
• < 0.8-µA Quiescent Current When Shutdown
• Low Ground Pin Current at All Loads
• 0.75% Output Voltage Accuracy (A Grade)
• High Peak Current Capability (800-mA typical)
• Overtemperature and Overcurrent Protection
40°C to 125°C Junction Temperature Range
2 Applications
• Notebooks and Desktop PCs
• PDAs and Palmtop Computers
• Wireless Communication Pins
• SMPS Post-Regulators
3 Description
The LP2989 is a fixed-output 500-mA precision LDO
regulator designed for use with ceramic output
capacitors.
Output noise can be reduced to 18 μV (typical) by
connecting an external 10-nF capacitor to the bypass
pin.
Using an optimized Vertically Integrated PNP (VIP)
process, the LP2989 delivers superior performance:
Dropout Voltage: Typically 310 mV at 500-mA
load, and 1 mV at 100-µA load.
Ground Pin Current: Typically 3 mA at 500-mA
load, and 110 µA at 100-µA load.
Sleep Mode: The LP2989 draws less than 0.8-µA
quiescent current when SHUTDOWN pin is pulled
low.
Error Flag: The built-in error flag goes low when
the output drops approximately 5% below
nominal.
Precision Output: Output voltage accuracy is
0.75% (A grade) and 1.25% (standard grade) at
room temperature.
For output voltages < 2 V, see LP2989LV (SNVS086)
data sheet.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
WSON (8)
4.00 mm x 4.00 mm
LP2989
SOIC (8)
4.90 mm x 3.91 mm
VSSOP (8)
3.00 mm x 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application
*Capacitance values shown are minimum required to assure stability, but may be increased without limit. Larger
output capacitor provides improved dynamic response. See the Output Capacitor section.
**Shutdown must be actively terminated (see the Shutdown Input Operation section). Tie to IN (pin 4) if not use.
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

LP2989 Datasheet Preview

LP2989 Datasheet

500-mA Ultra Low-Dropout Regulator

No Preview Available !

LP2989
SNVS083O – FEBRUARY 2005 – REVISED MARCH 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....................... 5
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 14
7.1 Overview ................................................................. 14
7.2 Functional Block Diagram ....................................... 14
7.3 Feature Description................................................. 14
7.4 Device Functional Modes........................................ 15
8 Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Application ................................................. 16
9 Power Supply Recommendations...................... 20
10 Layout................................................................... 20
10.1 Layout Guidelines ................................................. 20
10.2 Layout Example .................................................... 20
11 Device and Documentation Support ................. 21
11.1 Documentation Support ....................................... 21
11.2 Trademarks ........................................................... 21
11.3 Electrostatic Discharge Caution ............................ 21
11.4 Glossary ................................................................ 21
12 Mechanical, Packaging, and Orderable
Information ........................................................... 22
4 Revision History
Changes from Revision N (December 2014) to Revision O
Page
• Changed 30-V to 16-V ........................................................................................................................................................... 1
• Deleted trademark symbol from VIP which is no longer trademarked .................................................................................. 1
• Changed pin names to TI nomenclature; references to National to TI; add notes to Typical Application on first page;
fix errors in EC table reformat; replace Handling Ratings with ESD Ratings; take out Output Voltage Options and
add graphic to Mechanical section; changed LLP package name references to WSON; added overbar to
SHUTDOWN pin references; fix ulink for LP2989LV references. .......................................................................................... 1
• Changed description of N/C pin; add description of Thermal Pad; change "Ground" to "Thermal Pad" for NGN
drawing .................................................................................................................................................................................. 3
• Changed reference to National to TI ..................................................................................................................................... 4
• Deleted "Operating" row from Input supply voltage; thermal values from footnote 2 ............................................................ 4
• Changed 1.6 to 16 in ROC input supply voltage ................................................................................................................... 5
• Added word "OFF" ................................................................................................................................................................. 6
• Changed "high" to "low" ....................................................................................................................................................... 14
• Changed wording of "Operation with Shutdown Control" subsection ................................................................................. 15
• Changed VON/OFF to VSD ....................................................................................................................................................... 15
• Changed "guaranteed" to "ensured" in "CAUTION". ............................................................................................................ 15
• Changed VON/OFF to VSD ....................................................................................................................................................... 15
• Changed wording of last sentence of introductory Detailed Design Procedure paragraph ................................................ 17
• Changed words "size" and "amount" for capacitors to "value" ............................................................................................ 17
• Changed wording of first sentence, second paragraph of Noise Bypass Capacitor subsection ......................................... 18
• Added Documentation Support section ............................................................................................................................... 21
Changes from Revision M (February 2005) to Revision N
Page
• Added Handling Rating table, Feature Description section, Device Functional Modes, Application and
Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation
Support section, and Mechanical, Packaging, and Orderable Information section; add updated Thermal Information
values .................................................................................................................................................................................... 1
2
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Product Folder Links: LP2989
Copyright © 2005–2015, Texas Instruments Incorporated


Part Number LP2989
Description 500-mA Ultra Low-Dropout Regulator
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