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LP2989IMX-2.5 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer LP2989IMX-2.5
Beschreibung Micropower/Low Noise/ 500 mA Ultra Low-Dropout Regulator For Use with Ceramic Output Capacitors
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 12 Seiten
LP2989IMX-2.5 Datasheet, Funktion
March 2000
LP2989
Micropower/Low Noise, 500 mA Ultra Low-Dropout
Regulator
For Use with Ceramic Output Capacitors
General Description
The LP2989 is a fixed-output 500 mA precision LDO regula-
tor designed for use with ceramic output capacitors.
Output noise can be reduced to 18µV (typical) by connecting
an external 10 nF capacitor to the bypass pin.
Using an optimized VIP(Vertically Integrated PNP) pro-
cess, the LP2989 delivers superior performance:
Dropout Voltage: Typically 310 mV @ 500 mA load, and 1
mV @ 100 µA load.
Ground Pin Current: Typically 3 mA @ 500 mA load, and
110 µA @ 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: Guaranteed output voltage accuracy is
0.75% (“A” grade) and 1.25% (standard grade) at room tem-
perature.
Features
n Ultra low dropout voltage
n Guaranteed 500 mA continuous output current
n Very low output noise with external capacitor
n SO-8 surface mount package
n <0.8 µA quiescent current when shutdown
n Low ground pin current at all loads
n 0.75% output voltage accuracy (“A” grade)
n High peak current capability (800 mA typical)
n Wide supply voltage range (16V max)
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
Applications
n Notebook/Desktop PC
n PDA/Palmtop Computer
n Wireless Communication Terminals
n SMPS Post-Regulator
Block Diagram
VIPis a trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS101339
DS101339-1
www.national.com






LP2989IMX-2.5 Datasheet, Funktion
Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF,
CIN = 1 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA, VOUT = 2.5V. (Continued)
Line Transient Response
Line Transient Response
Line Transient Response
DS101339-11
Line Transient Response
DS101339-26
Load Transient Response
DS101339-15
Load Transient Response
DS101339-16
DS101339-17
www.national.com
6
DS101339-18

6 Page









LP2989IMX-2.5 pdf, datenblatt
Physical Dimensions inches (millimeters) unless otherwise noted
SO-8 Package Type M
NS Package Number M08A
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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