LP2989 Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer	LP2989
Beschreibung	Micropower/Low Noise/ 500 mA Ultra Low-Dropout Regulator For Use with Ceramic Output Capacitors
Hersteller	National Semiconductor
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Gesamt 12 Seiten 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 VIP™ is a trademark of National Semiconductor Corporation. © 2000 National Semiconductor Corporation DS101339 DS101339-1 www.national.com 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 Physical Dimensions inches (millimeters) unless otherwise noted SO-8 Package Type M NS Package Number M08A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 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. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. 12 Page
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