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Micropower 500 mA Low Noise Low-Dropout Regulator for Applications with Output Voltages < 2V
LP2989LV
Micropower 500 mA Low Noise Low Dropout Regulator
for Applications with Output Voltages < 2V
Designed for Use with Very Low ESR Output Capacitors
General DescriptionThe LP2989LVisa 500 mA fixed-output voltage regulator
designedto provide high performance and low noisein
applications requiring output voltages< 2V.
Output noise canbe reducedto 18µV (typical)by connecting external10nF capacitortothe bypass pin.
Usingan optimized VIP™ (Vertically Integrated PNP) pro-
cess, the LP2989LV delivers superior performance:
Ground Pin Current: Typically3 mA@ 500 mA load, and
110µA@ 100µA load.
Sleep Mode: The LP2989LV draws less than0.8µA quies-
cent current when shutdownpinis pulled low.
Error Flag: The built-in error flag goes low when the output
drops approximately 5% below nominal.
Precision Output: Guaranteed output voltage accuracyis
0.75% (“A” grade) and 1.25% (standard grade)at room
temperature.
For output voltages≥ 2V, see LP2989 datasheet.
Features Ultra low dropout voltage Guaranteed 500 mA continuous output current Very low output noise with external capacitor SO-8, Mini SO-8,8 Lead LLP surface mount packages <0.8µA quiescent current when shutdown Low groundpin currentatall loads 0.75% output voltage accuracy (“A” grade) High peak current capability (800 mA typical) Wide supply voltage range (16V max) Overtemperature/overcurrent protection −40˚Cto +125˚C junction temperature range
Applications Notebook/Desktop PC PDA/Palmtop Computer Wireless Communication Terminals SMPS Post-Regulator
Block DiagramFebruary 2005
LP2989L
Micropower
Low
Noise
Low
Dropout
Regulator
for
Output
oltages
Designed
for
Use
with
ery
Low
ESR
Output
Capacitors
