LP2985 Datasheet, PDF (2/22 Pages) National Semiconductor (TI) – Micropower 150 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors

LP2985
April 26, 2011
Micropower 150 mA Low-Noise Ultra Low-Dropout
Regulator in SOT-23 and micro SMD Packages
Designed for Use with Very Low ESR Output Capacitors
General Description
The LP2985 is a 150 mA, fixed-output voltage regulator de-
signed to provide ultra low-dropout and low noise in battery
powered applications.
Using an optimized VIP^® (Vertically Integrated PNP) process,
the LP2985 delivers unequalled performance in all specifica-
tions critical to battery-powered designs:
Dropout Voltage: Typically 300 mV @ 150 mA load, and
7 mV @ 1 mA load.
Ground Pin Current: Typically 850 µA @ 150 mA load, and
75 µA @ 1 mA load.
Enhanced Stability: The LP2985 is stable with output ca-
pacitor ESR as low as 5 mΩ, which allows the use of ceramic
capacitors on the output.
Sleep Mode: Less than 1 µA quiescent current when ON/OFF
pin is pulled low.
Smallest Possible Size: SOT-23 and micro SMD packages
use absolute minimum board space.
Precision Output: 1% tolerance output voltages available (A
grade).
Low Noise: By adding a 10 nF bypass capacitor, output noise
can be reduced to 30 µV (typical).
Multiple voltage options, from 2.5V to 5.0V, are available as
standard products. Consult factory for custom voltages.
Features
■ ^{Ultra low dropout voltage}
■ ^{Guaranteed 150 mA output current}
■ ^{Smallest possible size (SOT-23, micro SMD package)}
■ ^{Requires minimum external components}
■ ^{Stable with low-ESR output capacitor}
■ ^{<1 µA quiescent current when shut down}
■ ^{Low ground pin current at all loads}
■ ^{Output voltage accuracy 1% (A Grade)}
■ ^{High peak current capability}
■ ^{Wide supply voltage range (16V max)}
■ ^{Low Z}_OUT^{: 0.3Ω typical (10 Hz to 1 MHz)}
■ ^{Overtemperature/overcurrent protection}
■ ^{−40°C to +125°C junction temperature range}
■ ^{Custom voltages available}
Applications
■ ^{Cellular Phone}
■ ^{Palmtop/Laptop Computer}
■ ^{Personal Digital Assistant (PDA)}
■ ^{Camcorder, Personal Stereo, Camera}
Block Diagram
VIP^® is a registered trademark of National Semiconductor Corporation.
© 2011 National Semiconductor Corporation 100140
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