LP2978_09 Datasheet, PDF (1/8 Pages) National Semiconductor (TI) – Micropower SOT, 50 mA Low-Noise Ultra Low-Dropout Regulator Designed for Use with Very Low ESR Output Capacitors

LP2978
OBSOLETE
April 23, 2009
Micropower SOT, 50 mA Low-Noise Ultra Low-Dropout
Regulator
Designed for Use with Very Low ESR Output Capacitors
General Description
The LP2978 is a 50 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 LP2978 delivers unequalled performance in all specifica-
tions critical to battery-powered designs:
Dropout Voltage: Typically 120 mV @ 50 mA load, and
7 mV @ 1 mA load.
Ground Pin Current: Typically 350 µA @ 50 mA load, and
75 µA @ 1 mA load.
Enhanced Stability: The LP2978 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 package uses 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).
Features
■ ^{Ultra low dropout voltage}
■ ^{Smallest possible size (SOT-23 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
10093501
VIP^® is a registered trademark of National Semiconductor Corporation.
© 2009 National Semiconductor Corporation 100935
100935 Version 6 Revision 2 Print Date/Time: 2009/04/23 16:08:18
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