LP2978 Datasheet, PDF (1/7 Pages) National Semiconductor (TI) – Micropower SOT, 50 mA Low-Noise Ultra Low-Dropout Regulator

July 2000
LP2978
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) pro-
cess, the LP2978 delivers unequalled performance in all
specifications 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
n Ultra low dropout voltage
n Smallest possible size (SOT-23 Package)
n Requires minimum external components
n Stable with low-ESR output capacitor
n <1 µA quiescent current when shut down
n Low ground pin current at all loads
n Output voltage accuracy 1% (A Grade)
n High peak current capability
n Wide supply voltage range (16V max)
n Low Z_OUT: 0.3Ω typical (10 Hz to 1 MHz)
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
n Custom voltages available
Applications
n Cellular Phone
n Palmtop/Laptop Computer
n Personal Digital Assistant (PDA)
n Camcorder, Personal Stereo, Camera
Block Diagram
VIP™ is a trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS100935
DS100935-1
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