LP2978 Datasheet | National Semiconductor

Description The LP2978 is a 50 m A, fixed-output voltage regulator designed 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 specifications critical to battery-powered designs: Dropout Voltage: Typically 120 m V @ 50 m A load, and 7 m V @ 1 m A load. Ground Pin Current: Typically 350 µA @ 50 m A load, and 75 µA @ 1 m A load. Enhanced Stability: The LP2978 is stable with output capacitor 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 n F bypass capacitor, output noise can be reduced to 30 µV (typical). Features n n n n n n n n n n n n n Ultra low dropout voltage Smallest possible size (SOT-23 Package) Requires minimum external ponents 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 ZOUT: 0.3Ω typical (10 Hz to 1 MHz) Overtemperature/overcurrent protection - 40˚C to +125˚C junction temperature range Custom voltages available Applications n n n n Cellular Phone Palmtop/Laptop puter Personal Digital Assistant (PDA) Camcorder, Personal Stereo, Camera Block Diagram DS100935-1 VIP™ is a trademark of National Semiconductor Corporation. © 2000 National Semiconductor Corporation DS100935 .national. Basic Application Circuit DS100935-2 - ON/OFF input must be actively terminated. Tie to VIN if this function is not to be used. - - Minimum capacitance is shown to ensure stability (may be increased without limit). Ceramic capacitor required for output (see Application Hints). - - - Reduces output noise...