LP2950 Datasheet, PDF (1/10 Pages) National Semiconductor (TI) – Series of Adjustable Micropower Voltage Regulators

CORPORATION
100mA Low Dropout
Voltage Regulators
LP2950 / LP2951
FEATURES
5V, 3.3V, and 3.0V Versions at 100mA Output
• _{Very Low Quiescent Current}
• _{Low Dropout Voltage}
• _{Extremely Tight Load and Line Regulation}
• _{Very Low Temperature Coefficient}
• _{Current and Thermal Limiting}
•• _{Needs Only 1µF for Stability}
LP2951 Versions Only
Error Flag Warns of Output Dropout
• _{Logic-Controlled Electronic Shutdown}
•• _{Output Programmable from 1.24 to 29V}
APPLICATIONS
Battery Powered Systems
• _{Cordless Telephones}
• _{Radio Control Systems}
• _{Portable / Palm Top / Notebook Computers}
• _{Portable Consumer Equipment}
• _{Portable Instrumentation}
• _Avionics
• _{SMPS Post-Regulator}
• _{Voltage Reference}
•• _{Automotive Electronics}
PIN CONNECTIONS
8-PIN SURFACE MOUNT
OUTPUT 1
SENSE 2
SHUTDOWN 3
GROUND 4
LP2951
8 INPUT
7 FEEDBACK
6 5V OR 3.3V TAP
5 ERROR
TOP VIEW
1D-19
PRODUCT DESCRIPTION
The Calogic LP2950 and LP2951 are low power voltage
regulators. These devices are an excellent choice for use in
battery-powered applications such as cordless telephones,
radio control systems, and portable computers. The LP2950
and LP2951 features very low quiescent current and very low
dropout voltage (Typ. 50mV at light load and 380mV at 100mA).
This includes a tight initial tolerance of 0.5% typ., extremely
good load and line regulation 0.05% typ. and very low output
temperature coefficient, making the LP2950/LP2951 useful
as a low-power voltage reference.
The error flag output feature is used as power-on reset for
warning of a low output voltage, due to falling voltage input of
batteries. Another feature is the logic-compatible shutdown
input which enables the regulator to be switched on and off.
The LP2950 is offered in a 3-pin TO-92 package compatible
with other 5V, 3.0V, 3.3V regulators. The LP2951 is also available
in 8-pin plastic and SO-8.
The regulator output voltage may be pin-strapped for 5V, 3V
or 3.3 volts or programmed from 1.24 volt to 29 volts with an
external pair of resistors. Use of AS’s design, processing and
testing techniques make our LP2950 and LP2951 superior
over similar products.
ORDERING INFORMATION
PART
PACKAGE TEMPERATURE RANGE
LP2950ACN-X
LP2950CN-X
LP2951ACP-X
LP2951CP-X
LP2951ACS-X
LP2951CS-X
TO-92 (3-Pin)
TO-92 (3-Pin)
Plastic DIP (8-Pin)
Plastic DIP (8-Pin)
Plastic SOIC (8-Pin)
Plastic SOIC (8-Pin)
X = 3.0V, 3.3V or 5.0V
IND.
IND.
IND.
IND.
IND.
IND.
TO-92
123
1. OUTPUT
2. GROUND
3. INPUT
BOTTOM VIEW
1D-20
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: [phone], FAX: [phone]