LP2950AS Просмотр технического описания (PDF) - Signal Processing Technologies

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LP2950AS

100 mA Low Dropout Voltage Regulators

Signal Processing Technologies 

LP2950/LP2951

100 mA Low Dropout Voltage Regulators

FEATURES

• 5.0V, 3.3V and 3.0V Versions @ 100mA Output

• Very Low Quiescent Current

• Low Dropout Voltage

• Extremely Tight Load and Line Regulation

• Very Low Temperature Coefficient

• Current & Thermal Limiting

• Need Only 1 µF for Stability

• Offered in TO-263 & SOIC

• Direct Replacement For LP2950/LP2951 Sockets

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

PRODUCT DESCRIPTION

The 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 low

quiescent current and very low dropout voltage (Typ. 50mV at light load and 380 mV 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-263 package compatible with other 5V, 3.0V & 3.3V regulators. The LP2951 is also available in 8-pin plastic,

SO-8 packages.

The regulator output voltage may be pin-strapped for 5.0V, 3.0V or 3.3V or programmed from 1.24V to 29V with an external pair of

resistors. Look for SPX2950/51 for 150mA, for SPX2975 for 180mA and SPX2954 for 250mA.

8-Pin Surface Mount (S)

OUTPUT

SENSE

SHUTDOWN

GROUND

1

8

2 ALPHA 7

3 LAPS293501 6

4

5

INPUT

FEEDBACK

5V or 3.3V TAP

ERROR

Top View

TO-263-3 (T)

LP2950

123

VIN GND VOUT

Top View

Rev. 11/2/00

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