LP2950ACN-3.3 Datasheet

IC型號：
LP2950ACN-3.3
PDF描述：
100 mA Low Dropout Voltage Regulators
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13頁
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LP2950/LP2951

100mA Low Dropout Voltage Regulators

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5.0V and 3.3V Versions at 100mA Output

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Very Low Quiescent Current

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Low Dropout Voltage: 380mV at 100mA

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Extremely Tight Load and Line Regulation

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Very Low Temperature Coefficient

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Current & Thermal Limiting

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Need Only 1

碌F

for Stability

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Offered in TO-92 (LP2950) & SOIC (LP2951)

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Direct Replacement For LP2950/LP2951

FEATURES

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Battery Powered Systems

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Cordless Telephones

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Radio Control Systems

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Portable/Palm Top/Notebook Computers

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Portable Consumer Equipment

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Portable Instrumentation

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Avionics

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SMPS Post-Regulator

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Voltage Reference

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Automotive Electronics

APPLICATIONS

LP2951 versions only

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Error Flag Warns of Output Dropout

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Logic-Controlled Electronic Shutdown

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Output Programmable From 1.24 to 29V

Now Available in Lead Free Packaging

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 feature low

quiescent current and low dropout voltage (typ. 50mV at light load and 380 mV at 100mA). This includes a tight initial tolerance

(0.5% typ.), extremely good load and line regulation (0.05% typ.), and very low output temperature coefficient (20 ppm/隆C typ.),

making the LP2950/LP2951 useful as a low-power voltage reference.

The error flag output feature is used as a power-on reset for warning of a low output voltage, due to a falling input voltage. The logic-

compatible shutdown feature enables the regulator to be switched ON and OFF. The LP2950 is offered in a 3-pin TO-92 package

compatible with other 5V, 3.3V regulators. The LP2951 is available in an 8-lead SOIC package.

Block diagram of LP2951

UNREGULATED DC

FEEDBACK

INPUT

OUTPUT

5V @ 100mA

MAX

SENSE

FROM

CMOS OR

TTL

180k鈩?/div>

ERROR

AMPLIFIER

5V TAP

SHUTDOWN

60 mV

330k鈩?/div>

60k鈩?/div>

______

ERROR

ERROR DETECTION

COMPARATOR

1碌F

TO CMOS OR

TTL

1.23V

REFERENCE

GROUND

Rev. 8/10/01

LP2950/51 100mA Low Dropout Voltage Regulators

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