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SPX2951CS-3.3 Datasheet

  • SPX2951CS-3.3

  • 150mA Low Dropout Voltage Regulator

  • 136.00KB

  • 13頁

  • SIPEX

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SPX2950/SPX2951
150mA Low Dropout Voltage Regulator
FEATURES
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5.0V and 3.3V at 150mA Output
Accurate: 0.5% for SPX2950A/SPX2951A
Very Low Quiescent Current
Low Dropout Voltage: 300mV at 150mA
Extremely Tight Load and Line Regulation
Very Low Temperature Coefficient
Current & Thermal Limiting
Need Only 1碌F for Stability
Offered in TO-92 (SPX2950) and SOIC
(SPX2951)
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Direct Replacement for LP2950/LP2951
SPX2951 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 30V
APPLICATIONS
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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
DESCRIPTION
The SPX2950 and SPX2951 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 SPX2950 and SPX2951 feature low quiescent current and low dropout voltage (typ. 20mV
at 100碌A(chǔ) and 300mV at 150mA). This includes a tight initial tolerance of (0.5% for SPX2950A/SPX2951A),
extremely good load and line regulation (0.05% typ.), and very low output temperature coefficient (20ppm/
擄C
typ.), making the SPX2950/SPX2951 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
voltage. The logic compatible shutdown feature enables the regulator to be switched ON and OFF. The
SPX2950 is offered in a 3-pin TO-92 package compatible with other 5.0V, 3.3V regulators. The SPX2951
is availiable in an 8-lead SOIC package.
UNREGULATED DC
5V
7
FEEDBACK
+
8
INPUT
1
OUTPUT
2
SENSE
+
_
FROM
CMOS OR
TTL
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6
ERROR
AMPLIFIER
5V TAP
3
SHUTDOWN
60 mV
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+
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+
5
______
ERROR
+
_
ERROR DETECTION
COMPARATOR
1碌F
.
.
TO CMOS OR
TTL
+
1.23V
4
REFERENCE
GROUND
Block Diagram of SPX2951, 8 Lead 5V Version
Rev. 3/6/03
SPX2950/SPX2951 150mA Low Dropout Voltage Regulator
漏Copyright 2003 Sipex Corporation
1

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