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High accuracy output voltage
Guaranteed 100 mA output current
Extremely low quiescent current
Extremely tight load and line regulation
Requires only a 1.0碌F output capacitor for stability
Internal Current and Thermal Limiting
Error 鏗俛g warns of output dropout
Logic-controlled electronic shutdown
Output programmable from 1.24 to 29V
Fixed 3.3V version available
-25擄C to +85擄C operating range
8 lead SOIC package
Description
The RC2951 is a voltage regulator speci鏗乧ally designed to
maintain proper regulation with a very low dropout voltage
(Typ. 40mV at light loads and 380 mV at 100mA). It has a
low quiescent bias current of 75碌A(chǔ) and is capable of supply-
ing output currents in excess of 100mA. It has internal cur-
rent and thermal limiting protection. The output can be
programmed from 1.24V to 29V with two external resistors.
A 鏗亁ed output voltage (3.3V) is also available.
The error 鏗俛g output can be used as power-on reset for
warning of a low output voltage. The Shutdown input feature
allows a logic level signal to turn on and off the regulator
output. The RC2951 is ideally suited for battery powered
computer, consumer, and industrial equipment where an
extension of useful battery life is desirable. The RC2951 is
available in an 8-pin SOIC package.
Block Diagram
Unregulated DC
7
+
Feed-
Back
8
Input
1
Output
2
+
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From
CMOS
or TTL
3
Shut
Down
+
+
60 mV
+
1.23V
Reference
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Error
4
Ground
Error Detection Comparator
To CMOS
or TTL
Error
Amplifier
6
V
TAP
5
330k鈩?/div>
+
See Application
Discussion
Sense
V
OUT
I
L
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100 mA
PRELIMINARY INFORMATION
describes products that are not in full production at the time of printing. Specifications are based on design goals
REV. 1.0.1 4/8/02
and limited characterization. They may change without notice. Contact Raytheon for current information.
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