RC2951 Datasheet, PDF (1/11 Pages) Fairchild Semiconductor – Adjustable Micropower Voltage Regulator

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RC2951
Adjustable Micropower Voltage Regulator
Features
• High accuracy output voltage
• Guaranteed 100 mA output current
• Extremely low quiescent current
• Extremely tight load and line regulation
• Requires only a 1.0µF output capacitor for stability
• Internal Current and Thermal Limiting
• Error flag warns of output dropout
• Logic-controlled electronic shutdown
• Output programmable from 1.24 to 29V
• Fixed 3.3V version available
• -25°C to +85°C operating range
• 8 lead SOIC package
Description
The RC2951 is a voltage regulator specifically 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 75µA 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 fixed output voltage (3.3V) is also available.
The error flag 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
From
CMOS
or TTL
3
Shut
Down
+
–
Error
Amplifier
+
+
60 mV
–
+ _1.23V
Reference
Error Detection Comparator
V_OUT
I_L ≤ 100 mA
2
Sense
6
V_TAP
5
Error
4
Ground
+
See Application
Discussion
330kΩ
To CMOS
or TTL
PRELIMINARY INFORMATION describes products that are not in full production at the time of printing. Specifications are ba_Rse_Ed_Vo_.n₁d_.0e_.s₁ig₄n_/g₈o_/0al₂s
and limited characterization. They may change without notice. Contact Raytheon for current information.