rc2951mt Fairchild Semiconductor, rc2951mt Datasheet

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rc2951mt

Manufacturer Part Number
rc2951mt
Description
Adjustable Micropower Voltage Regulator
Manufacturer
Fairchild Semiconductor
Datasheet
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
Block Diagram
PRELIMINARY INFORMATION describes products that are not in full production at the time of printing. Specifications are based on design goals
and limited characterization. They may change without notice. Contact Raytheon for current information.
RC2951
Adjustable Micropower Voltage Regulator
CMOS
or TTL
From
+
Unregulated DC
3
Down
Shut
Error Detection Comparator
60 mV
+
7
Feed-
Back
1.23V
Reference
+
+
+
8
Input
Error
Amplifier
Output
1
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.
Ground
Sense
V
Error
TAP
I
L
2
6
5
4
≤ 100 mA
V
OUT
330kΩ
+
www.fairchildsemi.com
To CMOS
or TTL
See Application
Discussion
REV. 1.0.1 4/8/02

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rc2951mt Summary of contents

Page 1

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 ...

Page 2

RC2951 Pin Assignments Absolute Maximum Ratings Power Dissipation Lead Temp. (Soldering, 5 seconds) Storage Temperature Range Operating Junction Temperature Range Input Supply/Voltage 2,3 Feedback Input Voltage 2 Shutdown Input Voltage Error Comparator Output Voltage Notes: 1. Junction to ambient thermal ...

Page 3

PRODUCT SPECIFICATION Electrical Characteristics The • denotes that the limits apply at temperature extremes. Parameter Conditions 3 Dropout Voltage I I Ground Current I I Dropout Ground Current V I Current Limit V 8 Thermal Regulation Output Noise ...

Page 4

RC2951 Electrical Characteristics The • denotes that the limits apply at temperature extremes. Parameter Conditions Shutdown Input Input Logic Voltage Low (Regulator ON) High (Regulator OFF) Shutdown Pin Input Current V V Regulator Output 6 Current in Shutdown Notes: 1. ...

Page 5

PRODUCT SPECIFICATION Applications Discussion The RC2951 regulator is designed with internal current lim- iting and thermal shutdown not internally compensated and requires a 1.0µF (or greater) capacitor between the out- put terminal and ground for stability. At lower ...

Page 6

RC2951 . +V IN 100K Error ERROR Output RC2951 3 **Shutdown SD Input GND 4 ** Drive with TTL-high to shut down. Ground or leave open if shutdown feature is not to be used. The complete ...

Page 7

PRODUCT SPECIFICATION Typical Applications Unregulated Input Unregulated Input 8 IN OUT RC2951 6 SENSE V TAP FB GND 4 7 Figure 4. 300 mA Regulator with 0.75 Dropout REV. 1.0.1 4/8/02 1µF 0.01µF 10kΩ Supertex VP12C ...

Page 8

RC2951 Typical Applications (continued SENSE OUT V TAP RC2951 # ERROR 7 GND 4 27kΩ D 2.7MΩ SENSE IN ...

Page 9

PRODUCT SPECIFICATION Typical Applications (continued Lead-Acid Battery *Optional Latch off when drop out occurs. Adjust R3 for C2 Switching when V **Outputs go low whenV drops below designated thresholds. in Figure 12. Regulator with State-of-Charge Indicator For values ...

Page 10

RC2951 Mechanical Dimensions – 8 Lead SOIC Inches Millimeters Symbol Min. Max. Min. A .053 .069 1.35 A1 .004 .010 0.10 B .013 0.33 .020 C .008 .010 0.20 D .189 .197 4.80 E .150 .158 3.81 e .050 BSC ...

Page 11

... RC2951 Ordering Information Product Number RC2951MT 8-pin SOIC in tape and reel RC2951M33 8-pin SOIC DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; ...

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