LP2950ACN-X Calogic LLC, LP2950ACN-X Datasheet

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LP2950ACN-X

Manufacturer Part Number
LP2950ACN-X
Description
100mA Low Dropout Voltage Regulators
Manufacturer
Calogic LLC
Datasheet
1.LP2950ACN-X.pdf (10 pages)
FEATURES
LP2951 Versions Only
APPLICATIONS
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CORPORATION
PIN CONNECTIONS
5V, 3.3V, and 3.0V Versions at 100mA Output
Very Low Quiescent Current
Low Dropout Voltage
Extremely Tight Load and Line Regulation
Very Low Temperature Coefficient
Current and Thermal Limiting
Needs Only 1 F for Stability
Error Flag Warns of Output Dropout
Logic-Controlled Electronic Shutdown
Output Programmable from 1.24 to 29V
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
SHUTDOWN
GROUND
OUTPUT
SENSE
8-PIN SURFACE MOUNT
1
2
3
4
TOP VIEW
LP2951
8
7
6
5
INPUT
FEEDBACK
5V OR 3.3V TAP
ERROR
1D-19
PRODUCT DESCRIPTION
The Calogic 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 features very low quiescent current and very low
dropout voltage (Typ. 50mV at light load and 380mV at 100mA).
This includes a tight initial tolerance of 0.5% typ., extremely
good load and line regulation 0.05% typ. and very low output
temperature coefficient, making the LP2950/LP2951 useful
as a low-power voltage reference.
The error flag output feature is used as power-on reset for
warning of a low output voltage, due to falling voltage input of
batteries. Another feature is the logic-compatible shutdown
input which enables the regulator to be switched on and off.
The LP2950 is offered in a 3-pin TO-92 package compatible
with other 5V, 3.0V, 3.3V regulators. The LP2951 is also available
in 8-pin plastic and SO-8.
The regulator output voltage may be pin-strapped for 5V, 3V
or 3.3 volts or programmed from 1.24 volt to 29 volts with an
external pair of resistors. Use of AS’s design, processing and
testing techniques make our LP2950 and LP2951 superior
over similar products.
ORDERING INFORMATION
PART
LP2950ACN-X
LP2950CN-X
LP2951ACP-X
LP2951CP-X
LP2951ACS-X
LP2951CS-X
X = 3.0V, 3.3V or 5.0V
BOTTOM VIEW
1
100mA Low Dropout
TO-92
Voltage Regulators
2
PACKAGE
TO-92 (3-Pin)
TO-92 (3-Pin)
Plastic DIP (8-Pin)
Plastic DIP (8-Pin)
Plastic SOIC (8-Pin)
Plastic SOIC (8-Pin)
3
LP2950 / LP2951
1. OUTPUT
2. GROUND
3. INPUT
TEMPERATURE RANGE
1D-20
IND.
IND.
IND.
IND.
IND.
IND.

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LP2950ACN-X Summary of contents

Page 1

... The regulator output voltage may be pin-strapped for 5V 3.3 volts or programmed from 1.24 volt to 29 volts with an external pair of resistors. Use of AS’s design, processing and testing techniques make our LP2950 and LP2951 superior over similar products. ORDERING INFORMATION PART LP2950ACN-X LP2950CN-X LP2951ACP-X LP2951CP-X LP2951ACS-X LP2951CS 3.0V, 3.3V or 5.0V ...

Page 2

LP2950 / LP2951 ABSOLUTE MAXIMUM RATINGS Power Dissipation . . . . . . . . . . . . . . . . . . . . . Internally Limited Lead Temp. (Soldering, 5 Seconds ...

Page 3

CORPORATION ELECTRICAL CHARACTERISTICS (continued) LP2951 PARAMETER MIN TYP ERROR COMPARATOR Output Leakage Current 0.01 Output Low Voltage 150 Upper Threshold Voltage 40 60 Lower Threshold Voltage 75 Hysteresis 15 SHUTDOWN INPUT 1.3 Input Logic Voltage 2 Shutdown Pin 30 Input ...

Page 4

LP2950 / LP2951 APPLICATION HINTS EXTERNAL CAPACITORS The stability of the LP2950/LP2951 requires a 1 greater capacitor between output and ground. Oscillation could occur without this capacitor. Most types of tantalum or aluminum electrolytic are acceptable. For operations ...

Page 5

CORPORATION TYPICAL PERFORMANCE CHARACTERISTICS QUIESCENT CURRENT 10 1 0.1 0.01 0.1 1.0 10 100 LOAD CURRENT (mA) INPUT CURRENT 120 5V OUTPUT 110 100 ...

Page 6

LP2950 / LP2951 TYPICAL PERFORMANCE CHARACTERISTICS (continued) LP2951 MINIMUM OPERATING VOLTAGE 2.2 2.1 2.0 1.9 1.8 1.7 1.6 –75 –50 – 100 125 150 TEMPERATURE (˚C) LP2951 ERROR COMPARATOR OUTPUT OUT 6 ...

Page 7

CORPORATION TYPICAL APPLICATIONS 4.75V OUTPUT VOLTAGE ERROR* 5.0V INPUT VOLTAGE 1.3V *SEE APPLICATION INFO. FIGURE 1. ERROR OUTPUT TIMING + 470K + ERROR 470K LP2951 3 SD GND 4 LATCH OFF WHEN ERROR FLAG OCCURS CALOGIC ...

Page 8

LP2950 / LP2951 TYPICAL APPLICATIONS (continued 120K SEALED LEAD- ACID FB BATTERY SOURCE 400K FOR 5.5V 6V LEAD- ACID BATTERY *OPTIONAL LATCH OFF WHEN DROPOUT OCCURS. ADJUST R3 FOR C2 SWITCHING WHEN V CALOGIC CORPORATION, 237 Whitney Place, ...

Page 9

CORPORATION TYPICAL APPLICATIONS (continued) AUX SHUTDOWN INPUT OFF ON + TEMP AS35 SENSOR – 4 20mA IN4001 LP2951 0.1 F GND 4 MIN VOLTAGE = 4V OPEN CIRCUIT DETECTOR FOR 4mA TO 20mA CURRENT LOOP CALOGIC ...

Page 10

LP2950 / LP2951 SCHEMATIC DIAGRAM R11 20pF 20k Q42 R2 50k R5 R6 180 140 k k Q40 Q13 Q12 Q41 4 R30 30k R3 R4 50k 13k ERROR Q38 ...

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