LP2950AC Advanced Monolithic Systems, LP2950AC Datasheet

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LP2950AC

Manufacturer Part Number
LP2950AC
Description
100mA LOW DROPOUT VOLTAGE REGULATOR
Manufacturer
Advanced Monolithic Systems
Datasheet

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FEATURES
ADDITIONAL FEATURES (LP2951 ONLY)
GENERAL DESCRIPTION
The LP2950 and LP2951 are micropower voltage regulators ideally suited for use in battery-powered systems. These devices
feature very low quiescent current (typ.75µA), and very low dropout voltage (typ.45mV at light loads and 380mV at 100mA)
thus prolonging battery life. The quiescent current increases only slightly in dropout. The LP2950/LP2951 has positive
transient protection up to 60V and can survive unregulated input transient up to 20V below ground.
The LP2950 and LP2951 were designed to include a tight initial tolerance (typ. 0.5%), excellent load and line regulation (typ.
0.05%), and a very low output voltage temperature coefficient, making these devices useful as a low-power voltage reference.
The LP2950 is offered in the 3-pin TO-92 package. LP2951 is available in 8-pin plastic SOIC and DIP packages and offers
three major additional system features. An error flag output warns of a low output voltage, often due to failing batteries on
input. The LP2951 also features the logic-compatible shutdown input which enables the regulator to be switched on and off.
The LP2951 device may be pin-strapped for a 5V, 3.3V, or 3V output, or programmed from 1.24V to 29V with an external
pair of resistors.
ORDERING INFORMATION
Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
5V, 3.3V, and 3V Versions at 100mA Output Current
High Accuracy Output Voltage
Extremely Low Quiescent Current
Low Dropout Voltage
Extremely Tight Load and Line Regulation
Very Low Temperature Coefficient
Current and Thermal Limiting
Needs Minimum Capacitance (1 F) for Stability
Unregulated DC Positive Transients 60V
1.24V to 29V Programmable Output
Error Flag Warning of Voltage Output Dropout
Logic Controlled Electronic Shutdown
X = 3.3V, or 3V
Advanced
Monolithic
Systems
LP2950ACN-X LP2951ACP-X LP2951ACS-X
LP2950CN-X
TO-92
PACKAGE TYPE
8 LEAD PDIP
LP2951CP-X
8 LEAD SOIC
LP2951CS-X
TEMP. RANGE
OPERATING
100mA LOW DROPOUT VOLTAGE REGULATOR
IND.
IND
APPLICATIONS
Battery Powered Systems
Portable Consumer Equipment
Cordless Telephones
Portable (Notebook) Computers
Portable Instrumentation
Radio Control Systems
Automotive Electronics
Avionics
Low-Power Voltage Reference
LP2950/LP2951
SHUTDOWN
GROUND
OUTPUT
OUTPUT
SENSE
PIN CONNECTION
GND
8L SOIC/ 8L PDIP
Bottom View
1
2
3
4
Top View
TO-92
8
7
6 V
5
ERROR
INPUT
FEEDBACK
INPUT
TAP

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LP2950AC Summary of contents

Page 1

... The LP2951 device may be pin-strapped for a 5V, 3.3V output, or programmed from 1.24V to 29V with an external pair of resistors. ORDERING INFORMATION PACKAGE TYPE TO-92 8 LEAD PDIP LP2950ACN-X LP2951ACP-X LP2951ACS-X LP2950CN-X LP2951CP 3.3V Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 100mA LOW DROPOUT VOLTAGE REGULATOR ...

Page 2

... Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 (Note 1) -0.3 to +30V ESD -1.5 to +30V OPERATING RATINGS Internally Limited Max. Input Supply Voltage +150 C Junction Temperature Range - +150 C LP2950AC-XX, LP2950C-XX LP2951AC-XX, LP2951C- =Vout+1V, Ta=25°C, unless otherwise noted LP2950AC Conditions LP2951AC (Note 2) Min. (Note 3) 2.985 2.970 2 ...

Page 3

... Note 12: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range. Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 (Note 2) (Continued) LP2950AC CONDITIONS LP2951AC (Note 2) Min. Typ. ...

Page 4

... UNREGULATED DC + INPUT OUTPUT + - ERROR AMPLIFIER + 1.23V REFERENCE GROUND Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 =30V (1.25W pulse) for T =10 ms mA. For I = 100 A and T = 125 C, line regulation is guaranteed by design to 0.2%. See UNREGULATED ...

Page 5

... OUTPUT I = 100 A 110 100 -50 - 100 125 -75 TEMPERATURE (° C) Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 Dropout Characteristics 6 5V OUTPUT 100 ...

Page 6

... RESISTOR TO V OUT INPUT VOLTAGE (V) Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 (Continued) Dropout Voltage 600 500 400 300 ~ ~ 100 50 0 150 -75 -50 - 100 125 TEMPERATURE (° C) ...

Page 7

... OUT FREQUENCY (Hz) Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 (Continued) Load Transient Response - -40 V OUT - 100 mA 100 ...

Page 8

... TEMPERATURE (° C) LP2950 Maximum Rated Output Current 120 100 INPUT VOLTAGE (V) Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 (Continued) Line Regulation 150° 125° ...

Page 9

... It goes high at about 5V input (the input voltage at which Vout = 4.75 ). Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 Since the LP2951’s dropout voltage is load dependent (see curve in typical performance characteristics), the input voltage trip point (about 5V) will vary with the load current ...

Page 10

... V SENSE TAP FB GND 7 4 Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 *See Application Hints. out V out **Drive with TTL- high to shut down. Ground or leave if shutdown feature is not used. Note: Pins 2 and 6 are left open. ...

Page 11

... OUPUT LP2951 SHUTDOWN 3 SD INPUT GND Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 30V 1 0 *Minimum Input-Output voltage ranges from 40mV to 400mV, depending on load current. Current limit is typically 160 OUT ...

Page 12

... OUT 1A Regulator with 1.2V Dropout UNREGULATED INPUT SENSE TAP LP2951 7 FB OUT GND 4 Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 0.05 MJE2955 + 10k OUT ERROR + + FLAG 100 TANT Early warning flag on low input voltage Main output latches off at lower input voltages Buss ...

Page 13

... SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 3 LEAD TO-92 PLASTIC PACKAGE (N) 0.180±0.005 (4.572± ...

Page 14

... DO NOT INCLUDE MOLD FLASH OR PROTUSIONS. MOLD FLASH OR PROTUSIONS SHALL NOT EXCEED 0.010" (0.254mm) Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140 8 LEAD PLASTIC DIP PACKAGE (P) 0.400* MAX ...

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