LP2951CJ National Semiconductor, LP2951CJ Datasheet

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LP2951CJ

Manufacturer Part Number
LP2951CJ
Description
Series of Adjustable Micropower Voltage Regulators
Manufacturer
National Semiconductor
Datasheet
© 2000 National Semiconductor Corporation
LP2950/LP2951
Series of Adjustable Micropower Voltage Regulators
General Description
The LP2950 and LP2951 are micropower voltage regulators
with very low quiescent current (75 µA typ.) and very low
dropout voltage (typ. 40 mV at light loads and 380 mV at
100 mA). They are ideally suited for use in battery-powered
systems. Furthermore, the quiescent current of the LP2950/
LP2951 increases only slightly in dropout, prolonging battery
life.
The LP2950-5.0 is available in the surface-mount D-Pak
package, and in the popular 3-pin TO-92 package for
pin-compatibility with older 5V regulators. The 8-lead
LP2951 is available in plastic, ceramic dual-in-line, or metal
can packages and offers additional system functions.
One such feature is an error flag output which warns of a low
output voltage, often due to falling batteries on the input. It
may be used for a power-on reset. A second feature is the
logic-compatible shutdown input which enables the regulator
to be switched on and off. Also, the part may be pin-strapped
for a 5V, 3V, or 3.3V output (depending on the version), or
programmed from 1.24V to 29V with an external pair of re-
sistors.
Careful design of the LP2950/LP2951 has minimized all con-
tributions to the error budget. This includes a tight initial tol-
erance (.5% typ.), extremely good load and line regulation
Block Diagram and Typical Applications
LP2950
DS008546
DS008546-25
(.05% typ.) and a very low output voltage temperature coef-
ficient, making the part useful as a low-power voltage refer-
ence.
Features
n 5V, 3V, and 3.3V versions available
n High accuracy output voltage
n Guaranteed 100 mA output current
n Extremely low quiescent current
n Low dropout voltage
n Extremely tight load and line regulation
n Very low temperature coefficient
n Use as Regulator or Reference
n Needs minimum capacitance for stability
n Current and Thermal Limiting
n Stable with low-ESR output capacitors
LP2951 versions only
n Error flag warns of output dropout
n Logic-controlled electronic shutdown
n Output programmable from 1.24 to 29V
LP2951
January 2000
www.national.com
DS008546-1

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LP2951CJ Summary of contents

Page 1

... This includes a tight initial tol- erance (.5% typ.), extremely good load and line regulation Block Diagram and Typical Applications LP2950 © 2000 National Semiconductor Corporation (.05% typ.) and a very low output voltage temperature coef- ficient, making the part useful as a low-power voltage refer- ence. ...

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Connection Diagrams TO-92 Plastic Package (Z) Bottom View Metal Can Package (H) Top View TO-252 (D-Pak) Front View www.national.com Surface-Mount Package (M, MM) DS008546-2 10-Lead Ceramic Surface-Mount Package (WG) DS008546-19 DS008546-70 2 Dual-In-Line Packages (N, J) DS008546-26 Top View DS008546-64 ...

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... Package Marking for MM Package: Output Voltage 3.3V LP2950ACZ-3.3 LP2950ACZ-5.0 LP2950CZ-3.3 LP2950CZ-5.0 LP2950CDT-5.0 LP2951ACN-3.3 LP2951ACN LP2951CN-3.3 LP2951CN LP2951ACM-3.3 LP2951ACM LP2951CM-3.3 LP2951CM LP2951CMM-3.3 LP2951CMM LP2951ACJ LP2951CJ LP2951J LP2951J/883 5926-3870501MPA LP2951H/883 5962-3870501MGA LP2951WG/883 5962-3870501MXA Order Number Package Marking LP2951ACMM L0DA LP2951CMM L0DB LP2951ACMM-3.3 L0CA LP2951CMM-3.3 L0CB LP2951ACMM-3.0 L0BA LP2951CMM-3 ...

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... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Supply Voltage SHUTDOWN Input Voltage, Error Comparator Output Voltage, (Note 9) FEEDBACK Input Voltage (Note 9) (Note 10) Power Dissipation Junction Temperature ( Ambient Storage Temperature ...

Page 5

Electrical Characteristics Conditions Parameter (Note 2) ALL VOLTAGE OPTIONS = 100 µA Dropout Voltage I L (Note 5) = 100 100 µA Ground I L Current = 100 Dropout V NOM ...

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Electrical Characteristics Conditions Parameter (Note 2) Shutdown Input = 2.4V Shutdown Pin Input V shutdown Current = 30V V shutdown Regulator Output (Note 11) Current in Shutdown Note 1: Absolute Maximum Ratings are limits beyond which damage to the device ...

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Typical Performance Characteristics Input Current DS008546-30 Quiescent Current DS008546-33 Short Circuit Current DS008546-36 (Continued) Output Voltage vs. Temperature of 3 Representative Units DS008546-31 Quiescent Current DS008546-34 Dropout Voltage DS008546-37 7 Quiescent Current DS008546-32 Quiescent Current DS008546-35 Dropout Voltage DS008546-38 www.national.com ...

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Typical Performance Characteristics LP2951 Minimum Operating Voltage DS008546-39 LP2951 Error Comparator Output DS008546-42 Load Transient Response DS008546-45 www.national.com (Continued) LP2951 Feedback Bias Current DS008546-40 LP2951 Comparator Sink Current DS008546-43 Load Transient Response DS008546-46 8 LP2951 Feedback Pin Current DS008546-41 Line ...

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Typical Performance Characteristics Output Impedance DS008546-48 Ripple Rejection DS008546-51 Shutdown Threshold Voltage DS008546-54 LP2950 Maximum Rated Output Current DS008546-57 (Continued) Ripple Rejection DS008546-49 LP2951 Output Noise DS008546-52 Line Regulation DS008546-55 Thermal Response DS008546-58 9 Ripple Rejection DS008546-50 LP2951 Divider Resistance ...

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Application Hints EXTERNAL CAPACITORS A 1.0 µF (or greater) capacitor is required between the out- put and ground for stability at output voltages more. At lower output voltages, more capacitance is required (2.2 µF or more is ...

Page 11

Application Hints (Continued) * See Application Hints ** Drive with TTL-high to shut down. Ground or leave open if shutdown feature is not to be used. Note: Pins 2 and 6 are left open. FIGURE 2. Adjustable Regulator REDUCING OUTPUT ...

Page 12

Typical Applications 300 mA Regulator with 0.75V Dropout Low Drift Current Source www.national.com 1A Regulator with 1.2V Dropout Wide Input Voltage Range Current Limiter DS008546-21 * Minimum input-output voltage ranges from 400 mV, depending on load current. ...

Page 13

Typical Applications (Continued) Regulator with Early Warning and Auxiliary Output j Early warning flag on low input voltage j Main output latches off at lower input voltages j Battery backup on auxiliary output Operation: Reg. # 1’ programmed ...

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Typical Applications (Continued) For 5V , use internal resistors. Wire pin & wire pin out 5V Regulator with 2.5V Sleep Function * High input lowers V to 2.5V out www.national.com 2 Ampere Low Dropout ...

Page 15

Typical Applications (Continued) * Optional Latch off when drop out occurs. Adjust R3 for C2 Switching when V ** Outputs go low when V drops below designated thresholds. in For values shown, Regulator shuts down when V * Sets disconnect ...

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Typical Applications (Continued) LM34 for 125˚F Shutdown LM35 for 125˚C Shutdown www.national.com System Overtemperature Protection Circuit 16 DS008546-18 ...

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Schematic Diagram 17 www.national.com ...

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Physical Dimensions www.national.com inches (millimeters) unless otherwise noted Order Number LP2951WG/883 or 5962-3870501MXA NS Package Number WG10A Metal Can Package (H) Order Number LP2951H/883 or 5962-3870501MGA NS Package Number H08C 18 ...

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... Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Order Number LP2951CJ, LP2951ACJ, LP2951J, LP2951J/883 or 5962-3870501MPA Order Number LP2951ACM, LP2951CM, LP2951ACM-3.0, LP2951CM-3.0, LP2951ACM-3.3 or LP2951CM-3.3 Ceramic Dual-In-Line Package (J) NS Package Number J08A Surface Mount Package (M) NS Package Number M08A 19 www.national.com ...

Page 20

Physical Dimensions Order Number LP2951ACN, LP2951CN, LP2951ACN-3.0, Order Number LP2950ACZ-3.0 or LP2950CZ-3.0, LP2950ACZ-3.3, www.national.com inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) LP2951CN-3.0, or LP2951ACN-3.3 or LP2951CN-3.3 NS Package Number N08E Molded TO-92 Package (Z) LP2950CZ-3.3, LP2950ACZ-5.0 or ...

Page 21

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Order Number LP2951ACMM, LP2951CMM, LP2951ACMM-3.0, LP2951CMM-3.0, LP2951ACMM-3.3 or LP2951CMM-3.3 Surface Mount Package (MM) NS Package Number MUA08A D-Pak Package Order Number LP2950CDT-5.0 NS Package Number TD03B 21 www.national.com ...

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... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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