LP2951ACM-3.0 National Semiconductor, LP2951ACM-3.0 Datasheet

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LP2951ACM-3.0

Manufacturer Part Number
LP2951ACM-3.0
Description
Manufacturer
National Semiconductor
Datasheet

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LP2951ACM-3.0
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© 2005 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 (75µA typ.) and very low
dropout voltage (typ. 40mV at light loads and 380mV at
100mA). 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, LLP, 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
resistors.
Careful design of the LP2950/LP2951 has minimized all
contributions to the error budget. This includes a tight initial
tolerance (.5% typ.), extremely good load and line regulation
Block Diagram and Typical Applications
LP2950
DS008546
00854625
(.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 100mA 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 (10mΩ to 6Ω)
LP2951 versions only
n Error flag warns of output dropout
n Logic-controlled electronic shutdown
n Output programmable from 1.24 to 29V
LP2951
www.national.com
May 2005
00854601

Related parts for LP2951ACM-3.0

LP2951ACM-3.0 Summary of contents

Page 1

... This includes a tight initial tolerance (.5% typ.), extremely good load and line regulation Block Diagram and Typical Applications LP2950 © 2005 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. ...

Page 2

Connection Diagrams TO-92 Plastic Package (Z) Bottom View Dual-In-Line Packages (N, J) Surface-Mount Package (M, MM) Top View Metal Can Package (H) Top View 10-Lead Ceramic Surface-Mount Package (WG) Top View www.national.com 00854602 00854626 Pin 4 is fused to center ...

Page 3

... LP2950CDTX-3.0 LP2950CDT-3.3 LP2950CDTX-3.3 LP2950CDT-5.0 LP2950CDTX-5.0 < < N (N-08E) −40 T 125 LP2951ACN-3.0 J LP2951CN-3.0 LP2951ACN-3.3 LP2951CN-3.3 LP2951ACN LP2951CN < < M (M08A) −40 T 125 LP2951ACM-3.0 J LP2951ACMX-3.0 LP2951CM-3.0 LP2951CMX-3.0 LP2951ACM-3.3 LP2951ACMX-3.3 LP2951CM-3.3 LP2951CMX-3.3 LP2951ACM LP2951ACMX LP2951CM LP2951CMX < < MM −40 T 125 LP2951ACMM-3.0 J (MUA08A) LP2951ACMMX-3.0 LP2951CMM-3.0 LP2951CMMX-3.0 LP2951ACMM-3.3 LP2951ACMMX-3 ...

Page 4

Ordering Information Package Temperature Part Number Range < < 8-lead −40 T 125 LP2951ACSD-3.0 J LLP LP2951ACSDX-3.0 LP2951CSD-3.0 LP2951CSDX-3.0 LP2951ACSD-3.3 LP2951ACSDX-3.3 LP2951CSD-3.3 LP2951CSDX-3.3 LP2951ACSD LP2951ACSDX LP2951CSD LP2951CSDX www.national.com (Continued) Package Marking 51AC30 51AC30B 51AC33 51AC33B 2951AC 2951ACB 4 Transport Media ...

Page 5

... 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 6

Electrical Characteristics Conditions Parameter (Note 2) Temperature Range 100µA ≤ I ≤ Output Voltage L 100mA ≤ JMAX All Voltage Options Output Voltage (Note 12) Temperature Coefficient NOM + 1)V ≤ Line Regulation (V O ≤ 30V ...

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Electrical Characteristics Conditions Parameter (Note 2) All Voltage Options Temperature Coefficient Feedback Pin Bias Current Temperature Coefficient Error Comparator Output Leakage V = 30V OH Current Output Low NOM − 0.5)V Voltage I = 400µA ...

Page 8

Electrical Characteristics Note 10: When used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be diode-clamped to ground. ≥ 2V, V ≤ 30V, V Note 11 Feedback ...

Page 9

Typical Performance Characteristics Quiescent Current Input Current Output Voltage vs. Temperature of 3 Representative Units Dropout Characteristics 00854627 00854629 Quiescent Current 00854631 9 00854628 Input Current 00854630 00854632 www.national.com ...

Page 10

Typical Performance Characteristics Quiescent Current Quiescent Current Dropout Voltage www.national.com (Continued) Quiescent Current 00854633 Short Circuit Current 00854635 00854637 10 00854634 00854636 Dropout Voltage 00854638 ...

Page 11

Typical Performance Characteristics LP2951 Minimum Operating Voltage LP2951 Feedback Pin Current LP2951 Comparator Sink Current (Continued) LP2951 Feedback Bias Current 00854639 LP2951 Error Comparator Output 00854641 Line Transient Response 00854643 11 00854640 00854642 00854644 www.national.com ...

Page 12

Typical Performance Characteristics Load Transient Response LP2951 Enable Transient Ripple Rejection www.national.com (Continued) Load Transient Response 00854645 Output Impedance 00854647 00854649 12 00854646 00854648 Ripple Rejection 00854650 ...

Page 13

Typical Performance Characteristics Ripple Rejection LP2951 Divider Resistance Line Regulation (Continued) LP2951 Output Noise 00854651 Shutdown Threshold Voltage 00854653 LP2951 Maximum Rated Output Current 00854655 13 00854652 00854654 00854656 www.national.com ...

Page 14

Typical Performance Characteristics LP2950 Maximum Rated Output Current Output Capacitor ESR Range www.national.com (Continued) Thermal Response 00854657 00854663 14 00854658 ...

Page 15

Application Hints EXTERNAL CAPACITORS A 1.0µF (or greater) capacitor is required between the output and ground for stability at output voltages more. At lower output voltages, more capacitance is required (2.2µF or more is recommended for 3V ...

Page 16

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 Typical Applications 300mA Regulator ...

Page 17

Typical Applications (Continued) Low Drift Current Source 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 j Operation: Reg. ...

Page 18

Typical Applications 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 (Continued) 2 Ampere Low Dropout Regulator ...

Page 19

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 Voltage **Sets disconnect ...

Page 20

Typical Applications LM34 for 125˚F Shutdown LM35 for 125˚C Shutdown www.national.com (Continued) System Overtemperature Protection Circuit 20 00854618 ...

Page 21

21 www.national.com ...

Page 22

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted Order Number LP2951WG/883 NS Package Number WG10A Metal Can Package (H) NS Package Number H08C 22 ...

Page 23

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Ceramic Dual-In-Line Package (J) NS Package Number J08A Surface Mount Package (M) NS Package Number M08A 23 www.national.com ...

Page 24

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) NS Package Number N08E Molded TO-92 Package (Z) NS Package Number Z03A 24 ...

Page 25

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Surface Mount Package (MM) NS Package Number MUA08A D-Pak Package NS Package Number TD03B 25 www.national.com ...

Page 26

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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