National Semiconductor LP2950, LP2951 Technical data

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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 pincompatibility 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

(.05% typ.) and a very low output voltage temperature coefficient, making the part useful as a low-power voltage reference.

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

LP2950/LP2951 Series of Adjustable Micropower Voltage Regulators

May 2005

Block Diagram and Typical Applications

LP2950 LP2951

00854625

00854601

Connection Diagrams

TO-92 Plastic Package (Z)

LP2950/LP2951

TO-252 (D-Pak)

Bottom View

00854602

Dual-In-Line Packages (N, J)

Surface-Mount Package (M, MM)

00854626

Top View

Metal Can Package (H)

Front View

00854670

8-Lead LLP

00854671

Pin 4 is fused to center DAP

Top View

00854619

10-Lead Ceramic Surface-Mount Package (WG)

Top View

00854664

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Ordering Information

LP2950/LP2951

Package Temperature

Range

−40

−55

TO-92 (Z) −40

TO-252 (D-Pak)

N (N-08E) −40

M (M08A) −40

MM (MUA08A)

J (J08A) −55

H (H08C) −55

WG (WG10A)

Part Number Package Marking Transport Media NSC Drawing

125 LP2950ACZ-3.0 2950A CZ3.0 Bag Z03A

LP2950CZ-3.0 2950 CZ3.0 Bag

LP2950ACZ-3.3 2950A CZ3.3 Bag

LP2950CZ-3.3 2950 CZ3.3 Bag

LP2950ACZ-5.0 2950A CZ5.0 Bag

LP2950CZ-5.0 2950 CZ5.0 Bag

125 LP2950CDT-3.0 LP2950CDT-3.0 75 Units/Rail TD03B

LP2950CDTX-3.0 2.5k Units Tape and Reel

LP2950CDT-3.3 LP2950CDT-3.3 75 Units/Rail

LP2950CDTX-3.3 2.5k Units Tape and Reel

LP2950CDT-5.0 LP2950CDT-5.0 75 Units/Rail

LP2950CDTX-5.0 2.5k Units Tape and Reel

125 LP2951ACN-3.0 LP2951ACN-3.0 40 Units/Rail N08E

LP2951CN-3.0 LP2951CN-3.0 40 Units/Rail

LP2951ACN-3.3 LP2951ACN-3.3 40 Units/Rail

LP2951CN-3.3 LP2951CN-3.3 40 Units/Rail

LP2951ACN LP2951ACN 40 Units/Rail

LP2951CN LP2951CN 40 Units/Rail

125 LP2951ACM-3.0 2951ACM30*

LP2951ACMX-3.0 2.5k Units Tape and Reel

LP2951CM-3.0 2951CM30*

LP2951CMX-3.0 2.5k Units Tape and Reel

LP2951ACM-3.3 2951ACM33*

LP2951ACMX-3.3 2.5k Units Tape and Reel

LP2951CM-3.3 2951CM33*

LP2951CMX-3.3 2.5k Units Tape and Reel

LP2951ACM 2951ACM*

LP2951ACMX 2.5k Units Tape and Reel

LP2951CM 2951CM*

LP2951CMX 2.5k Units Tape and Reel

125 LP2951ACMM-3.0 L0BA 1k Units Tape and Reel MUA08A

LP2951ACMMX-3.0 3.5k Units Tape and Reel

LP2951CMM-3.0 L0BB 1k Units Tape and Reel

LP2951CMMX-3.0 3.5k Units Tape and Reel

LP2951ACMM-3.3 L0CA 1k Units Tape and Reel

LP2951ACMMX-3.3 3.5k Units Tape and Reel

LP2951CMM-3.3 L0CB 1k Units Tape and Reel

LP2951CMMX-3.3 3.5k Units Tape and Reel

LP2951ACMM L0DA 1k Units Tape and Reel

LP2951ACMMX 3.5k Units Tape and Reel

LP2951CMM L0DB 1k Units Tape and Reel

LP2951CMMX 3.5k Units Tape and Reel

150 LP2951J/883 See MIL/AERO Datasheet 40 Units/Rail J08A

150 LP2951H/883 See MIL/AERO Datasheet Tray H08C

150 LP2951WG/883 See MIL/AERO Datasheet Tray WG10A

(where * is die rev letter)

95 Units/Rail M08A

95 Units/Rail

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Ordering Information (Continued)

Package Temperature

8-lead

LP2950/LP2951

LLP

−40<T

Part Number Package Marking Transport Media NSC Drawing

Range

125 LP2951ACSD-3.0 51AC30 1k Units Tape and Reel SDC08A

LP2951ACSDX-3.0 4.5k Units Tape and Reel

LP2951CSD-3.0 51AC30B 1k Units Tape and Reel

LP2951CSDX-3.0 4.5k Units Tape and Reel

LP2951ACSD-3.3 51AC33 1k Units Tape and Reel

LP2951ACSDX-3.3 4.5k Units Tape and Reel

LP2951CSD-3.3 51AC33B 1k Units Tape and Reel

LP2951CSDX-3.3 4.5k Units Tape and Reel

LP2951ACSD 2951AC 1k Units Tape and Reel

LP2951ACSDX 4.5k Units Tape and Reel

LP2951CSD 2951ACB 1k Units Tape and Reel

LP2951CSDX 4.5k Units Tape and Reel

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LP2950/LP2951

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Input Supply Voltage −0.3 to +30V

SHUTDOWN Input Voltage,

Error Comparator Output Voltage, (Note 9)

FEEDBACK Input Voltage −1.5 to +30V

(Note 9) (Note 10)

Power Dissipation Internally Limited

Junction Temperature (T

) +150˚C

Ambient Storage Temperature −65˚ to +150˚C

Soldering Dwell Time, Temperature

Wave Infrared Vapor Phase

4 seconds, 260˚C 10 seconds, 240˚C 75 seconds, 219˚C

Electrical Characteristics (Note 2)

LP2951 LP2950AC-XX LP2950C-XX

Parameter

3V Versions (Note 17)

Output Voltage T

Output Voltage 100µA ≤ I

3.3V Versions (Note 17)

Output Voltage T

Output Voltage 100µA ≤ I

5V Versions (Note 17)

Output Voltage T

Conditions

(Note 2)

Typ Limit Typ Limit Limit Typ Limit Limit

Tested Tested Design Tested Design

(Notes 3, 16) (Note 3) (Note 4) (Note 3) (Note 4)

= 25˚C 3.0 3.015 3.0 3.015 3.0 3.030 V max

−25˚C ≤ T

≤ 85˚C 3.0 3.0 3.030 3.0 3.045 V max

Full Operating 3.0 3.036 3.0 3.036 3.0 3.060 V max

Temperature Range

≤

100mA

TJ≤ T

JMAX

= 25˚C 3.3 3.317 3.3 3.317 3.3 3.333 V max

−25˚C ≤ T

≤ 85˚C 3.3 3.3 3.333 3.3 3.350 V max

3.0

Full Operating 3.3 3.340 3.3 3.340 3.3 3.366 V max

Temperature Range

≤

100mA

≤ T

JMAX

= 25˚C 5.0 5.025 5.0 5.025 5.0 5.05 V max

−25˚C ≤ T

≤ 85˚C 5.0 5.0 5.05 5.0 5.075 V max

3.3

Full Operating 5.0 5.06 5.0 5.06 5.0 5.1 V max

ESD Rating

Human Body Model(Note 18) 2500V

Operating Ratings (Note 1)

Maximum Input Supply Voltage 30V

Junction Temperature Range

) (Note 8)

LP2951 −55˚ to +150˚C

LP2950AC-XX, LP2950C-XX, LP2951AC-XX, LP2951C-XX −40˚ to +125˚C

LP2951AC-XX LP2951C-XX

Units

2.985 2.985 2.970 V min

2.970 2.955 V min

2.964 2.964 2.940 V min

3.045

3.0

2.955 2.958 2.928 V min

3.284 3.284 3.267 V min

3.260 3.260 3.234 V min

3.350

3.3

3.251 3.254 3.221 V min

4.975 4.975 4.95 V min

3.042

3.0

3.072 V max

3.267 3.251 V min

3.346

3.3

3.379 V max

4.95 4.925 V min

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Electrical Characteristics (Note 2) (Continued)

LP2951 LP2950AC-XX LP2950C-XX

Parameter

LP2950/LP2951

Conditions

(Note 2)

Tested Tested Design Tested Design

Typ Limit Typ Limit Limit Typ Limit Limit

(Notes 3, 16) (Note 3) (Note 4) (Note 3) (Note 4)

Temperature

4.94 4.94 4.9 V min

Range

Output Voltage 100µA ≤ I

100mA

≤ T

JMAX

≤

5.0

5.075

4.925 4.925 4.88 V min

All Voltage Options

Output Voltage

(Note 12) 20 120 20 100 50 150 ppm/˚C Temperature Coefficient

Line Regulation (Note 14)

Load Regulation (Note 14)

Dropout Voltage (Note 5)

NOM + 1)V ≤

≤ 30V (Note

15)

100µA ≤ I

≤

100mA

= 100µA 80 80 80 mV max

= 100mA 450 450 450 mV max

0.03 0.1 0.03 0.1 0.04 0.2 % max

0.5 0.2 0.4 % max

0.04 0.1 0.04 0.1 0.1 0.2 % max

0.3 0.2 0.3 % max

50 150 50 150 50 150 mV max

380 600 380 600 380 600 mV max

Ground I

= 100µA 75 120 75 120 75 120 µA max

Current 140 140 140 µA max

= 100mA 8 12 8 12 8 12 mA max

14 14 14 mA max

Dropout V

=(VONOM −

110 170 110 170 110 170 µA max

0.5)V

Ground Current I

Current Limit V

= 100µA 200 200 200 µA max

= 0 160 200 160 200 160 200 mA max

out

220 220 220 mA max

Thermal Regulation (Note 13) 0.05 0.2 0.05 0.2 0.05 0.2 %/W

Output Noise, C

= 1µF (5V

430 430 430 µV rms

Only)

10 Hz to 100 kHz C

= 200µF 160 160 160 µV rms

= 3.3µF

(Bypass = 0.01µF 100 100 100 µV rms

Pins7to1

(LP2951)

8-pin Versions Only LP2951 LP2951AC-XX LP2951C-XX

Reference 1.235 1.25 1.235 1.25 1.235 1.26 V max

Voltage 1.26 1.26 1.27 V max

1.22 1.22 1.21 V min

1.2 1.2 1.2 V min

Reference (Note 7) 1.27 1.27 1.285 V max

Voltage 1.19 1.19 1.185 V min

Feedback Pin 20 40 20 40 20 40 nA max

Bias Current 60 60 60 nA max

Reference Voltage (Note 12) 20 20 50 ppm/˚C

LP2951AC-XX LP2951C-XX

5.0

5.075

5.0

5.12 V max

Units

max

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Electrical Characteristics (Note 2) (Continued)

LP2951 LP2950AC-XX LP2950C-XX

Parameter

Conditions

(Note 2)

Tested Tested Design Tested Design

Typ Limit Typ Limit Limit Typ Limit Limit

(Notes 3, 16) (Note 3) (Note 4) (Note 3) (Note 4)

All Voltage Options

Temperature Coefficient

Feedback Pin Bias 0.1 0.1 0.1 nA/˚C

Current Temperature

Coefficient

Error Comparator

Output Leakage V

= 30V 0.01 1 0.01 1 0.01 1 µA max

Current 222µA max

Output Low V

=(VONOM −

150 250 150 250 150 250 mV max

0.5)V

Voltage I

= 400µA 400 400 400 mV max

Upper Threshold (Note 6) 60 40 60 40 60 40 mV min

Voltage 25 25 25 mV min

Lower Threshold (Note 6) 75 95 75 95 75 95 mV max

Voltage 140 140 140 mV max

Hysteresis (Note 6) 15 15 15 mV

Shutdown Input

Input 1.3 1.3 1.3 V

Logic Low (Regulator

0.6 0.7 0.7 V max

ON)

Voltage High (Regulator

2.0 2.0 2.0 V min

OFF)

Shutdown Pin Input Current

shutdown

= 2.4V 30 50 30 50 30 50 µA max

100 100 100 µA max

= 30V 450 600 450 600 450 600 µA max

750 750 750 µA max

Regulator Output Current in Shutdown

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables.

Note 2: Unless otherwise specified all limits guaranteed for V appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for T conditions for the 8-pin versions are FEEDBACK tied to V

Note 3: Guaranteed and 100% production tested.

Note 4: Guaranteed but not 100% production tested. These limits are not used to calculate outgoing AQL levels.

Note 5: Dropout Voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential.

At very low values of programmed output voltage, the minimum input supply voltage of 2V (2.3V over temperature) must be taken into account.

Note 6: Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal reference voltage measured at V (V

NOM + 1)V. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = V

programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95mV x 5V/1.235V = 384 mV. Thresholds remain constant as a percent of V

Note 7: V

Note 8: The junction-to-ambient thermal resistances are as follows: 180˚C/W and 160˚C/W for the TO-92 package with 0.40 inch and 0.25 inch leads to the printed

circuit board (PCB) respectively, 105˚C/W for the molded plastic DIP (N), 130˚C/W for the ceramic DIP (J), 160˚C/W for the molded plastic SOP (M), 200˚C/W for the molded plastic MSOP (MM), and 160˚C/W for the metal can package (H). The above thermal resistances for the N, J, M, and MM packages apply when the package is soldered directly to the PCB. Junction-to-case thermal resistance for the H package is 20˚C/W. Junction-to-case thermal resistance for the TO-252 package is 5.4˚C/W. The value of θ thermal vias. For details of thermal resistance and power dissipation for the LLP package, refer to Application Note AN-1187.

Note 9: May exceed input supply voltage.

as V

out

≤ V

ref

out

(Note 11) 3 10 3 10 3 10 µA max

20 20 20 µA max

=(V

, OUTPUT tied to SENSE, and V

TAP

is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.

out

≤ (Vin− 1V), 2.3V ≤ Vin≤ 30V, 100µA ≤ IL≤ 100mA, TJ≤ T

for the LLP package is typically 51˚C/W but is dependent on the PCB trace area, trace material, and the number of layers and

+ 1)V, IL= 100µA and CL= 1µF for 5V versions and 2.2µF for 3V and 3.3V versions. Limits

ONOM

LP2951AC-XX LP2951C-XX

≤ 0.8V.

JMAX

SHUTDOWN

= 25˚C. Additional

A=TJ

= (R1 + R2)/R2.For example, at a

out/Vref

Units

LP2950/LP2951

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Electrical Characteristics (Note 2) (Continued)

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.

Note 11: V

Note 12: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.

Note 13: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation

LP2950/LP2951

effects. Specifications are for a 50mA load pulse at V

Note 14: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation.

Note 15: Line regulation for the LP2951 is tested at 150˚C for I Performance Characteristics for line regulation versus temperature and load current.

Note 16: A Military RETS specification is available on request. At time of printing, the LP2951 RETS specification complied with the boldface limits in this column. The LP2951H, WG, or J may also be procured as Standard Military Drawing Spec #5962-3870501MGA, MXA, or MPA.

Note 17: All LP2950 devices have the nominal output voltage coded as the last two digits of the part number. In the LP2951 products, the 3.0V and 3.3V versions are designated by the last two digits, but the 5V version is denoted with no code at this location of the part number (refer to ordering information table).

Note 18: Human Body Model 1.5kΩ in series with 100pF.

shutdown

≥ 2V, Vin≤ 30V, V

= 0, Feedback pin tied to V

out

= 30V (1.25W pulse) for T = 10ms.

TAP

= 1mA. For IL= 100µA and TJ= 125˚C, line regulation is guaranteed by design to 0.2%. See Typical

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