NSC LP2951CM-3.3, LP2951CM-3.0, LP2951CM, LP2951CN-3.3, LP2951CN-3.0 Datasheet

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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 (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 onlyslightly 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 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 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

Block Diagram and Typical Applications

LP2950

DS008546-25

LP2951

DS008546-1

January 2000

LP2950/LP2951 Series of Adjustable Micropower Voltage Regulators

Connection Diagrams

TO-92 Plastic Package (Z)

DS008546-2

Bottom View

Dual-In-Line Packages (N, J)

Surface-Mount Package (M, MM)

DS008546-26

Top View

Metal Can Package (H)

DS008546-19

Top View

10-Lead Ceramic Surface-Mount Package (WG)

DS008546-64

Top View

TO-252 (D-Pak)

DS008546-70

Front View

LP2950/LP2951

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Ordering Information

Package Output Voltage Temperature

3.0V 3.3V 5.0V (˚C)

TO-92 (Z) LP2950ACZ-3.0 LP2950ACZ-3.3 LP2950ACZ-5.0 −40

125

LP2950CZ-3.0 LP2950CZ-3.3 LP2950CZ-5.0

TO-252 (D-Pak) LP2950CDT-5.0 −40

125

N (N-08E) LP2951ACN-3.0 LP2951ACN-3.3 LP2951ACN −40

125

LP2951CN-3.0 LP2951CN-3.3 LP2951CN

M (M08A) LP2951ACM-3.0 LP2951ACM-3.3 LP2951ACM −40

125

LP2951CM-3.0 LP2951CM-3.3 LP2951CM

MM (MUA08A) LP2951ACMM-3.0 LP2951ACMM-3.3 LP2951ACMM −40

125

LP2951CMM-3.0 LP2951CMM-3.3 LP2951CMM

J (J08A) LP2951ACJ −40

125

LP2951CJ

LP2951J −55

150 LP2951J/883 5926-3870501MPA

H (H08C) LP2951H/883 −55

150 5962-3870501MGA

WG (WG10A) LP2951WG/883 −55

150 5962-3870501MXA

Package Marking for MM Package:

Order Number Package Marking

LP2951ACMM L0DA LP2951CMM L0DB LP2951ACMM-3.3 L0CA LP2951CMM-3.3 L0CB LP2951ACMM-3.0 L0BA LP2951CMM-3.0 L0BB

LP2950/LP2951

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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

ESD TBD

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

Electrical Characteristics (Note 2)

Parameter

Conditions

(Note 2)

LP2951 LP2950AC-XX LP2950C-XX

Units

LP2951AC-XX LP2951C-XX

Tested Tested Design Tested Design

Typ Limit Typ Limit Limit Typ Limit Limit

(Notes 3, 16) (Note 3) (Note 4) (Note 3) (Note 4) 3V VERSIONS (Note 17) Output Voltage T

25˚C 3.0 3.015 3.0 3.015 3.0 3.030 V max

2.985 2.985 2.970 V min

−25˚C ≤ T

≤ 85˚C 3.0 3.0 3.030 3.0 3.045 V max

2.970 2.955 V min Full Operating 3.0 3.036 3.0 3.036 3.0 3.060 V max Temperature Range 2.964 2.964 2.940 V min

Output Voltage 100 µA ≤ I

≤ 100 mA 3.0 3.045 3.0 3.042 3.0 3.072 V max

≤ T

JMAX

2.955 2.958 2.928 V min

3.3V VERSIONS (Note 17)

Output Voltage T

25˚C 3.3 3.317 3.3 3.317 3.3 3.333 V max

3.284 3.284 3.267 V min

−25˚C ≤ T

≤ 85˚C 3.3 3.3 3.333 3.3 3.350 V max

3.267 3.251 V min Full Operating 3.3 3.340 3.3 3.340 3.3 3.366 V max Temperature Range 3.260 3.260 3.234 V min

Output Voltage 100 µA ≤ I

≤ 100 mA 3.3 3.350 3.3 3.346 3.3 3.379 V max

≤ T

JMAX

3.251 3.254 3.221 V min

5V VERSIONS (Note 17)

Output Voltage T

25˚C 5.0 5.025 5.0 5.025 5.0 5.05 V max

4.975 4.975 4.95 V min

−25˚C ≤ T

≤ 85˚C 5.0 5.0 5.05 5.0 5.075 V max

4.95 4.925 V min Full Operating 5.0 5.06 5.0 5.06 5.0 5.1 V max Temperature Range 4.94 4.94 4.9 V min

Output Voltage 100 µA ≤ I

≤ 100 mA 5.0 5.075 5.0 5.075 5.0 5.12 V max

≤ T

JMAX

4.925 4.925 4.88 V min

ALL VOLTAGE OPTIONS

Output Voltage Temperature Coefficient

(Note 12) 20 120 20 100 50 150 ppm/˚C

Line Regulation (Note 14)

NOM + 1)V ≤ Vin≤ 30V

(Note 15)

0.03 0.1 0.03 0.1 0.04 0.2

max

0.5 0.2 0.4

max

Load Regulation (Note 14)

100 µA ≤ I

≤ 100 mA 0.04 0.1 0.04 0.1 0.1 0.2

max

0.3 0.2 0.3

max

LP2950/LP2951

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Electrical Characteristics (Note 2) (Continued)

Parameter

Conditions

(Note 2)

LP2951 LP2950AC-XX LP2950C-XX

Units

LP2951AC-XX LP2951C-XX

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

Dropout Voltage (Note 5)

100 µA 80 80 80 mV max

50 150 50 150 50 150 mV max

100 mA 450 450 450 mV max

380 600 380 600 380 600 mV max

Ground I

100 µA 75 120 75 120 75 120 µA max

Current 140 140 140 µA max

100 mA 8 12 8 12 8 12 mA max

14 14 14 mA max

Dropout V

NOM − 0.5)V 110 170 110 170 110 170 µA max

Ground Current I

100 µA 200 200 200 µA max

Current Limit V

out

0 160 200 160 200 160 200 mA max

220 220 220 mA max

Thermal Regulation (Note 13) 0.05 0.2 0.05 0.2 0.05 0.2

/W max

Output Noise, C

1 µF (5V Only) 430 430 430 µV rms

10 Hz to 100 kHz C

200 µF 160 160 160 µV rms

3.3 µF (Bypass=0.01 µF 100 100 100 µV rms Pins 7 to 1 (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 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

NOM − 0.5)V 150 250 150 250 150 250 mV max

Voltage I

400 µA 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 ON) 0.6 0.7 0.7 V max Voltage High (Regulator OFF) 2.0 2.0 2.0 V min

LP2950/LP2951

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Electrical Characteristics (Note 2) (Continued)

Parameter

Conditions

(Note 2)

LP2951 LP2950AC-XX LP2950C-XX

Units

LP2951AC-XX LP2951C-XX

Tested Tested Design Tested Design

Typ Limit Typ Limit Limit Typ Limit Limit

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

Shutdown Input

Shutdown Pin Input Current

shutdown

2.4V 30 50 30 50 30 50 µA max 100 100 100 µA max

shutdown

30V 450 600 450 600 450 600 µA max

750 750 750 µA max

Regulator Output Current in Shutdown

(Note 11) 3 10 3 10 3 10 µA max

20 20 20 µA max

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

ONOM

+ 1)V, I

100 µA and C

1 µF for 5V versions and 2.2 µF for 3V and 3.3V versions.

Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for T

A=TJ

= 25˚C. Additional

conditions for the 8-pin versions are FEEDBACK tied to V

TAP

, OUTPUT tied to SENSE, and V

SHUTDOWN

≤ 0.8V.

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

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

out/Vref

(R1 + R2)/R2. For example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235V=384 mV. Thresholds remain constant as a percent of V

out

as V

out

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

Note 7: V

ref

≤ V

out

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

JMAX

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.

Note 9: May exceed input supply voltage. 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

shutdown

≥ 2V, Vin≤ 30V, V

out

0, Feedback pin tied to V

TAP

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

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

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

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 at150˚CforI

1 mA. For I

100 µAandT

125˚C, line regulation isguaranteedbydesignto0.2%. SeeTypical

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).

Typical Performance Characteristics

Quiescent Current

DS008546-27

Dropout Characteristics

DS008546-28

Input Current

DS008546-29

LP2950/LP2951

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Typical Performance Characteristics (Continued)

Input Current

DS008546-30

Output Voltage vs. Temperature of 3 Representative Units

DS008546-31

Quiescent Current

DS008546-32

Quiescent Current

DS008546-33

Quiescent Current

DS008546-34

Quiescent Current

DS008546-35

Short Circuit Current

DS008546-36

Dropout Voltage

DS008546-37

Dropout Voltage

DS008546-38

LP2950/LP2951

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