NSC LP2951J Datasheet
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, 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
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 2003
Block Diagram and Typical Applications
LP2950 LP2951
00854625
00854601
© 2003 National Semiconductor Corporation DS008546 www.national.com
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
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
<
<
<
−40
<
<
−55<T
T
J
T
J
T
J
T
J
T
J
T
J
T
J
J
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 2951ACM30DD 95 Units/Rail M08A
LP2951ACMX-3.0 2.5k Units Tape and Reel
LP2951CM-3.0 2951CM30DD 95 Units/Rail
LP2951CMX-3.0 2.5k Units Tape and Reel
LP2951ACM-3.3 2951ACM33DD 95 Units/Rail
LP2951ACMX-3.3 2.5k Units Tape and Reel
LP2951CM-3.3 2951CM33DD 95 Units/Rail
LP2951CMX-3.3 2.5k Units Tape and Reel
LP2951ACM 2951ACMDD 95 Units/Rail
LP2951ACMX 2.5k Units Tape and Reel
LP2951CM 2951CMDD 95 Units/Rail
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
<
150 LP2951H/883 See MIL/AERO
Datasheet
<
150 LP2951WG/883 See MIL/AERO
Datasheet
40 Units/Rail J08A
Tray H08C
Tray WG10A
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Ordering Information (Continued)
Package Temperature
8-lead LLP −40<T
LP2950/LP2951
Part Number Package Marking Transport Media NSC Drawing
Range
<
125 LP2951ACLD-3.0 L002A 1k Units Tape and Reel LDA08A
J
LP2951ACLDX-3.0 4.5k Units Tape and Reel
LP2951CLD-3.0 L002B 1k Units Tape and Reel
LP2951CLDX-3.0 4.5k Units Tape and Reel
LP2951ACLD-3.3 L003A 1k Units Tape and Reel
LP2951ACLDX-3.3 4.5k Units Tape and Reel
LP2951CLD-3.3 L003B 1k Units Tape and Reel
LP2951CLDX-3.3 4.5k Units Tape and Reel
LP2951ACLD-5.0 L027A 1k Units Tape and Reel
LP2951ACLDX-5.0 4.5k Units Tape and Reel
LP2951CLD-5.0 L027B 1k Units Tape and Reel
LP2951CLDX-5.0 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
J
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)
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
Output Voltage 100µA ≤ I
Conditions
(Note 2)
= 25˚C 3.0 3.015 3.0 3.015 3.0 3.030 V max
J
−25˚C ≤ T
≤ 85˚C 3.0 3.0 3.030 3.0 3.045 V max
J
Typ Limit Typ Limit Limit Typ Limit Limit
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
≤ 100mA 3.0 3.045 3.0 3.042 3.0 3.072 V max
L
T
≤ T
J
JMAX
= 25˚C 3.3 3.317 3.3 3.317 3.3 3.333 V max
J
−25˚C ≤ T
≤ 85˚C 3.3 3.3 3.333 3.3 3.350 V max
J
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
≤ 100mA 3.3 3.350 3.3 3.346 3.3 3.379 V max
L
T
≤ T
J
JMAX
= 25˚C 5.0 5.025 5.0 5.025 5.0 5.05 V max
J
−25˚C ≤ T
≤ 85˚C 5.0 5.0 5.05 5.0 5.075 V max
J
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
≤ 100mA 5.0 5.075 5.0 5.075 5.0 5.12 V max
L
T
≤ T
J
JMAX
ESD Rating
Human Body Model(Note 18) 2500V
Operating Ratings (Note 1)
Maximum Input Supply Voltage 30V
Junction Temperature Range
(T
) (Note 8)
J
LP2951 −55˚ to +150˚C
LP2950AC-XX, LP2950C-XX,
LP2951AC-XX, LP2951C-XX −40˚ to +125˚C
LP2951 LP2950AC-XX LP2950C-XX
LP2951AC-XX LP2951C-XX
Tested Tested Design Tested Design
(Notes 3, 16) (Note 3) (Note 4) (Note 3) (Note 4)
2.985 2.985 2.970 V min
2.970 2.955 V min
2.955 2.958 2.928 V min
3.284 3.284 3.267 V min
3.267 3.251 V min
3.251 3.254 3.221 V min
4.975 4.975 4.95 V min
4.95 4.925 V min
4.925 4.925 4.88 V min
Units
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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)
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 ≤ Vin≤
(V
O
30V (Note 15)
100µA ≤ I
I
= 100µA 80 80 80 mV max
L
I
= 100mA 450 450 450 mV max
L
≤ 100mA 0.04 0.1 0.04 0.1 0.1 0.2 % max
L
0.03 0.1 0.03 0.1 0.04 0.2 % max
0.5 0.2 0.4 % 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
L
Current 140 140 140 µA max
I
= 100mA 8 12 8 12 8 12 mA max
L
14 14 14 mA max
Dropout V
Ground Current I
Current Limit V
=(VONOM − 0.5)V 110 170 110 170 110 170 µA max
in
= 100µA 200 200 200 µA max
L
= 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 max
Output Noise, C
10 Hz to 100 kHz C
= 1µF (5V Only) 430 430 430 µV rms
L
= 200µF 160 160 160 µV rms
L
C
= 3.3µF
L
(Bypass = 0.01µF 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
OH
Current 222µA max
Output Low V
Voltage I
=(VONOM − 0.5)V 150 250 150 250 150 250 mV max
in
= 400µA 400 400 400 mV max
OL
LP2951AC-XX LP2951C-XX
Units
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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)
Error Comparator
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
Shutdown Pin Input
Current
V
shutdown
V
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
Limits 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
O
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.
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
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
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.
out
≤ V
ref
shutdown
out
(Note 11) 3 10 3 10 3 10 µA max
20 20 20 µA max
=(V
IN
, OUTPUT tied to SENSE, and V
TAP
as V
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
JA
≥ 2V, Vin≤ 30V, V
= 0, Feedback pin tied to V
out
= 30V (1.25W pulse) for T = 10ms.
IN
= 1mA. For IL= 100µA and TJ= 125˚C, line regulation is guaranteed by design to 0.2%. See Typical
L
+ 1)V, IL= 100µA and CL= 1µF for 5V versions and 2.2µF for 3V and 3.3V versions.
ONOM
JMAX
.
TAP
#
LP2951AC-XX LP2951C-XX
SHUTDOWN
.
5962-3870501MGA, MXA, or MPA.
≤ 0.8V.
out/Vref
Units
= 25˚C. Additional
A=TJ
= (R1 + R2)/R2.For example, at a
in
=
LP2950/LP2951
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Typical Performance Characteristics
Quiescent Current Dropout Characteristics
LP2950/LP2951
00854627
Input Current Input Current
00854629
Output Voltage vs. Temperature of 3
Representative Units Quiescent Current
00854628
00854630
00854631
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00854632
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