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Электронный компонент: LP2951WG/883

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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 (75A 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, or metal can pack-
ages 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 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
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
LP2951
00854625
00854601
May 2003
LP2950/LP2951
Series
of
Adjustable
Micropower
V
oltage
Regulators
2003 National Semiconductor Corporation
DS008546
www.national.com
Connection Diagrams
TO-92 Plastic Package (Z)
00854602
Bottom View
Dual-In-Line Packages (N, J)
Surface-Mount Package (M, MM)
00854626
Top View
Metal Can Package (H)
00854619
Top View
10-Lead Ceramic Surface-Mount Package (WG)
00854664
Top View
TO-252 (D-Pak)
00854670
Front View
8-Lead LLP
00854671
Pin 4 is fused to center DAP
Top View
LP2950/LP2951
www.national.com
2
Ordering Information
Package
Temperature
Range
Part Number
Package Marking
Transport Media
NSC Drawing
TO-92 (Z)
-40
<
T
J
<
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
TO-252
(D-Pak)
-40
<
T
J
<
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
N (N-08E)
-40
<
T
J
<
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
M (M08A)
-40
<
T
J
<
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
MM
(MUA08A)
-40
<
T
J
<
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
J (J08A)
-55
<
T
J
<
150
LP2951J/883
See MIL/AERO
Datasheet
40 Units/Rail
J08A
H (H08C)
-55
<
T
J
<
150
LP2951H/883
See MIL/AERO
Datasheet
Tray
H08C
WG
(WG10A)
-55
<
T
J
<
150
LP2951WG/883
See MIL/AERO
Datasheet
Tray
WG10A
LP2950/LP2951
www.national.com
3
Ordering Information
(Continued)
Package
Temperature
Range
Part Number
Package Marking
Transport Media
NSC Drawing
8-lead LLP
-40
<
T
J
<
125
LP2951ACLD-3.0
L002A
1k Units Tape and Reel
LDA08A
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
LP2950/LP2951
www.national.com
4
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
J
)
+150C
Ambient Storage Temperature
-65 to +150C
Soldering Dwell Time, Temperature
Wave
Infrared
Vapor Phase
4 seconds, 260C
10 seconds, 240C
75 seconds, 219C
ESD Rating
Human Body Model(Note 18)
2500V
Operating Ratings
(Note 1)
Maximum Input Supply Voltage
30V
Junction Temperature Range
(T
J
) (Note 8)
LP2951
-55 to +150C
LP2950AC-XX, LP2950C-XX,
LP2951AC-XX, LP2951C-XX
-40 to +125C
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
J
= 25C
3.0
3.015
3.0
3.015
3.0
3.030
V max
2.985
2.985
2.970
V min
-25C
T
J
85C
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
100A
I
L
100mA
3.0
3.045
3.0
3.042
3.0
3.072
V max
T
J
T
JMAX
2.955
2.958
2.928
V min
3.3V Versions (Note 17)
Output Voltage
T
J
= 25C
3.3
3.317
3.3
3.317
3.3
3.333
V max
3.284
3.284
3.267
V min
-25C
T
J
85C
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
100A
I
L
100mA
3.3
3.350
3.3
3.346
3.3
3.379
V max
T
J
T
JMAX
3.251
3.254
3.221
V min
5V Versions (Note 17)
Output Voltage
T
J
= 25C
5.0
5.025
5.0
5.025
5.0
5.05
V max
4.975
4.975
4.95
V min
-25C
T
J
85C
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
100A
I
L
100mA
5.0
5.075
5.0
5.075
5.0
5.12
V max
T
J
T
JMAX
4.925
4.925
4.88
V min
LP2950/LP2951
www.national.com
5