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PDF LP2950 Data sheet ( Hoja de datos )
| Número de pieza | LP2950 | |
| Descripción | (LP2950 / LP2951) Series of Adjustable Micropower Voltage Regulators | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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 1. PDF - Adjustable Voltage Regulator  Hay una vista previa y un enlace de descarga de LP2950 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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May 2005
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
(.05% typ.) and a very low output voltage temperature coef-
ficient, making the part useful as a low-power voltage refer-
ence.
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/
Features
n 5V, 3V, and 3.3V versions available
LP2951 increases only slightly in dropout, prolonging battery n High accuracy output voltage
life. n Guaranteed 100mA output current
The LP2950-5.0 is available in the surface-mount D-Pak n Extremely low quiescent current
package, and in the popular 3-pin TO-92 package for pin- n Low dropout voltage
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
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)
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
LP2951 versions only
programmed from 1.24V to 29V with an external pair of n Error flag warns of output dropout
resistors.
n Logic-controlled electronic shutdown
Careful design of the LP2950/LP2951 has minimized all n Output programmable from 1.24 to 29V
contributions to the error budget. This includes a tight initial
tolerance (.5% typ.), extremely good load and line regDualattaioSnheet4U.com
Block Diagram and Typical Applications
LP2950
LP2951
DataShee
00854625
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© 2005 National Semiconductor Corporation
DS008546
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1 page  
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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
SHUTDOWN Input Voltage,
Error Comparator Output
Voltage, (Note 9)
FEEDBACK Input Voltage
(Note 9) (Note 10)
Power Dissipation
Junction Temperature (TJ)
Ambient Storage Temperature
Soldering Dwell Time, Temperature
Wave
Infrared
Vapor Phase
−0.3 to +30V
−1.5 to +30V
Internally Limited
+150˚C
−65˚ to +150˚C
4 seconds, 260˚C
10 seconds, 240˚C
75 seconds, 219˚C
ESD Rating
Human Body Model(Note 18)
2500V
Operating Ratings (Note 1)
Maximum Input Supply Voltage
Junction Temperature Range
(TJ) (Note 8)
LP2951
LP2950AC-XX, LP2950C-XX,
LP2951AC-XX, LP2951C-XX
30V
−55˚ to +150˚C
−40˚ to +125˚C
Electrical Characteristics (Note 2)
Parameter
Conditions
(Note 2)
3V Versions (Note 17)
et4U.com Output Voltage
TJ = 25˚C
−25˚C ≤ TJ ≤ 85˚C
Full Operating
Temperature
Range
Output Voltage
100µA ≤ IL ≤
100mA
TJ ≤ TJMAX
3.3V Versions (Note 17)
Output Voltage
TJ = 25˚C
−25˚C ≤ TJ ≤ 85˚C
Full Operating
Temperature
Range
Output Voltage
100µA ≤ IL ≤
100mA
TJ ≤ TJMAX
5V Versions (Note 17)
Output Voltage
TJ = 25˚C
−25˚C ≤ TJ ≤ 85˚C
Full Operating
LP2951
Tested
Typ Limit
(Notes 3, 16)
LP2950AC-XX
LP2951AC-XX
Tested Design
Typ Limit Limit
(Note 3) (Note 4)
LP2950C-XX
LP2951C-XX
Tested Design
Typ Limit Limit
(Note 3) (Note 4)
3.0 3.015 3.0 3.015
3.0 3.030
2.985
2.985
2.970
3.0 DataSh3e.0et4U.com 3.030 3.0
3.045
2.970
2.955
3.0 3.036 3.0
3.036 3.0
3.060
2.964
2.964
2.940
3.045
3.0 3.0
2.955
3.042
2.958
3.0
3.072
2.928
3.3 3.317 3.3 3.317
3.3 3.333
3.284
3.284
3.267
3.3 3.3 3.333 3.3 3.350
3.267
3.251
3.3 3.340 3.3
3.340 3.3
3.366
3.260
3.260
3.234
3.350
3.3 3.3
3.251
3.346
3.254
3.3
3.379
3.221
5.0 5.025 5.0 5.025
5.0 5.05
4.975
4.975
4.95
5.0
5.0
5.05 5.0
5.075
4.95
4.925
5.0 5.06 5.0
5.06 5.0
5.1
Units
V max
V min
V max
V min
V max
V min
V max
V min
V max
V min
V max
V min
V max
V min
V max
V min
V max
V min
V max
V min
V max
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Typical Performance Characteristics (Continued)
LP2951 Minimum Operating Voltage
LP2951 Feedback Bias Current
00854639
LP2951 Feedback Pin Current
00854640
LP2951 Error Comparator Output
et4U.com
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00854641
LP2951 Comparator Sink Current
00854642
Line Transient Response
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| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LP2950.PDF ] | |
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