LP2951BCS [FCI]
150mA Low Drop Out Voltage Regulators; 150毫安低压差稳压器
| 型号： | LP2951BCS |
| 厂家： | 
FIRST COMPONENTS INTERNATIONAL |
| 描述： | 150mA Low Drop Out Voltage Regulators |
| 文件： | 总8页 (文件大小：384K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LP2950/LP2951 150mA Low Drop Out Voltage Regulators
PRODUCTDESCRIPTION
The LP2950 and LP2951 are
low power voltage regulators. These
devices are an excellent choice for
use in battery powered applications
such as cordless telephone, radio
control systems, and portable
computers.
The LP2950 and LP2951
feature very low quiescent current
(75µA Typ.) and very low drop
output voltage (Typ. 40µV at light
load and 380mV at 100mA). This
includes a tight initial tolerance of
0.5% typ., extremely good load and
line regulation 0.05% typ. and very
low output temperature coefficient,
making the LP2950/LP2951 useful
as a low power voltage reference.
Other key additional feature of this
unregulated input voltage transient of
-20V below ground (reverse battery).
switched on and off. The LP2950 is
offered in 3-pin TO-92 package
compatible with other
5
volt
regulators. The LP2951 is available
in 8-pin plastic, SOP-8 package.
The regulator output voltage
may be pin-strapped for a 5 volt of
programmed from 1.24 volt to 29
volts with external pair of resistors.
Using of as design, processing and
testing techniques make our LP2950
and LP2951 superior over similar
products.
The error flag output feature is
used as power-on reset for warn of a
low output voltage, due to following
batteries on input. Other feature is
the logic compatible shutdown input
which enabled\s the regulator to be
APPLICATIONS
FEATURES
l
l
l
l
l
l
l
l
l
l
Battery powered systems
Cordless telephones
l
l
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l
l
l
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Output accuracy 5V, 150mA output
Very low quiescent current
Radio control systems
Portable/Palmtop/Notebook computers
Portable consumer equipment
Portable instrumentation
Avionics
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Need only 1µF for stability
Unregulated DC input can withstand -20V reverse
battery and +60V positive transients
Direct replacement for LP2950/LP2951 sockets
Automotive electronics
SMPS Post-Regulator
Voltage reference
l
LP2951 VERSIONS ONLY
PINARRANGEMENT
TO
l
l
l
Error flag warns of output dropout
Logic-Controlled electronic shutdown
Output programmable from 1.24 to 29V
PIN: 1. OUTPUT
2. SENSE
3. SHUTDOWN
4. GROUND
5. ERROR
ORDERINGINFORMATION
TO-92
3-PIN
LP2950CT
LP2950ACT
LP2950BCT
PLASTIC
SOP 8-PIN
OPER.
TEMP.
IND.
IND.
IND.
6. 5V TAP
7. FEEDBACK
8. INPUT
PIN: 1. OUTPUT
2. GND
SOP-8
3. INPUT
LP2951CS
LP2951ACS
LP2951BCS
IND.
IND.
IND.
3-1
LP2950/LP2951 150mA Low Drop Out Voltage Regulators
ABSOLUTEMAXIMUMRATINGS
Power Dissipation ....................... Internally Limited
Lead Temp. (Soldering, 5 Seconds) ................ 260oC
Storage Temperature Range .............. -65 to +150oC
Operating Junction Temperature Range
Input Supply Voltage ..............................-20 to +60V
Feedback Input Voltage ........................ -1.5 to +30V
Shutdown Input Voltage ....................... -0.3 to +30V
Error Comparator Output ................... -0.3 to +30V
ECD Rating is to be determined
LP2951 ................................................ -55 to +150oC
LP2950BC/LP2950AC/LP2950C
LP2951BC/LP2951AC/LP2951C ... -40 to +125oC
ELECTRICAL CHARACTERISTICS (Vin = 15V, TA = 25oC unless otherwise noted)
PARAMETER
CONDITIONS
(Note 2)
LP2950BC
LP2951BC
LP2950AC
LP2951AC
LP2950C
LP2951C
UNITS
Min
Typ
Max Min Typ
Max Min
Typ
Max
o
Output Voltage
Output Voltage
T
J
= 25 C
4.98
4.95
4.94
5.0
5.02
5.05
5.06
4.975
4.95
4.94
5.0
5.025
5.05
5.06
4.95
4.93
4.94
5.0
5.05
5.075
5.085
V
V
o
o
-25 C < T < 85 C
Full Operating Temp.
J
100µA < I < 100mA
4.93
5.07
4.93
5.07
4.925
5.075
L
T
J
< T
JMAX
o
Output Voltage
Temperature Coefficient
(Note 1)
20
20
50
0.04
0.1
ppm/ C
Line Regulation
(Note 3)
6V < V < 30V
in
(Note 4)
0.03
0.04
0.2
0.1
0.03
0.04
0.2
0.1
0.2
0.2
%
%
Load Regulation
(Note 3)
100µA < I < 100mA
L
Dropout Voltage
(Note 5)
I
L
I
L
I
L
= 100µA
= 100mA
= 150mA
40
250
300
80
300
450
40
250
300
80
300
450
40
250
300
80
300
450
mV
mV
mV
Ground Current
I
L
I
L
I
L
= 100µA
= 100mA
= 150mA
75
1.7
4
120
2.5
6
75
1.7
4
120
2.5
6
75
1.7
4
120
2.5
6
µA
mA
mA
Dropout Ground
Current
V
= 4.5V
110
170
110
170
110
170
µA
in
= 100µA
I
L
Current Limit
V
out
= 0
160
200
0.2
160
200
0.2
160
200
0.2
mA
%W
Thermal Regulation
0.05
0.05
0.05
Output Noise,
10Hz to 100kHz
C
= 1µF
= 200µF
= 13.3µF
430
160
100
430
160
100
430
160
100
µVms
L
I
I
L
L
(Bypass = 0.01µF pins 7
to 1 (LP2951))
8-Pin Versions only
Reference Voltage
Reference Voltage
LP2951BC
1.235
LP2951AC
1.235
LP2951C
1.235
1.22
1.19
1.25
1.27
40
1.22
1.19
1.25
1.27
40
1.216
1.18
1.254
1.28
40
V
V
Over Temp. (Note 6)
(Note 7)
Feedback Pin Bias
Current
20
20
20
20
20
50
nA
o
Reference Voltage
Temperature
ppm/ C
Coefficient
o
Feedback Pin Bias
Current Temperature
Coefficient
0.1
0.1
0.1
nA/ C
3-2
LP2950/LP2951 150mA Low Drop Out Voltage Regulators
PARAMETER
CONDITIONS
(Note 2)
LP2950BC
LP2951BC
LP2950AC
LP2951AC
LP2950C
LP2951C
Typ
UNITS
Min
Typ
Max Min Typ
Max Min
Max
ERROR Comparator
Output Leakage Current
Output Low Voltage
V
V
= 30V
0.01
150
1
0.01
150
1
1
µA
oh
in
= 4.5V
250
250
150
250
mV
I
= 400µA
ol
Upper Threshold Voltage
Power Threshold Voltage
Hysteresis
(Note 8)
(Note 8)
(Note 8)
40
60
75
15
40
60
75
15
40
60
75
15
mV
mV
mV
95
95
95
Shutdown Input
Output Logic Voltage
Low (Regulator ON)
High (Regulator OFF)
1.3
0.7
1.3
0.7
1.3
0.7
V
2
2
2
Shutdown Pin Input
Current
V
V
= 2.4V
= 30V
30
450
50
600
30
450
50
600
30
450
50
600
µA
µA
S
S
Regulator Output Current
in Shutdown
V
= 0
3
10
3
10
3
00
out
Note 1: Output or reference voltage temperature coefficients
defined as the worst case voltage change divided by the total
temperature range.
supply voltage of 2V (2.3V over temperature) must be taken
into account.
Note 6: Vref < Vout < (Vin-1V), 2.3V < Vin < 30V,
100µA < IL < 100mA, TJ < TJMAX.
Note 2: Unless otherwise specified all limits guaranteed for
TJ=25oC, Vin=6V, IL=100µA and CL=100µF. Additional
conditions for the 8-pin versions are feedback tied to 5V tap
output Sense (Vout=5V) and Vshutdown<0.8V.
Note 7: Output or reference voltage temperature coefficient
is defined as the worst case voltage change divided by the
total temperature range.
Note 3: 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 8: Comparator thresholds are expressed in terms of a
voltage differential at the feedbackterminal below the
nominal reference voltage measured at 6V input . To
express these thresholds in terms of output voltage change,
Note 4: Line regulation for the LP2951 is tested at 150oC
for IL=1mA. For IL=100µA and TJ=150oC, line regulation is
guaranteed by design to 0.2%. See typical performance
characteristics for line regulation versus temperature and
load current.
multiply
by
the
error
amplifier
gain=Vout/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 95mV X 5V/1.235=384mV.
Thresholds remain constant as a percent of Vout as Vout is
varied with the dropout warning occuring at typically 5%
below nominal, 7.5% guaranteed.
Note 5: Dropout Voltage is defined as the input to output
differential at which the output voltage drops 100mV below
its nominal value measured at 1V differential at very low
value of programmed output voltage, the minimum input
Note 9: Vshutdown>2V, Vin < 30V, Vout = 0, Feedback pin tied to
5V Tap.
3-3
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