LP2951ACS-L-5-0/TR [EXAR]
100mA, LOW DROPOUT VOLTAGE REGULATORS; 100mA时低压差稳压器型号: | LP2951ACS-L-5-0/TR |
厂家: | EXAR CORPORATION |
描述: | 100mA, LOW DROPOUT VOLTAGE REGULATORS |
文件: | 总16页 (文件大小:806K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LP2950/LP2951
100mA, LOW DROPOUT VOLTAGE REGULATORS
OCTOBER 6, 2008
REV. G
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• Lead Free, RoHS Compliant Packages:
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Now Available in Lead Free Packaging
UNREGULATED DC
5V
@
MAX
ꢀ00mA
ꢀ
7
8
+
INPUT
FEEDBACK
OUTPUT
2
SENSE
ꢀ80k
Ω
+
_
ꢂ
ERROR
ꢁ
FROM
CMOS OR
TTL
AMPLIFIER
ꢁꢁ0k
Ω
5V TAP
SHUTDOWN
+
ꢂ0 mV
ꢂ0k
Ω
ꢀµF
5
______
ERROR
.
+
+
_
.
ERROR DETECTION
COMPARATOR
TO CMOS OR
TTL
ꢀ.2ꢁV
+
ꢃ
REFERENCE
GROUND
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
© 2008 Exar Corporation
ꢀ
≤ ≤
µ ≤ ≤
≤
≤ ≤
µ ≤ ≤
≤
≤ ≤
µ ≤ ≤
µ
µ
µ
µ
µ
µ
µ
µ
µ
© 2008 Exar Corporation
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
2
LP2950/51
C
O
N
DITIONS
L
P2
9
5
1
A
C
L
P2
9
5
1
C
P
A
R
A
ME
T
E
R
(Note2)
Min. Typ.
Min. Typ. Max.
U
NITS
Max.
8-PinVersionsonly(Continued)
ReferenceVoltage
Temperature
Coefficient
20
50
p
p
m/°C
FeedbackPinBias
Current
0.1
0.1
nA/°C
Temperature
Coefficient
ErrorComparator
OutputLeakage
Current
V =30
V
0.0
1
1
0.0
1
1
μ
A
O
H
OutputLo
w
Voltage V =4.5
V
1
5
0
2
5
0
1
5
0
2
50
m
V
V
I
N
I L=4
0
0μ
A
O
UpperThreshold
(Note7)
(Note7)
(Note7)
40
6
0
40
6
0
m
Voltage
LowerThreshold
Voltage
75
15
95
75
15
95
mV
mV
Hysteresis
S
h
utdownIn
put
InputlogicVoltage
Low(RegulatorON)
1.3
30
0.7
50
10
1.3
0.7
V
High(RegulatorOFF)
2.0
2.0
V
ShutdownPinInput V =2.4V
30
50
μA
μA
S
Current
V =30V
675 800
675
800
S
RegulatorOutput
CurrentinShutdown
Thermal
(Note8)
3
3
10
μA
8PinSOIC
3PinTO-92
°C/W
128.4
Resistanceθ
JA
°C/W
131.
9
Note1: Outputorreferencevoltagetemperaturecoefficientsdefinedastheworstcasevoltagechangedividedbythetotaltemperaturerange.
Note2:UnlessotherwisespecifiedalllimitsguaranteedforT =25°C,V =6V,IL=1
0
0μAandC =1
μ
F. Additionalco
n
ditionsforthe8-pinversionsarefeedback
J
IN
L
tiedto5Vtapandoutputtiedtooutputsense(V T=5V)andV U WN ≤0.8V.
U
S
D
O
Note3:RegulationismeasuredatconstantjunctOiontemperature,HusTingpulsetestingwithalo
wd
utycycle. Changesinoutputvoltageduetoheatingeffectsare
coveredu
n
derthespecificationforthermalregulation.
Note4: LineregulationfortheLP2
9
5
1istestedatI =1
m
A. ForIL=1
0
0 μAandT =1
2
5°C,lineregulationisguaranteedbydesignto0.2%. Seetypical
L
J
performancecharacteristicsforlineregulationversustemperatureandloadcurrent.
Note5:Dro
p
o
utvoltageisdefinedastheinputtooutputdifferentialatwhichtheoutputvoltagedrops100m
V
belowitsn
o
minalvaluemeasuredat1
Vdifferential.At
verylo
w
valuesofprogrammedoutputvoltage,theminimumin
p
utsupplyvoltageof2V(2.3
Vovertemperature)mustbetakenintoaccount.
Note6:V E
≤
V
UT ≤(V -1V),2.3 ≤VIN≤3
0
V,1
0
0
μ
A≤I ≤1
0
0
m
A,T ≤TJM
.
R
O
IN
L
J
A
X
Note7:ComFparatorthresholdsareexpressedintermsofavoltagedifferentialatthefeedbackterminalbelowthen
o
minalreferencevoltagemeasuredat6Vin
p
ut. To
expressthesethresholdsintermsofoutputvoltagechange,multiplybytheerroramplifiergain=V UT/V F=(R +R )/R . Forexample,ataprogrammedoutput
O
R
E
1
2
2
voltageof5V,theerroroutputisguaranteedtogolo
wwhentheoutputdropsby95m
Vx5V/1.2
35=384mV.ThresholdsremainconstantasapercentofV UTasV U
O
O T
isvaried,withthedro
p
o
utwarningoccurringattypically5%below
n
o
minal,7.5%guaranteed.
Note8: V
WN ≥2V,V ≤3
0
V,V U =0,Feedbackpintiedto5
V
Tap.
S
H T
D
IN
O T
Note9: AlltUypiOcalvaluesarenotguaranteed.Thevaluecouldvaryfromlottolot.
© 2008 Exar Corporation
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
3
10
6
250
225
200
5
4
RL= 50k Ω
175
150
1
RL
=
3
2
125
RL=50kΩ
RL
=
100
75
0.1
50
25
0
1
0
0.01
0
1
2
3
4
5
6
7
8
9
10
0.1
1
10
100
0
1
2
3
4
5
6
INPUT VOLTAGE (VOLTS)
LOAD CURRENT (mA)
INPUT VOLTAGE (VOLTS)
Input Current
Quiescent Current
Dropout Characteristics
16
320
280
160
150
140
130
120
110
100
90
80
70
RL=50
Ω
VOUT = 5V
240
200
160
12
IL= 1mA
IL= 0
VIN = 6V
IL= 100mA
120
80
60
50
40
30
20
10
0
8
4
40
0
0
1
2
3
4
5
6
7
8
-75
-25
0
25 50 75 100 125 150
-50
0
1
2
3
4
5
6
7
8
9 10
INPUT VOLTAGE (VOLTS)
TEMPERATURE (ºC)
INPUT VOLTAGE (VOLTS)
Ground Current
Ground Current
Input Current
16
190
170
150
130
14
12
IL=100mA
VIN =6V
IL =100uA
1
0
8
6
4
2
0
-75 -50 -25
0
25 50 75 100 125 150
0
1
2
3
4
5
6
7
8
TEMPERATURE (ºC)
INPUT VOLTAGE
Ground Current
Quiescent Current
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
© 2008 Exar Corporation
4
600
500
400
300
170
160
150
140
130
120
110
IL= 100mA
500
400
300
100
~
~
200
TJ = 25ºC
100
0
50
0
IL= 100 µA
110
100µA
1mA
OUTPUT CURRENT
10mA
100mA
-75 -50 -25
0
25 50 75 100 125 150
-75 -50 -25
0
25 50 75 100 125 150
TEMPERATURE (ºC)
TEMPERATURE (ºC)
Drop-Out Voltage
Drop-Out Voltage
Short Circuit Current
8
6
4
2.5
2.0
100
mV
VOUT = 5V
TA = 125ºC
50
mV
0
1.5
1.0
TA = 25ºC
TA = -55ºC
CL= 1 µF
IL= 1mA
HYSTERESIS
-50
mV
~
VOUT = 5V
2
0
~
8V
0.5
0.0
6V
4V
PULLUP RESISTOR TO
SEPARATE 5V SUPPLY
-2
0
1
2
3
4
5
0
200
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
400
600
800
INPUT VOLTAGE (V)
OUTPUT LOW VOLTAGE (V)
TIME(µs)
Error Comparator Output
LP2951 Comparator Sink Current
Line Transient Response
10
90
80
90
80
IO= 100 µA
5
CL= 1µF
VIN = 6V
VOUT = 5V
IO= 1mA
2
70
70
60
50
40
30
20
IL = 1mA
IL= 0
IO= 100mA
1
60
50
40
0.5
0.2
VOUT = 5V
CL= 1 µF
0.1
0.05
IL= 100 µA
CL= 1 µF
VIN = 6V
VOUT = 5V
30
20
0.02
0.01
IL = 10mA
103
10 2
10 5
106
10 1
10 2
10 3
10 4
10 5
10 6
10
100
1K
FREQUENCY (Hz)
10K
100K
1M
10 1
10 4
FREQUENCY (Hz)
FREQUENCY (Hz)
Output Impedance
Ripple Rejection
Ripple Rejection
© 2008 Exar Corporation
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
5
20
50
0
2.3
PIN 7 DRIVEN BY EXTERNAL
SOURCE (REGULATOR RUN
OPEN LOOP)
10
-50
2.1
0
TA=1 25ºC
-100
-150
-200
-250
-10
TA= 25ºC
TA= 55ºC
1.9
-20
-30
1.7
-75 -50 -25
-75 -50 -25
0
25 50 75 100 125 150
-2.0
-1.5 -1.0 -0.5
0
0.5
1.0
0
25 50 75 100 125 150
TEMPEATURE (ºC)
FEEDBACK VOLTAGE (V)
TEMPERATURE
LP2951 Minimum Operating Voltage
LP2951 Feedback Bias Current
LP2951 Feedback Pin Current
250
200
150
80
60
40
7
CL= 1 µF
6
5
4
100
50
0
20
0
3
-20
2
1
0
IL = 10mA
VIN= 8V
CL = 10 µF
VOUT = 5V
-50
-40
CL= 1 µF
VOUT = 5V
-100
-60
CL= 10 µF
V OUT = 5V
~
~
~
~
100
mA
2
0
100
µA
100
100
µA
µA
-2
0
1
2
3
4
5
-100
0
100 200 300 400 500 600 700
0
4
8
12
16
20
TIME (ms)
TIME (us)
TIME (ms)
Load Transient Response
Load Transient Response
Enable Transient
120
400
300
200
120
8-PIN
TO-92 PACKAGE
MOLDED
0.25" LEADS SOLDERED
TO PC BOARD
DIP SOLDERED
TO PC BOARD
TJMAX = 125º C
100
80
100
80
VOUT = 5V
Vout=5V
TJMAX = 125 ºC
60
60
TA = 25ºC
40
TA=25 ºC
40
20
0
TA = 50ºC
100
0
TA= 85 ºC
20
0
TA = 85ºC
0
5
10
15
20
25
30
-75 -50 -25
0
25 50 75 100 125 150
0
5
10
15
20
25
30
INPUT VOLTAGE (V)
TEMPERATURE (ºC)
INPUT VOLTAGE (V)
LP2950 Maxium Rated Output
LP2951 Divider Resistance
LP2950 Maxium Rated Output Current
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
© 2008 Exar Corporation
6
µ
µ
µ
µ
µ
µ
µ
µ
µ
© 2008 Exar Corporation
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
7
µ
°
° Ω
µ
Ω
µ µ
µ
µ
µ
×
µ
Ω
µ µ
µ
µ µ µ µ
≅ π ×
µ
µ
µ µ
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
© 2008 Exar Corporation
8
+V IN
100K
8
+V IN
______
ERROR
ERROR
5
1.2
4
to
2
9V
1
OUTPUT
V OUT
LP2951
+
SHUTDOWN
INPUT
3
R1
3.3µF
SD
.01µF
FB
GND
7
4
1.23V
V REF
R2
+V
IN
+V
IN
470kΩ
8
+V
______
ERROR
IN
5
V OUT
1
8
V OUT
470kΩ
+V
______
ERROR
IN
5
ERROR
*V
= V
1
IN
OUT
OUTPUT
LP2951
V OUT
+
3
R1
1µF
LP2951
SD
FB
GND
4
3
SHUTDOWN
INPUT
RESET
SD
7
FB
GND
7
4
R2
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV to 400mV.
DEPENDING ON LOAD CURRENT. CURRENT LIMIT IS TYPICALLY 150mA
Rev G
© 2008 Exar Corporation
LP2950-5ꢀ Low Dropout Linear Regulators
9
+
6V
SEALED
1.5kΩ
120kΩ
LEAD-
8
ACID
1N457
BATTERY
SOURCE
+VIN
FB
SPX385
1
2
MAIN V+
OUT
V
LP2951
MEMORY V+
SENSE
400kΩ
+
FOR 5.5 V
3
20kΩ
1µF
SD
100kΩ
GND
4
NI-CAD
BACKUP
BATTERY
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
© 2008 Exar Corporation
ꢀ0
+V IN
8
ꢀ0K
Ω.
+V IN
_______
ERROR
5
ꢀ
5 DEGREE SHUTDOWN FLAG
ꢁ
AUX SHUTDOW
INPUT
.
SD
OFF
LP295ꢀ
ON
V
OUT
GND
FB
EXTERNAL CIRCUIT
PROTECTED FROM
ꢃ
7
OR
+
OVER TEMPERATURE
(V+ GOES OFF WHEN
TEMP > ꢀ25)
TEMP
SENSOR
ASꢁ5
-
RELAY
8.2K
Ω
+5V
ꢃ.7mA
UNREGULATED INPUT
ꢃ
20mA
8
OUTPUT
8
ꢁꢁ0K
Ω
IN
ꢀ
+V IN
2N5ꢃꢁ2
VOUT
(2)
ꢀ
V OUT
27K
Ω
LP295ꢀ
ꢀNꢃ00ꢀ
LP295ꢀ
2
5V
ꢂ
7
SENSE
0.ꢀµF
VTAP
FB
2
OUTPUT
FB
7
GND
+
ꢃ
ꢃ.7µF
LOAD
50mA
GND
ꢃ
ꢁꢂ0K
Ω
TO
ꢀNꢃ57
ꢁ00 mA
MIN VOLTAGE = ꢃV
042408 Rev F
LP2950-5ꢀ Low Dropout Linear Regulator
© 2008 Exar Corporation
ꢀꢀ
PACKAGE: 3 PIN TO-92
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
© 2008 Exar Corporation
ꢀ2
PACKAGE: 3 PIN TO-92 AMMO PACK
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
© 2008 Exar Corporation
ꢀ3
PACKAGE: 8 PIN NSOIC
© 2008 Exar Corporation
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
ꢀ4
ORDERING INFORMATION
Output
Voltage
Accuracy
Part Number
Package Shipping Status
Lead Free
ꢁ Pin TO-92
LP2950ACN-L-ꢁ-ꢁ
0.50%
ꢁ.ꢁV
ꢁ.ꢁV
Bulk
Active
Lead Free
ꢁ Pin TO-92
LP2950ACN-L-ꢁ-ꢁ/TR 0.50%
LP2950ACN-L-5-0 0.50%
LP2950ACN-L-5-0/TR 0.50%
Tape & Reel Active
Lead Free
ꢁ Pin TO-92
5.0V
Bulk
Active
Lead Free
ꢁ Pin TO-92
5.0V
Tape & Reel Active
Lead Free
ꢁ Pin TO-92
LP2950CN-L-ꢁ-ꢁ
ꢀ%
ꢀ%
ꢁ.ꢁV
Bulk
Active
Lead Free
ꢁ Pin TO-92
LP2950CN-L-ꢁ-ꢁ/TR
LP2950CN-L-5-0
ꢁ.ꢁV
Tape & Reel Active
Lead Free
ꢁ Pin TO-92
ꢀ%
5.0V
Bulk
Active
Lead Free
ꢁ Pin TO-92
LP2950CN-L-5-0/TR
LP295ꢀACS-L-ꢁ-ꢁ
ꢀ%
5.0V
Tape & Reel Active
Lead Free
8 Pin SOIC
0.50%
ꢁ.ꢁV
Bulk
Active
Lead Free
8 Pin SOIC
LP295ꢀACS-L-ꢁ-ꢁ/TR 0.50%
LP295ꢀACS-L-5-0 0.50%
LP295ꢀACS-L-5-0/TR 0.50%
ꢁ.ꢁV
Tape & Reel Active
Lead Free
8 Pin SOIC
5.0V/ADJ
5.0V/ADJ
ꢁ.ꢁV
Bulk
Active
Lead Free
8 Pin SOIC
Tape & Reel Active
Lead Free
8 Pin SOIC
LP295ꢀCS-L-ꢁ-ꢁ
ꢀ%
ꢀ%
ꢀ%
ꢀ%
Bulk
Active
Lead Free
8 Pin SOIC
LP295ꢀCS-L-ꢁ-ꢁ/TR
LP295ꢀCS-L-5-0
ꢁ.ꢁV
Tape & Reel Active
Lead Free
8 Pin SOIC
5.0V/ADJ
5.0V/ADJ
Bulk
Active
Lead Free
8 Pin SOIC
LP295ꢀCS-L-5-0/TR
Tape & Reel Active
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
© 2008 Exar Corporation
ꢀ5
ORDERING INFORMATION
(continued)
Output
Voltage
ꢁ.ꢁV
Accuracy
Part Number
Package Shipping Status
LP2950ACN-ꢁ-ꢁ
LP2950ACN-5-0
LP2950CN-ꢁ-ꢁ
0.50%
0.50%
ꢀ%
ꢁ Pin TO-92
ꢁ Pin TO-92
ꢁ Pin TO-92
Bulk
Bulk
Bulk
EOL
EOL
EOL
EOL
EOL
EOL
EOL
EOL
EOL
EOL
EOL
EOL
OBS
OBS
OBS
OBS
5.0V
ꢁ.ꢁV
ꢁ.ꢁV
5.0V
5.0V
ꢁ.ꢁV
LP2950CN-ꢁ-ꢁ/TR
LP2950CN-5-0
ꢀ%
ꢁ Pin TO-92 Tape & Reel
ꢁ Pin TO-92 Bulk
ꢁ Pin TO-92 Tape & Reel
ꢀ%
LP2950CN-5-0/TR
LP295ꢀACS-ꢁ-ꢁ
LP295ꢀACS-5-0
LP295ꢀCS-ꢁ-ꢁ
ꢀ%
0.50%
0.50%
ꢀ%
8 Pin SOIC
Bulk
Bulk
Bulk
5.0V/ADJ 8 Pin SOIC
ꢁ.ꢁV
ꢁ.ꢁV
8 Pin SOIC
LP295ꢀCS-ꢁ-ꢁ/TR
LP295ꢀCS-5-0
ꢀ%
8 Pin SOIC Tape & Reel
Bulk
5.0V/ADJ 8 Pin SOIC Tape & Reel
ꢀ%
5.0V/ADJ 8 Pin SOIC
LP295ꢀCS-5-0/TR
LP2950ACN-ꢁ-ꢁ/TR
LP2950ACN-5-0/TR
LP295ꢀACS-ꢁ-ꢁ/TR
LP295ꢀACS-5-0/TR
ꢀ%
0.50%
0.50%
0.50%
0.50%
ꢁ.ꢁV
5.0V
ꢁ.ꢁV
ꢁ Pin TO-92 Tape & Reel
ꢁ Pin TO-92 Tape & Reel
8 Pin SOIC Tape & Reel
5.0V/ADJ 8 Pin SOIC Tape & Reel
Exar Corporation
Headquarters and
Sales Office
48720 Kato Road
Fremont, CA 94538
main: 510-668-7000
fax: 510-668-7030
EXAR Corporation reserves the right to make changes to the products contained in this publication in order
to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any
circuits described herein, conveys no license under any patent or other right, and makes no representation
that the circuits are free of patent infringement. Charts and schedules contained here in are only for
illustration purposes and may vary depending upon a user’s specific application. While the information in this
publication has been carefully checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the
failure or malfunction of the product can reasonably be expected to cause failure of the life support system or
to significantly affect its safety or effectiveness. Products are not authorized for use in such applications
unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or
damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation
is adequately protected under the circumstances.
© 2008 Exar Corporation
Rev G
LP2950-5ꢀ Low Dropout Linear Regulators
ꢀ6
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