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
EXAR [ EXAR CORPORATION ]
