Datasheet

LT1083/LT1084/LT1085
4
108345fg
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage I
OUT
= 10mA, T
J
= 25°C,
(V
IN
– V
OUT
) = 3V
10mA ≤ I
OUT
≤ I
FULL_LOAD
1.5V ≤ (V
IN
– V
OUT
) ≤ 25V (Notes 4, 6, 7)
l
1.238
1.225
1.250
1.250
1.262
1.270
V
V
Line Regulation I
LOAD
= 10mA, 1.5V ≤ (V
IN
– V
OUT
) ≤ 15V, T
J
= 25°C (Notes 2, 3)
l
0.015
0.035
0.2
0.2
%
%
M-Grade: 15V ≤ (V
IN
– V
OUT
) ≤ 35V (Notes 2, 3)
l
0.05 0.5 %
C-, I-Grades: 15V ≤ (V
IN
– V
OUT
) ≤ 30V (Notes 2, 3)
l
0.05 0.5 %
Load Regulation (V
IN
– V
OUT
) = 3V, 10mA ≤ I
OUT
≤ I
FULL_LOAD
, T
J
= 25°C
(Notes 2, 3, 4, 6)
l
0.1
0.2
0.3
0.4
%
%
Dropout Voltage ΔV
REF
= 1%, I
OUT
= I
FULL_LOAD
(Notes 5, 6, 8)
l
1.3 1.5 V
Current Limit
LT1083
LT1084
LT1085
(V
IN
– V
OUT
) = 5V
(V
IN
– V
OUT
) = 25V
(V
IN
– V
OUT
) = 5V
(V
IN
– V
OUT
) = 25V
(V
IN
– V
OUT
) = 5V
(V
IN
– V
OUT
) = 25V
l
l
l
l
l
l
8.0
0.4
5.5
0.3
3.2
0.2
9.5
1.0
6.5
0.6
4.0
0.5
A
A
A
A
A
A
Minimum Load Current (V
IN
– V
OUT
) = 25V
l
510 mA
Thermal Regulation
LT1083
LT1084
LT1085
T
A
= 25°C, 30ms Pulse
0.002
0.003
0.004
0.010
0.015
0.020
%/W
%/W
%/W
Ripple Rejection f = 120Hz, C
ADJ
= 25μF, C
OUT
= 25μF Tantalum
I
OUT
= I
FULL_LOAD
, (V
IN
– V
OUT
) = 3V (Notes 6, 7, 8)
l
60 75 dB
Adjust Pin Current T
J
= 25°C
l
55
120
μA
μA
Adjust Pin Current Change 10mA ≤ I
OUT
≤ I
FULL_LOAD
, 1.5V ≤ (V
IN
– V
OUT
) ≤ 25V (Note 6)
l
0.2 5 μA
Temperature Stability
l
0.5 %
Long-Term Stability T
A
= 125°C, 1000 Hrs 0.3 1 %
RMS Output Noise (% of V
OUT
)T
A
= 25°C, 10Hz = ≤ f ≤ 10kHz 0.003 %
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