If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Maximum Input to Output Voltage Differential
LM1085-ADJ
LM1085-12
LM1085-3.3
LM1085-5.0
Power Dissipation (Note 2)
29V
18V
27V
25V
Internally Limited
Junction Temperature (T
J
)(Note 3)
Storage Temperature Range
Lead Temperature
ESD Tolerance (Note 4)
150˚C
-65˚C to 150˚C
260˚C, to 10 sec
2000V
Operating Ratings
(Note 1)
Junction Temperature Range (T
J
) (Note 3)
Control Section
Output Section
−40˚C to 125˚C
−40˚C to 150˚C
Electrical Characteristics
Typicals and limits appearing in normal type apply for T
J
= 25˚C. Limits appearing in
Boldface
type apply over the entire junc-
tion temperature range for operation.
Symbol
V
REF
Parameter
Reference Voltage
Conditions
LM1085-ADJ
I
OUT
= 10mA, V
IN
−V
OUT
= 3V
10mA
≤I
OUT
≤
I
FULL LOAD
,1.5V
≤
(V
IN
−V
OUT
)
≤
15V
(Note 7)
LM1085-3.3
I
OUT
= 0mA, V
IN
= 5V
0
≤
I
OUT
≤I
FULL LOAD
, 4.8V≤ V
IN
≤15V
LM1085-5.0
I
OUT
= 0mA, V
IN
= 8V
0
≤
I
OUT
≤
I
FULL LOAD
, 6.5V
≤
V
IN
≤
20V
LM1085-12
I
OUT
= 0mA, V
IN
= 15V
0
≤
I
OUT
≤
I
FULL LOAD
, 13.5V
≤
V
IN
≤
25V
∆V
OUT
Line Regulation
(Note 8)
LM1085-ADJ
I
OUT
=10mA, 1.5V≤ (V
IN
-V
OUT
)
≤
15V
LM1085-3.3
I
OUT
= 0mA, 4.8V
≤
V
IN
≤
15V
LM1085-5.0
I
OUT
= 0mA, 6.5V
≤
V
IN
≤
20V
LM1085-12
I
OUT
=0mA, 13.5V
≤
V
IN
≤
25V
∆V
OUT
Load Regulation
(Note 8)
LM1085-ADJ
(V
IN
-V
OUT
) = 3V, 10mA
≤
I
OUT
≤
I
FULL
LM1085-3.3
V
IN
= 5V, 0
≤
I
OUT
≤
I
FULL
LM1085-5.0
V
IN
= 8V, 0
≤
I
OUT
≤
I
FULL
LOAD
LOAD
Min
(Note 6)
1.238
1.225
Typ
(Note 5)
1.250
1.250
Max
(Note 6)
1.262
1.270
Units
V
V
V
OUT
Output Voltage
(Note 7)
3.270
3.235
4.950
4.900
11.880
11.760
3.300
3.300
5.000
5.000
12.000
12.000
0.015
0.035
0.5
1.0
0.5
1.0
1.0
2.0
0.1
0.2
3
7
5
10
12
24
1.3
3.330
3.365
5.050
5.100
12.120
12.240
0.2
0.2
6
6
10
10
25
25
0.3
0.4
15
20
20
35
36
72
1.5
V
V
V
V
V
V
%
%
mV
mV
mV
mV
mV
mV
%
%
mV
mV
mV
mV
mV
mV
V
LOAD
LM1085-12
V
IN
= 15V, 0
≤
I
OUT
≤
I
FULL
Dropout Voltage
(Note 9)
LOAD
LM1085-ADJ, 3.3, 5, 12
∆V
REF
,
∆V
OUT
= 1%, I
OUT
= 3A
3
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LM1085
Electrical Characteristics
(Continued)
Typicals and limits appearing in normal type apply for T
J
= 25˚C. Limits appearing in
Boldface
type apply over the entire junc-
tion temperature range for operation.
Parameter
Current Limit
LM1085-ADJ
V
IN
−V
OUT
= 5V
V
IN
−V
OUT
= 25V
LM1085-3.3
V
IN
= 8V
LM1085-5.0
V
IN
= 10V
LM1085-12
V
IN
= 17V
Minimum Load
Current (Note 10)
Quiescent Current
LM1085-ADJ
V
IN
−V
OUT
= 25V
LM1085-3.3
V
IN
≤
18V
LM1085-5.0
V
IN
≤
20V
LM1085-12
V
IN
≤
25V
Thermal Regulation
Ripple Rejection
T
A
= 25˚C, 30ms Pulse
f
RIPPLE
= 120Hz, C
OUT
= 25µF Tantalum, I
OUT
= 3A
LM1085-ADJ, C
ADJ
= 25µF, (V
IN
−V
O
) = 3V
LM1085-3.3, V
IN
= 6.3V
LM1085-5.0, V
IN
= 8V
LM1085-12 V
IN
= 15V
Adjust Pin Current
Adjust Pin Current
Change
Temperature
Stability
Long Term Stability
RMS Output Noise
(% of V
OUT
)
Thermal Resistance
Junction-to-Case
T
A
=125˚C, 1000Hrs
10Hz
≤
f≤ 10kHz
3-Lead TO-263: Control Section/Output Section
3-Lead TO-220: Control Section/Output Section
LM1085
10mA
≤
I
OUT
≤
I
FULL
LOAD
,
Symbol
I
LIMIT
Conditions
Min
(Note 6)
3.2
0.2
3.2
3.2
3.2
Typ
(Note 5)
5.5
0.5
5.5
5.5
5.5
5.0
5.0
5.0
5.0
.004
Max
(Note 6)
Units
A
A
A
A
A
10.0
10.0
10.0
10.0
0.02
mA
mA
mA
mA
%/W
dB
dB
dB
dB
120
5
µA
µA
%
1.0
%
%
0.7/3.0
0.7/3.0
˚C/W
˚C/W
60
60
60
54
75
72
68
60
55
1.5V
≤
V
IN
−V
OUT
≤
25V
0.2
0.5
0.3
0.003
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 2:
Power dissipation is kept in a safe range by current limiting circuitry. Refer to Overload Recovery in Application Notes.
Note 3:
The maximum power dissipation is a function of T
J(max)
,
θ
JA
, and T
A
. The maximum allowable power dissipation at any ambient temperature is
P
D
= (T
J(max)
–T
A
)/θ
JA
. All numbers apply for packages soldered directly into a PC board. Refer to Thermal Considerations in the Application Notes.
Note 4:
For testing purposes, ESD was applied using human body model, 1.5kΩ in series with 100pF.
Note 5:
Typical Values represent the most likely parametric norm.
Note 6:
All limits are guaranteed by testing or statistical analysis.
Note 7:
I
FULL LOAD
is defined in the current limit curves. The I
FULL LOAD
Curve defines the current limit as a function of input-to-output voltage. Note that 30W power
dissipation for the LM1085 is only achievable over a limited range of input-to-output voltage.
Note 8:
Load and line regulation are measured at constant junction temperature, and are guaranteed up to the maximum power dissipation of 30W. Power
dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output
range.
Note 9:
Dropout voltage is specified over the full output current range of the device.
Note 10:
The minimum output current required to maintain regulation.
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