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Electrical Characteristics
Typicals and limits appearing in normal type apply for T
tion temperature range for operation.
Symbol
Parameter
I
Current Limit
LIMIT
Minimum Load
Current (Note 10)
Quiescent Current
Thermal Regulation
Ripple Rejection
Adjust Pin Current
Adjust Pin Current
Change
Temperature
Stability
Long Term Stability
RMS Output Noise
(% of V
)
OUT
Thermal Resistance
Junction-to-Case
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
P
= (T
–T
)/θ
. All numbers apply for packages soldered directly into a PC board. Refer to Thermal Considerations in the Application Notes.
D
J(max)
A
JA
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
is defined in the current limit curves. The I
FULL LOAD
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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(Continued)
= 25˚C. Limits appearing in Boldface type apply over the entire junc-
J
Conditions
LM1085-ADJ
V
−V
= 5V
IN
OUT
V
−V
= 25V
IN
OUT
LM1085-3.3
V
= 8V
IN
LM1085-5.0
V
= 10V
IN
LM1085-12
V
= 17V
IN
LM1085-ADJ
V
−V
= 25V
IN
OUT
LM1085-3.3
≤ 18V
V
IN
LM1085-5.0
≤ 20V
V
IN
LM1085-12
≤ 25V
V
IN
T
= 25˚C, 30ms Pulse
A
f
= 120Hz, C
= 25µF Tantalum, I
RIPPLE
OUT
LM1085-ADJ, C
= 25µF, (V
ADJ
LM1085-3.3, V
= 6.3V
IN
LM1085-5.0, V
= 8V
IN
LM1085-12 V
= 15V
IN
LM1085
10mA ≤ I
≤ I
, 1.5V ≤ V
OUT
FULL LOAD
T
=125˚C, 1000Hrs
A
10Hz ≤ f≤ 10kHz
3-Lead TO-263: Control Section/Output Section
3-Lead TO-220: Control Section/Output Section
, θ
, and T
J(max)
JA
Curve defines the current limit as a function of input-to-output voltage. Note that 30W power
FULL LOAD
Min
(Note 6)
3.2
0.2
3.2
3.2
3.2
= 3A
OUT
−V
) = 3V
60
IN
O
60
60
54
≤ 25V
−V
IN
OUT
. The maximum allowable power dissipation at any ambient temperature is
A
4
Typ
Max
Units
(Note 5)
(Note 6)
5.5
A
0.5
A
5.5
A
5.5
A
5.5
A
5.0
10.0
mA
5.0
10.0
mA
5.0
10.0
mA
5.0
10.0
mA
.004
0.02
%/W
75
dB
72
dB
68
dB
60
dB
55
120
µA
0.2
5
µA
0.5
%
0.3
1.0
%
0.003
%
0.7/3.0
˚C/W
0.7/3.0
˚C/W
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