The LT1085 voltage regulators are monolithic inte-
grated circuits designed for use in applications
requiring a well regulated positive output voltage
with low input-output differential voltage.
Note
1) –XX = Voltage Option: 3.3, 5 or 12
–XX = Left blank for Adjustable Option.
Features include full power usage of up to 3A load current, internal current limiting and thermal shutdown. Safe area
protection on the die is also included, providing protection of the series pass Darlington transistor under most conditions.
The hermetically sealed packages are utilised for high reliability and low thermal resistance, whilst the SMD1 package
is also designed for surface mount applications.
ABSOLUTE MAXIMUM RATINGS
(T
case
= 25°C unless otherwise stated)
V
IN
P
D
R
θJC
R
θJC
R
θJC
T
J
T
STG
T
LEAD
Input – Output Voltage Differential
Power Dissipation
Thermal Resistance Junction To Case
Thermal Resistance Junction To Case
Thermal Resistance Junction To Case
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (for 10 sec.)
TO–3
TO–3
SMD1
SMD1
TO–257
TO–257
Control
Power
Control
Power
Control
Power
Control
Power
35V
Internally limited *
0.93°C / W
3.0°C / W
0.79°C / W
4.0°C / W
0.79°C / W
4.0°C / W
–55 to 150°C
–55 to 200°C
–65 to 150°C
300°C
* These ratings are only applicable for power dissipations of 28 Watts over a limited range of V
IN
– V
OUT
.
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is
believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in
its use. Semelab encourages customers to verify that datasheets are current before placing orders.
denotes specification is applicable over full operating temperature range.
Min. Typ. Max. Unit
3.270 3.300 3.333
V
♦
3.235 3.300 3.365
4.950 5.000 5.050
♦
4.900 5.000 5.100
11.88 12.00 12.12
♦
11.76 12.00 12.24
1.238 1.250 1.262
V
V
V
mV
mV
mV
Parameter
Output
Voltage Test Conditions
V
IN
= 5V, I
OUT
= 0, T
J
= 25°C (K Pack)
3.3V
4.8V
≤
V
IN
≤
15V, 0
≤
I
OUT
≤
I
MAXLOAD
5.0V
12V
V
IN
= 8V, I
OUT
= 0, T
J
= 25°C (K Pack)
6.5V
≤
V
IN
≤
20V, 0
≤
I
OUT
≤
I
MAXLOAD
V
IN
= 15V, I
OUT
= 0, T
J
= 25°C (K Pack)
13.5V
≤
V
IN
≤
25V, 0
≤
I
OUT
≤
I
MAXLOAD
(V
IN
- V
OUT
)= 3V, I
OUT
= 10mA, T
J
= 25°C
V
O
Output Voltage
3,4,6
V
REF
Reference Voltage
4
ADJ.
3.3V
5.0V
1.5V
≤
(V
IN
-
V
OUT
)
≤
25V, 10mA
≤
I
OUT
≤
I
MAXLOAD
♦
1.225 1.250 1.270
4.8V
≤
V
IN
≤
15V, I
OUT
= 0, T
J
= 25°C
0.5
6
4.8V
≤
V
IN
≤
15V, I
OUT
= 0
♦
1.0
6
6.5V
≤
V
IN
≤
20V, I
OUT
= 0, T
J
= 25°C
0.5
10
6.5V
≤
V
IN
≤
20V, I
OUT
= 0
13.5V
≤
V
IN
≤
25V, I
OUT
= 0, T
J
= 25°C
13.5V
≤
V
IN
≤
25V, I
OUT
= 0
1.5V
≤
(V
IN
-
V
OUT
)
≤
15V, I
LOAD
= 10mA, T
J
= 25°C
♦
♦
♦
♦
♦
♦
T
J
= 25°C
(V
IN
- V
OUT
) = 3V, 10mA
≤
I
OUT
≤
I
MAXLOAD
♦
♦
♦
♦
♦
ΔV
OUT
= 33mV,I
OUT
= I
MAXLOAD
ΔV
OUT
= 50mV,I
OUT
= I
MAXLOAD
ΔV
OUT
= 120mV,I
OUT
= I
MAXLOAD
ΔV
OUT
= 1%V ,I
OUT
= I
MAXLOAD
♦
1.0
1.0
2.0
0.015
0.035
0.050
3
7
5
10
12
24
0.1
0.2
1.3
1.3
1.3
1.3
10
25
25
0.2
0.2
0.5
15
20
20
35
36
72
0.3
0.4
1.5
1.5
1.5
1.5
REG
(LINE)
Line Regulation
2,3
12V
ADJ. 1.5V
≤
(V
IN
-
V
OUT
)
≤
15V, I
LOAD
= 10mA
15V
≤
(V
IN
-
V
OUT
)
≤
35V
3.3V
5.0V
REG
(LOAD)
Load Regulation
2,3,4
12V
V
IN
= 5V, 0
≤
I
OUT
≤
3A, T
J
= 25°C
V
IN
= 5V, 0
≤
I
OUT
≤
3A
V
IN
= 8V, 0
≤
I
OUT
≤
I
MAXLOAD,
T
J
= 25°C
V
IN
= 8V, 0
≤
I
OUT
≤
I
MAXLOAD
V
IN
= 15V, 0
≤
I
OUT
≤
I
MAXLOAD,
T
J
= 25°C
V
IN
= 15V, 0
≤
I
OUT
≤
I
MAXLOAD
(V
IN
- V
OUT
) = 3V,10mA
≤
I
OUT
≤
I
MAXLOAD
,
ADJ.
3.3V
V
D
Dropout Voltage
5
%
mV
mV
mV
%
5.0V
12V
ADJ
V
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is
believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in
its use. Semelab encourages customers to verify that datasheets are current before placing orders.
denotes specification is applicable over full operating temperature range.
Min. Typ. Max. Unit
3.270 3.300 3.333
V
♦
3.235 3.300 3.365
4.950 5.000 5.050
♦
4.900 5.000 5.100
11.88 12.00 12.12
♦
11.76 12.00 12.24
1.231 1.250 1.268
V
V
V
mV
mV
mV
Parameter
Output
Voltage Test Conditions
V
IN
= 5V, I
OUT
= 0, T
J
= 25°C (K Pack)
3.3V
4.8V
≤
V
IN
≤
15V, 0
≤
I
OUT
≤
I
MAXLOAD
5.0V
12V
V
IN
= 8V, I
OUT
= 0, T
J
= 25°C (K Pack)
6.5V
≤
V
IN
≤
20V, 0
≤
I
OUT
≤
I
MAXLOAD
V
IN
= 15V, I
OUT
= 0, T
J
= 25°C (K Pack)
13.5V
≤
V
IN
≤
25V, 0
≤
I
OUT
≤
I
MAXLOAD
(V
IN
- V
OUT
)= 3V, I
OUT
= 10mA, T
J
= 25°C
V
O
Output Voltage
3,4,6
V
REF
Reference Voltage
4
ADJ.
3.3V
5.0V
1.5V
≤
(V
IN
-
V
OUT
)
≤
25V, 10mA
≤
I
OUT
≤
I
MAXLOAD
♦
1.219 1.250 1.281
4.8V
≤
V
IN
≤
15V, I
OUT
= 0, T
J
= 25°C
0.5
6
4.8V
≤
V
IN
≤
15V, I
OUT
= 0
♦
1.0
6
6.5V
≤
V
IN
≤
20V, I
OUT
= 0, T
J
= 25°C
0.5
10
6.5V
≤
V
IN
≤
20V, I
OUT
= 0
13.5V
≤
V
IN
≤
25V, I
OUT
= 0, T
J
= 25°C
13.5V
≤
V
IN
≤
25V, I
OUT
= 0
1.5V
≤
(V
IN
-
V
OUT
)
≤
15V, I
LOAD
= 10mA, T
J
= 25°C
♦
♦
♦
♦
♦
♦
T
J
= 25°C
(V
IN
- V
OUT
) = 3V, 10mA
≤
I
OUT
≤
I
MAXLOAD
♦
♦
♦
♦
♦
ΔV
OUT
= 33mV,I
OUT
= I
MAXLOAD
ΔV
OUT
= 50mV,I
OUT
= I
MAXLOAD
ΔV
OUT
= 120mV,I
OUT
= I
MAXLOAD
ΔV
OUT
= 1%V ,I
OUT
= I
MAXLOAD
♦
1.0
1.0
2.0
0.015
0.035
0.050
3
7
5
10
12
24
0.7
0.8
1.3
1.3
1.3
1.3
10
25
25
0.2
0.2
0.5
15
20
20
35
36
72
1.25
1.65
1.5
1.5
1.5
1.5
REG
(LINE)
Line Regulation
2,3
12V
ADJ. 1.5V
≤
(V
IN
-
V
OUT
)
≤
15V, I
LOAD
= 10mA
15V
≤
(V
IN
-
V
OUT
)
≤
35V
3.3V
5.0V
REG
(LOAD)
Load Regulation
2,3,4
12V
V
IN
= 5V, 0
≤
I
OUT
≤
3A, T
J
= 25°C
V
IN
= 5V, 0
≤
I
OUT
≤
3A
V
IN
= 8V, 0
≤
I
OUT
≤
I
MAXLOAD,
T
J
= 25°C
V
IN
= 8V, 0
≤
I
OUT
≤
I
MAXLOAD
V
IN
= 15V, 0
≤
I
OUT
≤
I
MAXLOAD,
T
J
= 25°C
V
IN
= 15V, 0
≤
I
OUT
≤
I
MAXLOAD
(V
IN
- V
OUT
) = 3V,10mA
≤
I
OUT
≤
I
MAXLOAD
,
ADJ.
3.3V
V
D
Dropout Voltage
5
5.0V
12V
ADJ
%
mV
mV
mV
%
V
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is
believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in
its use. Semelab encourages customers to verify that datasheets are current before placing orders.
denotes specification is applicable over full operating temperature range.
Parameter
Output
Voltage Test Conditions
3.3V V
IN
= 8V
5.0V
V
IN
= 10V
V
IN
= 17V
(V
IN
-V
OUT
) = 5V
(V
IN
-V
OUT
) = 25V
V
IN
= 18V
V
IN
≤
20V
V
IN
≤
25V
Over Full Operating Temperature Range
ADJ.
ALL
3.3V
5.0V
1.5V
≤
(V
IN
-
V
OUT
)
≤
25V, 10mA
≤
I
OUT
≤
I
MAXLOAD
T
A
= 25°C, 30ms Pulse
V
IN
= 6.3V, f = 120Hz, C
OUT
=25μF, I
OUT
= 3A
V
IN
= 8V, f = 120Hz, C
OUT
=25μF, I
OUT
= 3A
V
IN
= 15V, f = 120Hz, C
OUT
=25μF, I
OUT
= 3A
(V
IN
-V
OUT
) = 3V, f = 120Hz, C
OUT
=25μF,
C
ADJ
=25μF, I
OUT
= IMAXLOAD ,
Over Full Operating Temperature Range
T
A
= 125°C, 1000 Hours
T
A
= 25°C, 10Hz
≤
f
≤
10kHz
12V
ADJ.
3.3V
Min.
♦
3.2
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
3.2
3.2
3.2
0.2
Typ.
4.0
4.0
4.0
4.0
0.5
5.0
5.0
5.0
5.0
Max.
Unit
I
L
Current Limit
A
10.0
10.0
10.0
10.0
120
μA
mA
I
Q
Quiescient/MinLoad
Current
Adjust Pin Current
Adjust Pin Current
Change
5.0V
12V
ADJ. (V
IN
-V
OUT
) = 25V
I
PIN
ΔI
PIN
0.2
5.0
Thermal Regulation
0.004 0.020 %/W
♦
♦
♦
♦
♦
60
60
54
60
72
68
60
75
0.5
0.3
0.003
1.0
%
%
%
dB
Ripple Rejection
4
12V
ADJ.
Temperature Stability
Long Term Stability
RMS Output Noise
(% of V
OUT
)
ALL
ALL
ALL
Note 1
: Absolute Maximum Rating area those values beyond which the
life of a device may be impaired.
Note 2
: See thermal regulation specifications for changes in output volt-
age due to heating effects. Load and line regulation are measured at a
constant junction temperature by low duty cycle pulse testing.
Note 3
: Line and load regulation 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 4
: I
MAXLOAD
curve is defined as the minimum value of current limit
as a function of input to output voltage. Note that the 30W power dissipa-
tion for the LT1085 series is only achievable over a limited range of input
to output.voltage.
Note 5
: Dropout voltage is specified over the full output current range of
the device.
Note 6
: Full load current is not available at all input-output voltages. See
Notes 3, 4,
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is
believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in
its use. Semelab encourages customers to verify that datasheets are current before placing orders.
Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is
believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in
its use. Semelab encourages customers to verify that datasheets are current before placing orders.
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