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.
1. Can the transistor be set to Ib=Ic? 2. Can the collector current of the transistor be set arbitrarily? According to Ic=hfe×Ib, can the collector current be set lower than the above Ic, even if the ...
I am new to circuits. I need to connect a high-frequency amplifier circuit to my FPGA. I would like to ask for recommendations from experts. Or if anyone can make one, that would be fine. The basic re...
Basic way of data packet transmissionBy fxw4511. Introduction cc2500 supports internal hardware data packet processing mechanism, which makes it easier to use wireless protocol programs to transmit da...
[i=s]This post was last edited by kou_1053858502 on 2020-10-19 20:52[/i]AHD/TVI/CVI/CVBS to HDMI/VGA/CVBS Solution Introduction
Solution name: AHD/TVI/CVI/CVBS to HDMI/VGA/CVBS high-definition convers...
"Have you set your calendar reminder?"
On August 24, Nvidia Robotics' official account posted a photo of a black gift box on a social media platform, with an attached greeting card sig...[Details]
When we travel in cities, we all find that electric vehicles have many advantages. As a means of transportation, they can also fulfill their mission well. Now, more and more residential communities...[Details]
Ever since the Tesla fire incident, electric cars, already known for their poor reputation, have been subjected to even more scathing criticism. Despite this, many people are still willing to buy t...[Details]
On August 21, WeRide officially launched WePilot AiDrive, a one-stage end-to-end assisted driving solution developed in cooperation with Bosch. This comes only half a year after the two parties' "t...[Details]
On August 20th, Tiantai Robotics Co., Ltd., along with strategic partners including Shandong Future Robotics Technology Co., Ltd., Shandong Future Data Technology Co., Ltd., and Gangzai Robotics Gr...[Details]
In June 2014, the Ministry of Industry and Information Technology issued 4G FD-LTE licenses to China Unicom and China Telecom. Together with the 4G TD-LTE licenses issued to China Mobile, China Uni...[Details]
One of the most core components of electric vehicles is the motor. The power supply provides electrical energy to the motor, which converts this electrical energy into mechanical energy, which in t...[Details]
"We have successfully launched the first version of our dedicated chip for EMB brake-by-wire. Second-generation samples have also been successfully completed, and we are actively planning a third-g...[Details]
China, August 21, 2025 – STMicroelectronics (NYSE: STM), a world-leading semiconductor company serving a wide range of electronics applications, has published its IFRS 2025 semi-annual financial re...[Details]
A tubular motor is an electric motor that is typically used to control the movement of machines and equipment. Tubular motors are generally divided into two categories: linear tubular motors and ro...[Details]
A scale, a large, ground-mounted scale, is typically used to measure the tonnage of truck cargo. It's the primary weighing device used in factories, mines, and businesses for bulk cargo measurement...[Details]
Charging is an essential topic for electric vehicles. Batteries are a core component of new energy vehicles. So, what's the optimal charge level for electric vehicles? Based on current battery tech...[Details]
The composition of the water heater
The water heater itself is divided into the following parts:
1. Water tank.
This is where the water heater is filled with water and where the wate...[Details]
Analog Devices held a third-quarter fiscal 2025 earnings conference call. Vincent T. Roche, CEO and Chairman of the Board, and Richard C. Puccio, Executive Vice President and Chief Financial Office...[Details]
introduction
The rapid adoption of computers has led to a growing number of tasks being performed on them. People from all walks of life, especially programmers and writers, are spending incre...[Details]
Analog electronics
京公网安备 11010802033920号
EEWORLD
