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.
便携式医疗设备的特殊性决定了它们应该是对用户友好的、必须工作在无菌环境下，并且空间占用小、耗能低。 同时，便携式医疗设备还需要足够的计算能力以便处理医疗数据，能够连接到无线或有线接口以便记录和发送数据。从设计人员的角度考虑，上述需求需要低功耗的单片机（MCU）和数字信号控制器（Digital Signal Controller，DSC）。 正是有了嵌入式处理器，设计人员才有可能设...[详细]
卡巴斯基的安全研究人员称其发现了如何攻击Intel微处理器的远程攻击代码，据传，这一代码可以通过TCP/IP包和JavaScript代码到达用户系统。 目前受影响的系统包括Windows XP，Vista，Windows Server 2003，Windows Server 2008，Linux甚至是BSD和Mac。但所幸大多数错误可以由Intel和BIOS厂商联合进行修复。 卡...[详细]
模拟与混合信号
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
