Semelab plc.
Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail:
sales@semelab.co.uk
Website:
http://www.semelab.co.uk
Prelim. 4/95
LT1085M
MILITARY VERSION
ABSOLUTE MAXIMUM RATINGS
(T
case
= 25C unless otherwise stated)
DEVICE
(1)
PACKAGE
LT1085MKXX
TO3
LT1085MGXX
TO257
LT1085MIGXX
Isolated TO257
LT1085MSMXX
TO220SM
DESCRIPTION
The LT1085 voltage regulators are monolithic
integrated circuits designed for use in applications
requiring a well regulated positive output voltage
with low input-output differential voltage.
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 TO3 packages are utilised for high reliablitiy and low thermal resistance, whilst the SMD1
package is designed for surface mount applications.
Note
1) XX = Voltage Option: 3.3, 5 or 12
XX = Left blank for Adjustable Option.
3 AMP POSITIVE
VOLTAGE REGULATOR
V
IN
Input Output Voltage Differential
P
D
Power Dissipation
R
q
JC
Thermal Resistance Junction To Case
TO3
Control
TO3
Power
R
q
JC
Thermal Resistance Junction To Case
SMD1
Control
SMD1
Power
R
q
JC
Thermal Resistance Junction To Case
TO257
Control
TO257
Power
T
J
Operating Junction Temperature Range
Control
Power
T
STG
Storage Temperature Range
T
LEAD
Lead Temperature (for 10 sec.)
35V
Internally limited *
0.93C / W
3.0C / W
0.79C / W
4.0C / W
0.79C / W
4.0C / W
55 to 150C
55 to 200C
65 to 150C
300C
FEATURES
Low Dropout Performance
Fixed or Adjustable Voltages
Fixed Output Voltages of 3.3V, 5V & 12V
Adjustable Output Voltage Range From 1.2V
Line Regulation 0.015% / V Typical.
Load Regulation 0.01% Typical.
Available in Hermetically Sealed TO3,SMD1 and
TO257 (isolated & non-isolated) Packages.
Military Temperature Range (55 to +150C)
INPUT
SAFE AREA
PROTECT ION
T H E R M AL
O V ER L O AD
CU RR EN T
LIMITING
AMPLIFIER
VOL T AGE
REGUL ATION
AMPLIFIER
OU TPUT
ADJUST
L IM I T
SEN SE
V
R E F
* These ratings are only applicable for power dissipations of 30 Watts over a limited range of V
IN
V
OUT
.
Semelab plc.
Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail:
sales@semelab.co.uk
Website:
http://www.semelab.co.uk
Prelim. 4/95
LT1085M
MILITARY VERSION
V
O
4
Output Voltage
V
REF
4
Reference Voltage
REG
(LINE)
4
Line Regulation
REG
(LOAD)
4
Load Regulation
V
D
Dropout Voltage
I
CL
Current Limit
I
Q
Quiescent Current
REG
(THERM)
Thermal Regulation
I
PIN
Adjust Pin Current
D
I
PIN
Adjust Pin Current Change
T
S
Temperature Stability
I
O
Minimum Load Current
V
N
RMS Output Noise
5
R
A
Ripple Rejection Ratio
6
V
IN
V
OUT
= 6.3V
I
O
= 10mA
I
O
= 10mA to 3A
T
J
= Over Temp
3
V
IN
V
OUT
= 8V
I
O
= 10mA
I
O
= 10mA to 3A
T
J
= Over Temp
3
V
IN
V
OUT
= 15V
I
O
= 10mA
I
O
= 10mA to 3A
T
J
= Over Temp
3
V
IN
V
OUT
= V
O
+ 3V
I
O
= 10mA
I
O
= 10mA to 3A
T
J
= Over Temp
3
V
IN
V
OUT
= 1.5 to 15V
T
J
= 25C
I
O
= 10mA
T
J
= Over Temp
3
V
IN
V
OUT
= 1.5 to 35V
I
O
= 10mA
T
J
= Over Temp
3
V
IN
V
OUT
= 3V
T
J
= 25C
V
IN
V
OUT
= 3V
T
J
= Over Temp
3
D
V
OUT
,
D
V
REF
= 1%
T
J
= Over Temp
3
V
IN
V
OUT
= 5V
T
J
= Over Temp
3
V
IN
V
OUT
= 25V
T
J
= Over Temp
3
V
IN
V
OUT
= 35V
T
J
= Over Temp
3
t
p
= 30ms
T
J
= 25C
T
J
= 25C
T
J
= Over Temp
3
T
J
= Over Temp
3
V
IN
V
OUT
= 5V
I
O
= 0.5A
T
J
= Over Temp
3
V
IN
V
OUT
= 25V
I
O
= 0.5A
T
J
= Over Temp
3
T
J
= 25C
V
IN
V
OUT
= 3V
I
O
= 3A
T
J
= Over Temp
3
3.267
3.3
3.333
3.234
3.3
3.366
4.95
5
5.05
4.90
5
5.10
11.88
12
12.12
11.76
12
12.24
1.238
1.25
1.262
1.225
1.25
1.270
0.015
0.2
0.035
0.05
0.6
0.1
0.3
0.2
0.4
1.3
1.5
3.2
4.0
0.2
0.5
10
0.002
0.01
55
120
0.2
5
0.5
5
10
0.003
60
75
3.3
5
12
ADJ.
Output
Parameter
Voltage Test Conditions
1,2
Min.
Typ.
Max.
Unit
ELECTRICAL CHARACTERISTICS
(T
J
= 25C Unless otherwise stated)
V
V
%
%
%
V
A
mA
% / W
m
A
m
A
%
mA
%V
O
dB
Notes
1.
Test Conditions unless otherwise stated:
V
IN
= 1.5 to 35V, or Maximum Input, whichever is less.
I
O
= 10mA to 3A.
2.
These specifications are only applicable for power dissipations of 30 Watts over a limited range of V
IN
V
OUT
.
3.
Over Temp. = Over specified Junction Temperature Range (See Absolute Maximum Ratings).
4.
Low duty cycle pulse test with Kelvin connections required. Changes in output voltage are covered under the specification
for thermal regulation.
5.
Bandwidth of 10Hz to 10kHz.
6.
120Hz input ripple, 15V = 64dB min. C
OUT
(C
ADJ
) = 25
m
F.
Semelab plc.
Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail:
sales@semelab.co.uk
Website:
http://www.semelab.co.uk
Prelim. 4/95
LT1085M
MILITARY VERSION
G & IG Packages (TO257)
3.05 0.08
(0.12 0.003)
3.05 (0.120)
3.30 (0.130)
0.64 (0.025)
0.89 (0.035)
2.54 0.08
(0.10 0.003)
1
0
.4
1
(
0
.4
1
)
1
0
.9
2
(
0
.4
3
)
1
6
.3
8
(
0
.6
4
5
)
1
6
.8
9
(
0
.6
6
5
)
0.89 (0.035)
1.14 (0.045)
10.41 (0.410)
10.72 (0.422)
4.83 (0.190)
5.46 (0.215)
12.
70 (
0
.
50)
19.
05 (
0
.
75)
1
3
.3
9
(
0
.5
2
7
)
1
3
.6
4
(
0
.5
3
7
)
1 2 3
K Package (TO3)
SMD1 PACKAGE
LT1085MK
Pin
Fixed
Adjustable
1
COMMON
ADJUST
2
OUTPUT
OUTPUT
3
INPUT
INPUT
Case is OUTPUT
Pin
Fixed
Adjustable
1
COMMON
ADJUST
2
INPUT
INPUT
Case is OUTPUT
LT1085MSMD
Pin
Fixed
Adjustable
1
COMMON
ADJUST
2
OUTPUT
OUTPUT
3
INPUT
INPUT
LT1085MG
Pin
Fixed
Adjustable
1
COMMON
ADJUST
2
OUTPUT
OUTPUT
3
INPUT
INPUT
Case is ISOLATED
LT1085MIG
40.01 (1.575)
Max.
4.47 (0.176)
Rad.
2 Pls.
22.23 (0.875)
Max.
11.43 (0.450)
6.35 (0.250)
12.19 (0.48)
11.18 (0.44)
1.63 (0.064)
1.52 (0.060)
1.09 (0.043)
0.97 (0.038)
Dia.
30.40 (1.197)
29.90 (1.177)
16.97 (0.668)
16.87 (0.664)
4.09 (0.161)
3.84 (0.151)
2 Pls
11.18 (0.440)
10.67 (0.420)
26.67
(1.050)
Max.
2
1
3 . 6 0 ( 0 . 1 4 2 )
M a x .
3 . 7 0 ( 0 . 1 4 6 )
3 . 4 1 ( 0 . 1 3 4 )
3 . 7 0 ( 0 . 1 4 6 )
3 . 4 1 ( 0 . 1 3 4 )
0 . 8 9
( 0 . 0 3 5 )
m i n .
4.
14
(
0.
163)
3.
84
(
0.
151)
10.
69
(
0
.
4
21)
10.
39
(
0
.
4
09)
9 . 6 7 ( 0 . 3 8 1 )
9 . 3 8 ( 0 . 3 6 9 )
1 1 . 5 8 ( 0 . 4 5 6 )
1 1 . 2 8 ( 0 . 4 4 4 )
16.
02
(
0
.
6
31)
15.
73
(
0
.
6
19)
0 . 5 0 ( 0 . 0 2 0 )
0 . 2 6 ( 0 . 0 1 0 )
0.
76
(
0
.
030) mi
n
.
1
3
2
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