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 (Tcase = 25°C unless otherwise stated)
DEVICE(1) PACKAGE
LT1085MK–XX TO–3
LT1085MG–XX TO–257
LT1085MIG–XX Isolated TO–257
LT1085MSM–XX TO–220SM
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 ther mal shutdown. Safe area
protection on the die is also included, providing protection of the series pass Darlington transistor under most conditions.
The hermetically sealed TO–3 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
VIN Input – Output Voltage Differential
PDPower Dissipation
R
q
JC Ther mal Resistance Junction To Case TO–3 Control
TO3 Power
R
q
JC Ther mal Resistance Junction To Case SMD1 Control
SMD1 Power
R
q
JC Ther mal Resistance Junction To Case TO–257 Control
TO–257 Power
TJOperating Junction Temperature Range Control
Power
TSTG Storage Temperature Range
TLEAD Lead Temperature (for 10 sec.)
35V
Inter nally 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
FEATURES
Low Dropout Performance
Fixed or Adjustable Voltages
Fixed Output Voltages of 3.3V, 5V & 12V
Adjustable Output Voltage Rang e From 1.2V
Line Regulation 0.015% / V Typical.
Load Regulation 0.01% Typical.
Available in Hermetically Sealed TO–3,SMD1 and
TO–257 (isolated & non-isolated) Packages.
Military Temperature Range (–55 to +150°C)
INPUT
SAFE AREA
PROTECTION
THERMAL
OVERLOAD
CURRENT
LIMITING
AMPLIFIER
VOLTAGE
REGULATION
AMPLIFIER
OUTPUT
ADJUST
LIMIT
SENSE
V
REF
* These ratings are only applicable for power dissipations of 30 Watts over a limited range of VIN VOUT.
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
VO4Output Voltage
VREF 4Reference Voltage
REG(LINE) 4Line Regulation
REG(LOAD) 4Load Regulation
VDDropout Voltage
ICL Current Limit
IQQuiescent Current
REG(THERM) Thermal Regulation
IPIN Adjust Pin Current
D
IPIN Adjust Pin Current Change
TSTemperature Stability
IOMinimum Load Current
VNRMS Output Noise 5
RARipple Rejection Ratio 6
VIN VOUT = 6.3V IO= 10mA
IO= 10mA to 3A TJ= Over Temp 3
VIN VOUT = 8V IO= 10mA
IO= 10mA to 3A TJ= Over Temp 3
VIN VOUT = 15V IO= 10mA
IO= 10mA to 3A TJ= Over Temp 3
VIN VOUT = VO+ 3V IO= 10mA
IO= 10mA to 3A TJ= Over Temp 3
VIN VOUT = 1.5 to 15V TJ= 25°C
IO= 10mA TJ= Over Temp 3
VIN VOUT = 1.5 to 35V IO= 10mA
TJ= Over Temp 3
VIN VOUT = 3V TJ= 25°C
VIN VOUT = 3V TJ= Over Temp 3
D
VOUT ,
D
VREF = 1% TJ= Over Temp 3
VIN VOUT = 5V TJ= Over Temp 3
VIN VOUT = 25V TJ= Over Temp 3
VIN VOUT = 35V TJ= Over Temp 3
tp= 30ms TJ= 25°C
TJ= 25°C
TJ= Over Temp 3
TJ= Over Temp 3
VIN VOUT = 5V IO= 0.5A
TJ= Over Temp 3
VIN VOUT = 25V IO= 0.5A
TJ= Over Temp 3
TJ= 25°C
VIN VOUT = 3V IO= 3A
TJ= 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
510
0.003
60 75
3.3
5
12
ADJ.
Output
Parameter Voltage Test Conditions 1,2 Min. Typ. Max. Unit
ELECTRICAL CHARACTERISTICS (TJ= 25°C Unless otherwise stated)
V
V
%
%
%
V
A
mA
% / W
m
A
m
A
%
mA
%VO
dB
Notes
1. Test Conditions unless otherwise stated: VIN = 1.5 to 35V, or Maximum Input, whichever is less.
IO= 10mA to 3A.
2. These specifications are only applicable for power dissipations of 30 Watts over a limited range of VIN VOUT.
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. COUT (CADJ) = 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 (TO–257)
3.05 ± 0.08
(0.12 ± 0.003)
Ø
3.05 (0.120)
3.30 (0.130)
0.64 (0.025)
0.89 (0.035)
2.54 ± 0.08
(0.10 ± 0.003)
10.41 ( 0.41 )
10.92 ( 0.43 )
16.38 (0.645)
16.89 (0.665)
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) 13.39 ( 0.52 7)
13.64 ( 0.53 7)
123
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
3.60 (0.142)
Max.
3.70 (0.146)
3.41 (0.134)
3.70 (0.146)
3.41 (0.134)
0.89
(0.035)
min.
4.14 (0.163)
3.84 (0.151)
10.69 (0.421)
10.39 (0.409)
9.67 (0.381)
9.38 (0.369)
11.58 (0.456)
11.28 (0.444)
16.02 (0.631)
15.73 (0.619)
0.50 (0.020)
0.26 (0.010)
0.76
(0.030)
min.
13
2