LT1085GMD
LT1085IGDII
LT1085SMD
3 AMP POSITIVE
VOLTAGE REGULATOR
INPUT
SAFE AREA
PROTECT ION
CU RR EN T
LIMITING
AMPLIFIER
L IM I T
OU TPUT
SEN SE
T H E R M AL
O V ER L O AD
FEATURES
鈥?Low Dropout Performance
鈥?Fixed or Adjustable Voltages
鈥?Fixed Output Voltages of 3.3V, 5V & 12V
鈥?Adjustable Output Voltage Range From 1.2V
鈥?Line Regulation 0.015% / V Typical.
鈥?Load Regulation 0.01% Typical.
鈥?Available in Hermetically Sealed TO鈥?, SMD1 and
TO鈥?57 (isolated & non-isolated) Packages.
鈥?Military Temperature Range (鈥?5 to +150擄C)
DEVICE
(1)
LT1085K鈥揦X
LT1085G鈥揦X
LT1085IG鈥揦X
LT1085SMD鈥揦X
PACKAGE
TO鈥?
TO鈥?57
Isolated TO鈥?57
SMD1
VOL T AGE
REGUL ATION
AMPLIFIER
V
R E F
ADJUST
DESCRIPTION
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) 鈥揦X = Voltage Option: 3.3, 5 or 12
鈥揦X = 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 TO鈥? packages are utilised for high reliablitiy and low thermal resistance, whilst the SMD1
package is designed for surface mount applications.
ABSOLUTE MAXIMUM RATINGS
(T
case
= 25擄C unless otherwise stated)
V
IN
P
D
R
q
JC
R
q
JC
R
q
JC
T
J
T
STG
T
LEAD
Input 鈥?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.)
Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail:
sales@semelab.co.uk
Website:
http://www.semelab.co.uk
35V
Internally limited *
TO鈥?
TO鈥?
SMD1
SMD1
TO鈥?57
TO鈥?57
Control
Power
Control
Power
Control
Power
Control
Power
0.93擄C / W
3.0擄C / W
0.79擄C / W
4.0擄C / W
0.79擄C / W
4.0擄C / W
鈥?5 to 150擄C
鈥?5 to 200擄C
鈥?5 to 150擄C
300擄C
Prelim. 7/00
* These ratings are only applicable for power dissipations of 30 Watts over a limited range of V
IN
鈥?V
OUT
.
Semelab plc.
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2
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