Datasheet

2
LT1083/84/85 Fixed
Power Dissipation............................... Internally Limited
Input Voltage (Note 1) ............................................. 30V
Operating Input Voltage
3.3V, 3.6V Devices ............................................ 20V
5V Devices ........................................................ 20V
12V Devices ...................................................... 25V
Operating Junction Temperature Range
“C” Grades
Control Section ............................... 0°C to 125°C
Power Transistor............................. 0°C to 150°C
“M” Grades
Control Section ...........................–55°C to 150°C
Power Transistor.........................–55°C to 200°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ABSOLUTE MAXIMUM RATINGS
W
WW
U
100% Thermal Limit Functional Test.
PRECONDITIONING
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Note 1: Although the devices maximum operating voltage is limited, (20V
for a 3V, 5V device, and 25V for a 12V device) the devices are guaranteed
to withstand transient input voltages up to 30V. For input voltages greater
than the maximum operating input voltage some degradation of
specifications will occur. For input/output voltage differentials greater than
15V, a minimum external load of 5mA is required to maintain regulation.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage LT1084-3.3 I
OUT
= 0mA, T
J
= 25°C, V
IN
= 8V (K Package Only) 3.270 3.300 3.330 V
0 ≤ I
OUT
≤ 5A, 4.8V ≤ V
IN
≤ 15V (Note 8) ● 3.235 3.300 3.365 V
LT1085-3.3 V
IN
= 5V, I
OUT
= 0mA, T
J
= 25°C (K Package Only) 3.270 3.300 3.330 V
4.8V ≤ V
IN
≤ 15V, 0 ≤ I
OUT
≤ 3A (Note 8) ● 3.235 3.300 3.365 V
LT1085-3.6 V
IN
= 5V, I
OUT
= 0mA, T
J
= 25°C (K Package Only) 3.564 3.600 3.636 V
5V ≤ V
IN
≤ 15V, 0 ≤ I
OUT
≤ 3A (Note 8) ● 3.500 3.672 V
5V ≤ V
IN
≤ 15V, 0 ≤ I
OUT
≤ 3A, TJ ≥ 0°C (Note 8) 3.528 3.672 V
ELECTRICAL CHARACTERISTICS
PACKAGE/ORDER INFORMATION
W
U
U
ORDER PART NUMBER ORDER PART NUMBER
LT1083CP-5
LT1083CP-12
LT1084CP-5
LT1084CP-12
LT1083CK-5
LT1083CK-12
LT1083MK-5
LT1083MK-12
LT1084CK-5
LT1084CK-12
LT1084MK-5
LT1084MK-12
LT1085CK-5
LT1085CK-12
LT1085MK-5
LT1085MK-12
θ
JA
= 35°C/W
θ
JA
= 45°C/W
θ
JA
= 50°C/W
1
2
V
IN
CASE IS
OUTPUT
GND
K PACKAGE
2-LEAD TO-3 METAL CAN
T PACKAGE
3-LEAD PLASTIC TO-220
FRONT VIEW
TAB IS
OUTPUT
3
2
1
V
IN

V
OUT

GND
V
IN

V
OUT

GND
P PACKAGE
3-LEAD TO-3P PLASTIC
FRONT VIEW
TAB IS
OUTPUT
3
2
1
LT1084CT-3.3
LT1084CT-5
LT1084CT-12
LT1085CT-3.3
LT1085CT-3.6
LT1085CT-5
LT1085CT-12
LT1085CM-3.3
LT1085CM-3.6
V
IN


V
OUT


GND
M PACKAGE
3-LEAD PLASTIC DD
FRONT VIEW
TAB IS
OUTPUT
3

2

1
θ
JA
= 30°C/W*
*WITH PACKAGE SOLDERED TO 0.52IN
2
COPPER AREA OVER BACKSIDE GROUND
PLANE OR INTERNAL POWER PLANE. θ
JA
CAN
VARY FROM 20°C/W TO > 40°C/W DEPENDING
ON MOUNTING TECHNIQUE.
Consult factory for Industrial grade parts.