Datasheet

2
LT1185
1185ff
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
2
4
1
3
GND FB
REF
V
IN
(CASE)
V
OUT
K PACKAGE
4-LEAD TO-3 METAL CAN
BOTTOM VIEW
ORDER PART
NUMBER
LT1185MK
ORDER PART
NUMBER
LT1185CT
LT1185IT
θ
JC MAX
= 2.5°C/W, θ
JA
= 50°C/W
T PACKAGE
5-LEAD PLASTIC TO-220
REF
V
OUT
V
IN
FB
GND
FRONT VIEW
TAB IS V
IN
5
4
3
2
1
θ
JC MAX
= 2.5°C/W, θ
JA
= 35°C/W
*See Application Section for details on calculating Operation Junction Temperature
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
(Note 1)
OBSOLETE PACKAGE
ORDER PART
NUMBER
LT1185CQ
LT1185IQ
T
JMAX
= 150°C, θ
JA
= 30°C/W
Q PACKAGE
5-LEAD PLASTIC DD
FRONT VIEW
TAB
IS
V
IN
REF
V
OUT
V
IN
FB
GND
5
4
3
2
1
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage (At FB Pin) 2.37 V
Reference Voltage Tolerance (At FB Pin) (Note 2) V
IN
– V
OUT
= 5V, V
OUT
= V
REF
0.3 ±1%
1mA ≤ I
OUT
≤ 3A ● 1 ±2.5 %
V
IN
– V
OUT
= 1.2V to V
IN
= 30V
P ≤ 25W (Note 6), V
OUT
= 5V
T
MIN
≤ T
J
≤ T
MAX
(Note 9)
Feedback Pin Bias Current V
OUT
= V
REF
● 0.7 2 µA
Droput Voltage (Note 3) I
OUT
= 0.5A, V
OUT
= 5V 0.20 0.37 V
I
OUT
= 3A, V
OUT
= 5V 0.67 1.00 V
The ● denotes specifications which apply over the operating temperature range, otherwise specifications are at T
A
= 25°C.
Adjustable version, V
IN
= 7.4V, V
OUT
= 5V, I
OUT
= 1mA, R
LIM
= 4.02k, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Input Voltage .......................................................... 35V
Input-Output Differential ......................................... 30V
FB Voltage ................................................................ 7V
REF Voltage .............................................................. 7V
Output Voltage ........................................................ 30V
Output Reverse Voltage ............................................ 2V
Operating Ambient Temperature Range
LT1185C ............................................... 0°C to 70°C
LT1185I ............................................. –40°C to 85°C
LT1185M (OBSOLETE) .................... –55°C to 125°C
Operating Junction Temperature Range*
Control Section
LT1185C ............................................. 0°C to 125°C
LT1185I .......................................... – 40°C to 125°C
LT1185M (OBSOLETE) ................... –55°C to 150°C
Power Transistor Section
LT1185C ............................................. 0°C to 150°C
LT1185I .......................................... – 40°C to 150°C
LT1185M (OBSOLETE) ................... –55°C to 175°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C