LT1170/LT1171/LT1172
W W U W
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage
Operating Junction Temperature Range
LT1170/71/72M......................... –55°C to 150°C
LT1170/71/72HVC,
LT1170/71/72HV (Note 2) .................................. 60V
LT1170/71/72 (Note 2)....................................... 40V
Switch Output Voltage
LT1170/71/72HV ................................................ 75V
LT1170/71/72..................................................... 65V
LT1172S8........................................................... 60V
Feedback Pin Voltage (Transient, 1ms) ................ ±15V
Storage Temperature Range ............... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
LT1170/71/72C (Oper.) .............. 0°C to 100°C
LT1170/71/72HVC
LT1170/71/72C (Sh. Ckt.) .......... 0°C to 125°C
LT1170/71/72HVI,
C
I
LT1170/71/72I (Oper.) .......... –40°C to 100°C
LT1170/71/72HVI,
LT1170/71/72I (Sh. Ckt.) ...... –40°C to 125°C
U W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
TOP VIEW
ORDER PART
NUMBER
ORDER PART
NC
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
NC
E2
V
GND
1
2
3
4
E2
V
8
7
6
5
NUMBER
V
C
SW
GND
FB
E1
V
LT1172MJ8
LT1172CJ8
LT1172CN8
LT1172IN8
LT1172CS8
LT1172IS8
LT1172CSW
V
C
SW
NC*
IN
FB
NC
NC
NC
E1
J8 PACKAGE
8-LEAD CERDIP
N8 PACKAGE
8-LEAD PDIP
V
IN
NC
NC
S8 PACKAGE
8-LEAD PLASTIC SO
* Do not connect Pin 4 of the LT1172 DIP or SO to external
circuitry. This pin may be active in future revisions.
SW PACKAGE
16-LEAD PLASTIC SO WIDE
TJMAX = 150°C, θJA = 100°C/W (J)
TJMAX = 100°C, θJA = 100°C/W (N)
JMAX = 100°C, θJA = 120°C/W to 150°C/W
depending on board layout (S)
TJMAX = 100°C, θJA = 150°C/W
S8 PART MARKING
1172 1172I
Based on continuous operation.
TJMAX = 125°C for intermittent fault conditions.
T
ORDER PART
NUMBER
ORDER PART
NUMBER
BOTTOM VIEW
FRONT VIEW
V
V
C
SW
5
4
3
2
1
V
V
IN
1
4
2
3
CASE
IS GND
SW
LT1170MK
LT1170CK
LT1171MK
LT1171CK
LT1172MK
LT1172CK
LT1170CT
LT1170IT
GND
FB
V
FB
IN
K PACKAGE
4-LEAD TO-3 METAL CAN
V
C
LT1170HVCT
LT1170HVIT
LT1171CT
T PACKAGE
5-LEAD PLASTIC TO-220
TJMAX
θJC
θJA
LT1170MK
LT1170CK
LT1171MK
LT1171CK
LT1172MK
LT1172CK
150°C 2°C/W 35°C/W
100°C 2°C/W 35°C/W
150°C 4°C/W 35°C/W
100°C 4°C/W 35°C/W
150°C 8°C/W 35°C/W
150°C 8°C/W 35°C/W
TJMAX
θJC
θJA
LT1170CT/LT1170HVCT
LT1171CT/LT1171HVCT
LT1172CT/LT1172HVCT
100°C 2°C/W 75°C/W
100°C 4°C/W 75°C/W
100°C 8°C/W 75°C/W
LT1171IT
LT1171HVCT
LT1172CT
Based on continuous operation.
TJMAX = 125°C for intermittent fault conditions.
Based on continuous operation.
TJMAX = 125°C for intermittent fault conditions.
LT1172HVCT
*θ will vary from
ORDER PART
NUMBER
approximately
FRONT VIEW
25°C/W with 2.8
sq. in. of 1oz.
5
4
3
2
1
V
V
GND
FB
IN
SW
copper to 45°C/W
with 0.20 sq. in. of
1oz. copper.
Somewhat lower
values can be
obtained with
LT1170CQ
LT1170IQ
LT1171CQ
LT1171HVCQ
LT1172CQ
LT1172HVIQ
V
C
Q PACKAGE
5-LEAD DD
additional copper LT1171IQ
TJMAX = 100°C, θJA = *°C/W
layers in multilayer
boards.
2
Linear [ Linear ]
