Datasheet

2
LT1170/LT1171/LT1172
117012ff
*θ will vary from
approximately
25°C/W with 2.8
sq. in. of 1oz.
copper to 45°C/W
with 0.20 sq. in. of
1oz. copper.
Somewhat lower
values can be
obtained with
additional copper
layers in multilayer
boards.
LT1172CN8
LT1172IN8
LT1172CS8
LT1172IS8
S8 PART MARKING
Supply Voltage
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
ORDER PART
NUMBER
T
JMAX
= 100°C, θ
JA
= *°C/W
LT1170CQ
LT1170IQ
LT1170HVCQ
LT1171CQ
LT1171IQ
LT1171HVCQ
LT1171HVIQ
LT1172CQ
LT1172HVCQ
LT1172HVIQ
T
JMAX
= 100°C, θ
JA
= 100°C/W (N)
T
JMAX
= 100°C, θ
JA
= 120°C/W to 150°C/W
depending on board layout (S)
1172
1172I
* Do not connect Pin 4 of the LT1172 DIP or SO to external
circuitry. This pin may be active in future revisions.
Operating Junction Temperature Range
LT1170/71/72M (OBSOLETE) .. –55°C to 150°C
LT1170/71/72HVC,
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,
LT1170/71/72I (Oper.) .......... –40°C to 100°C
LT1170/71/72HVI,
LT1170/71/72I (Sh. Ckt.) ...... –40°C to 125°C
(Note 1)
T
JMAX
θ
JC
θ
JA
LT1170CT/LT1170HVCT 100°C2°C/W 75°C/W
LT1171CT/LT1171HVCT 100°C4°C/W 75°C/W
LT1172CT/LT1172HVCT 100°C8°C/W 75°C/W
Based on continuous operation.
T
JMAX
= 125°C for intermittent fault conditions.
LT1170CT
LT1170IT
LT1170HVCT
LT1170HVIT
LT1171CT
LT1171IT
LT1171HVCT
LT1171HVIT
LT1172CT
LT1172HVCT
T
JMAX
= 100°C, θ
JA
= 150°C/W
Based on continuous operation.
T
JMAX
= 125°C for intermittent fault conditions.
LT1172CSW
ORDER PART
NUMBER
Q PACKAGE
5-LEAD DD
V
IN
V
SW
GND
FB
V
C
FRONT VIEW
5
4
3
2
1
ORDER PART
NUMBER
TOP VIEW
SW PACKAGE
16-LEAD PLASTIC SO WIDE
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
NC
GND
V
C
FB
NC
NC
NC
NC
NC
E2
V
SW
E1
V
IN
NC
NC
T PACKAGE
5-LEAD PLASTIC TO-220
V
IN
V
SW
GND
FB
V
C
FRONT VIEW
5
4
3
2
1
C
I
PACKAGE/ORDER I FOR ATIO
UU
W
ABSOLUTE AXI U RATI GS
WWWU
ORDER PART
NUMBER
N8 PACKAGE
8-LEAD PDIP
1
2
3
4
8
7
6
5
TOP VIEW
GND
V
C
FB
NC*
E2
V
SW
E1
V
IN
S8 PACKAGE
8-LEAD PLASTIC SO