Datasheet

LT1170/LT1171/LT1172
2
117012fg
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
LT1170/LT1171/LT1172HV (Note 2) .......................60V
LT1170/LT1171/LT1172 (Note 2) ............................40V
Switch Output Voltage
LT1170/LT1171/LT1172HV .....................................75V
LT1170/LT1171/LT1172 .........................................65V
LT1172S8 ..............................................................60V
Feedback Pin Voltage (Transient, 1ms) ................... ±15V
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec ....................300°C
(Note 1)
PIN CONFIGURATION
Operating Junction Temperature Range
LT1170M/LT1171M (OBSOLETE) ....... –55°C to 150°C
LT1172M ............................................ –55°C to 125°C
LT1170/LT1171/LT1172HVC,
LT1170/LT1171/LT1172C (Oper.) ............. 0°C to 100°C
LT1170/LT1171/LT1172HVC
LT1170/LT1171/LT1172C (Sh. Ckt.) ........ 0°C to 125°C
LT1170/LT1171/LT1172HVI,
LT1170/LT1171/LT1172I (Oper.) ..........–40°C to 100°C
LT1170/LT1171/LT1172HVI,
LT1170/LT1171/LT1172I (Sh. Ckt.) ...... –40°C to 125°C
1
2
3
4
8
7
6
5
TOP VIEW
GND
V
C
FB
NC*
E2
V
SW
E1
V
IN
J8 PACKAGE
8-LEAD CERDIP
T
JMAX
= 125°C, θ
JA
= 100°C/W
* Do not connect Pin 4 of the LT1172 DIP or SO to external
circuitry. This pin may be active in future revisions.
2
4
1
3
V
SW
V
C
FB
CASE
IS GND
V
IN
K PACKAGE
4-LEAD TO-3 METAL CAN
BOTTOM VIEW
LT1170MK: T
JMAX
= 150°C, θ
JC
= 2°C/W, θ
JA
= 35°C/W
LT1170CK: T
JMAX
= 100°C, θ
JC
= 2°C/W, θ
JA
= 35°C/W
LT1171MK: T
JMAX
= 150°C, θ
JC
= 4°C/W, θ
JA
= 35°C/W
LT1171CK: T
JMAX
= 100°C, θ
JC
= 4°C/W, θ
JA
= 35°C/W
LT1172MK: T
JMAX
= 150°C, θ
JC
= 8°C/W, θ
JA
= 35°C/W
LT1172CK: T
JMAX
= 100°C, θ
JC
= 8°C/W, θ
JA
= 35°C/W
Based on continuous operation.
T
JMAX
= 125°C for intermittent fault conditions.
OBSOLETE
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
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)
* Do not connect Pin 4 of the LT1172 DIP or SO to external
circuitry. This pin may be active in future revisions.
Q PACKAGE
5-LEAD DD
V
IN
V
SW
GND
FB
V
C
FRONT VIEW
5
4
3
2
1
T
JMAX
= 100°C, θ
JA
= *°C/W
* 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.
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
JMAX
= 100°C, θ
JA
= 150°C/W
Based on continuous operation.
T
JMAX
= 125°C for intermittent fault conditions.
T PACKAGE
5-LEAD PLASTIC TO-220
V
IN
V
SW
GND
FB
V
C
FRONT VIEW
5
4
3
2
1
LT1170CT/LT1170HVCT: T
JMAX
=100°C, θ
JC
= 2°C/W, θ
JA
= 75°C/W
LT1171CT/LT1171HVCT: T
JMAX
=100°C, θ
JC
= 4°C/W, θ
JA
= 75°C/W
LT1172CT/LT1172HVCT: T
JMAX
=100°C, θ
JC
= 8°C/W, θ
JA
= 75°C/W
Based on continuous operation.
T
JMAX
= 125°C for intermittent fault conditions.