2

LT1170/LT1171/LT1172

*

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.

LT1172MJ8

LT1172CJ8

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

LT1170CQ

LT1170IQ

LT1171CQ

LT1171IQ

LT1170MK

150

°C2°C/W

35

°C/W

LT1170CK

100

°C2°C/W

35

°C/W

LT1171MK

150

°C4°C/W

35

°C/W

LT1171CK

100

°C4°C/W

35

°C/W

LT1172MK

150

°C8°C/W

35

°C/W

LT1172CK

150

°C8°C/W

35

°C/W

Based on continuous operation.

LT1170MK

LT1170CK

LT1171MK

LT1171CK

LT1172MK

LT1172CK

depending on board layout (S)

1172

N8 PACKAGE

8-LEAD PDIP

1

2

3

4

8

7

6

5

TOP VIEW

GND

FB

NC*

E2

E1

J8 PACKAGE

8-LEAD CERDIP

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.

Operating Junction Temperature Range

LT1170/71/72M ......................... – 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)

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.

LT1170CT

LT1170IT

LT1170HVCT

LT1170HVIT

LT1171CT

LT1171IT

LT1171HVCT

LT1172CT

LT1172HVCT

Based on continuous operation.

LT1172CSW

ORDER PART

NUMBER

ORDER PART

NUMBER

ORDER PART

NUMBER

2

4

1

3

FB

CASE

IS GND

K PACKAGE

4-LEAD TO-3 METAL CAN

BOTTOM VIEW

Q PACKAGE

5-LEAD DD

GND

FB

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

FB

NC

NC

NC

NC

NC

E2

E1

NC

NC

T PACKAGE

5-LEAD PLASTIC TO-220

GND

FB

FRONT VIEW

5

4

3

2

1

1172I

LT1171HVCQ

LT1172CQ

LT1172HVIQ

C

I

PACKAGE/ORDER I FOR ATIO

ABSOLUTE

AXI U

RATI GS