LTC4257

2

4257fb

TOP VIEW

DD PACKAGE

8-LEAD (3mm

× 3mm) PLASTIC DFN

5

6

7

8

4

3

2

1

NC

NC

GND

NC

PWRGD

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage

Voltage with Respect to GND Pin (Notes 4, 5, 6)

Maximum Operating Voltage

●

–57

V

Signature Range

●

– 1.5

– 9.5

V

Classification Range

– 21

V

UVLO Turn-On Voltage

–39.2

– 40.2

V

UVLO Turn-Off Voltage

–30.5

– 31.5

V

IC Supply Current when ON

●

3mA

●

0.35

0.50

0.65

mA

(Note 7)

●

±3.5

%

(Notes 8, 9)

(Notes 1, 2)

PWRGD Current .................................................. 10mA

The

ABSOLUTE

AXI U

RATI GS

ELECTRICAL CHARACTERISTICS

Operating Ambient Temperature Range

LTC4257C ............................................... 0

°C to 70°C

LTC4257I ............................................. –40

°C to 85°C

Storage Temperature Range

S8 Package ....................................... – 65

°C to 150°C

DD Package ...................................... – 65

°C to 125°C

Lead Temperature (Soldering, 10 sec).................. 300

°C

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grades are identified by a label on the shipping container.

ORDER PART NUMBER

S8 PART MARKING

4257

4257I

LTC4257CS8

LTC4257IS8

1

2

3

4

8

7

6

5

TOP VIEW

GND

NC

PWRGD

NC

NC

S8 PACKAGE

8-LEAD PLASTIC SO

PACKAGE/ORDER I FOR ATIO

ORDER PART NUMBER

DD PART MARKING*

EXPOSED PAD TO BE SOLDERED TO

ELECTRICALLY ISOLATED PCB HEATSINK

LACT

LTC4257CDD

LTC4257IDD

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/