LT4254_15 datasheet(2/16 Pages) LINER

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LT4254

4254fb

Supply Voltage (VCC) .................................. – 0.3 to 44V

SENSE, PWRGD ......................................... – 0.3 to 44V

GATE .......................................................... – 0.3 to 50V

FB, UV, OPEN ............................................. – 0.3 to 44V

OV .............................................................. – 0.3 to 18V

RETRY ........................................................ – 0.3 to 15V

TIMER ..................................................... – 0.3V to 4.3V

Maximum Input Current (TIMER) ....................... 100

µA

Operating Temperature

LT4254C ................................................. 0

°C to 70°C

LT4254I ............................................. – 40

°C to 85°C

Storage Temperature Range ................ – 65

°C to 150°C

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

°C

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 24V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC

Operating Voltage

●

10.8

ICC

Operating Current

1.9

UVLH

Undervoltage Threshold

VCC Low-to-High Transition

●

3.96

4.04

VUVHYS

Hysteresis

0.25

0.4

0.55

IINUV

UV Input Current

UV = 4.5V

–0.1

–1

µA

UV = 0V

–1.5

–3

µA

VOVHL

Overvoltage Threshold

VCC Low-to-High Transition

●

3.96

4.04

VOVHYS

Hysteresis

0.25

0.4

0.55

IINOV

OV Input Current

≤ OV < 6.5V

0.1

µA

VOPEN

Open-Circuit Voltage Threshold (VCC – VSENSE)

●

3.5

VOLOPEN

OPEN Output Low Voltage

IO = 2mA

0.20

0.5

IO = 5mA

0.75

1.3

IINOPEN

Leakage Current

VOPEN = 5V

0.1

µA

VSENSETRIP

SENSE Pin Trip Voltage (VCC – VSENSE)

FB = 0V

●

5.5

≥ 2V

●

IINSNS

SENSE Pin Input Current

µA

IPU

GATE Pull-Up Current

Charge Pump On,

∆VGATE = 7V

●

–15

– 35

– 63

µA

IPD

GATE Pull-Down Current

Any Fault, VGATE = 3V

∆VGATE

External N-Channel Gate Drive (Note 2)

VGATE – VCC, 12V ≤ VCC ≤ 20V

●

4.5

8.8

12.5

20V

≤ VCC ≤ 36V

●

12.5

VFB

FB Voltage Threshold

FB High-to-Low Transition

●

3.96

4.04

FB Low-to-High Transition

●

4.20

4.45

4.65

VFBHYS

FB Hysteresis Voltage

0.3

0.45

0.60

VOLPGD

PWRGD Output Low Voltage

IO = 1.6mA

0.25

0.4

IO = 5mA

0.63

1.0

ORDER PART NUMBER

GN PART MARKING

4254

4254I

LT4254CGN

LT4254IGN

Consult LTC Marketing for parts specified with wider operating temperature ranges.

Note: NC = No Connect

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/

GN PACKAGE

16-LEAD PLASTIC TSSOP

TOP VIEW

OPEN

PWRGD

RETRY

GND

VCC

SENSE

GATE

TIMER

TJMAX = 125°C, θJA = 130°C/W

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