LT4256-3 datasheet(2/20 Pages) LINER

Part #	LT4256-3

Description	Positive High Voltage Hot Swap Controller with Open-Circuit Detect

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Manufacturer	LINER [Linear Technology]

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LT4256-3

2

42563f

(Note 1)

Supply Voltage (VCC) ................................ – 0.3 to 100V

SENSE, PWRGD ....................................... – 0.3 to 100V

GATE Voltage (Note 2) .................... – 0.3V to VCC + 10V

GATE Maximum Current ..................................... 200

µA

VOUT .......................................................... –3V to 100V

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

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

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

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

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

µA

Operating Temperature

LT4256-3C ............................................. 0

°C to 70°C

LT4256-3I ......................................... – 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

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

PACKAGE/ORDER I FOR ATIO

ORDER PART

NUMBER

GN PART MARKING

42563

42563I

LT4256-3CGN

LT4256-3IGN

1

2

3

4

5

6

7

8

TOP VIEW

GN PACKAGE

16-LEAD PLASTIC SSOP

16

15

14

13

12

11

10

9

UV

OV

NC

OPEN

PWRGD

NC

RETRY

GND

VCC

SENSE

NC

GATE

VOUT

NC

FB

TIMER

TJMAX = 125°C, θJA = 130°C/W

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

temperature range, otherwise specifications are at TA = 25°C. VCC = 48V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC

Operating Voltage

q

10.8

80

V

ICC

Operating Current

1.8

3.9

mA

VUVLH

Undervoltage Threshold

VCC Low-to-High Transition

q

3.96

4

4.04

V

VUVHYS

Hysteresis

0.25

0.4

0.55

V

IINUV

UV Input Current

UV

≥ 1.2V

–0.1

–1

µA

UV = 0V

–1.5

–3

µA

VUVRTH

Fault Latch Reset Threshold Voltage

q

0.4

0.85

1.2

V

VOVLH

Overvoltage Threshold

VCC Low-to-High Transition

q

3.96

4

4.04

V

VOVHYS

Hysteresis

0.25

0.4

0.55

V

IINOV

OV Input Current

0V

≤ OV < 7V

0.1

1

µA

VOPEN

Open-Circuit Voltage Threshold (VCC – VSENSE)

q

1.5

3

6.5

mV

VOLOPEN

OPEN Output Low Voltage

IO = 2mA

0.20

0.5

V

IO = 5mA

0.75

1.3

V

IINOPEN

Leakage Current

VOPEN = 5V

0.1

1

µA

VSENSETRIP

SENSE Pin Trip Voltage (VCC – VSENSE)

FB = 0V

q

714

22

mV

FB

≥ 2V

q

45

55

65

mV

IINSNS

SENSE Pin Input Current

VSENSE = VCC

40

70

µA

IPU

GATE Pull-Up Current

Charge Pump On,

∆VGATE = 7V

q

–16

– 30

– 55

µA

IPD

GATE Pull-Down Current

Any Fault, VGATE > VOUT

40

62

80

mA

IPDL

VOUT Pull-Down Current, Fault Condition

Any Fault, VGATE = VOUT + ∆VGATEL,

130

µA

VOUT = 48V

∆VGATE

External N-Channel Gate Drive (Note 2)

VGATE – VOUT, 10.8V ≤ VCC ≤ 20V

q

4.5

8.8

12.5

V

20V

≤ VCC ≤ 80V

q

10

11.6

12.8

V

∆VGATEL

External N-Channel Gate Drive, Fault Condition

VGATE – VOUT, VOUT = 48V

–2

V

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