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LT4351

sn4351 4351fs

VIN Voltage ............................................... – 0.3V to 19V

OUT Voltage ............................................ – 0.3V to 19V

VDD Voltage ............................................. – 0.3V to 30V

FAULT, STATUS Voltages ........................ – 0.3V to 30V

FAULT, STATUS Current ........................................ 8mA

UV, OV Voltages ........................................ – 0.3V to 9V

SW Voltage .............................................. – 0.3V to 32V

Operating Temperature Range

LT4351C .................................................. 0

°C to 70°C

LT4351I .............................................. – 40

°C to 85°C

Junction Temperature (Note 2) ............................ 125

°C

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

°C to 150°C

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

°C

ORDER PART

NUMBER

MS PART MARKING

TJMAX = 125°C, θJA = 120°C/W

LTZZ

LTA1

LT4351CMS

LT4351IMS

(Note 1)

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

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

The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT = 5V, VDD = 16.1V, VUV = 0.4V, VOV = 0.2V, GATE Open,

unless otherwise specified.

ELECTRICAL CHARACTERISTICS

GATE

VDD

VIN

GND

OUT

STATUS

FAULT

TOP VIEW

MS PACKAGE

10-LEAD PLASTIC MSOP

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Supply and Protection

VIN

Operating Range

1.2

IVIN

VIN Supply Current

VIN = 1.2V, VOUT = 1.1V, VDD = 12.3V

1.41

2.0

VIN = 18V, VOUT = 17.9V, VDD = 29.1V

1.71

2.1

VUV(TH)

Undervoltage Turn-Off Voltage Threshold

UV Falling

290

300

310

IUV(HYST)

IUV Hysteresis

Difference Between IUV at VUV(TH) + 10mV

710

µA

and VUV(TH) – 10mV

IUV

UV Input Bias Current

VUV = VUV(TH) + 10mV

–100

–400

VOV(TH)

Overvoltage Threshold

OV Rising

290

300

310

IOV

OV Input Bias Current

VOV = VOV(TH) – 10mV

–100

–400

VF(ON)

FAULT Pin On Voltage

IF = 5mA In Fault Condition

0.14

0.25

IF(OFF)

FAULT Pin Leakage Current

VF = 30V, VIN = 4.9V

0.04

µA

Boost Supply

VBR

Boost Regulation Trip Voltage

Measured as VDD to VIN, Rising Edge

10.2

10.7

11.1

tOFF

Boost Supply Off Time

600

ISWLIM

Boost Supply Switch Current Limit

350

450

650

Gate Drive

VIOR

Input to Output Regulated Voltage

415

∆VGL

Gate Voltage Limit

VIN = 5V, VOUT = 4.9V, VDD = 13V Measured with

–2.3

–3

Respect to VDD

∆VG(MAX)

Maximum Gate Voltage

VIN = 5V, VOUT = 4.9V, VDD = 16.1V Measured with q

7.4

7.8

Respect to VOUT

VGOFF

Gate Off Voltage

VOUT = 5.1V

0.16

0.30

IGSO

Gate Source Current

VOUT = 4.9V, VGATE = 9V

0.670

IGSK

Gate Sink Current

VOUT = 4.9V, VGATE = 9V

0.670

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