LT3744 datasheet(2/30 Pages) LINEAR

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LT3922

3922f

For more information www.linear.com/LT3922

pin conFiguraTion

absoluTe MaxiMuM raTings

VIN and EN/UVLO......................................................40V

ISP, ISN, and VOUT ....................................................40V

ISP – ISN .................................................................0.3V

CTRL and FB............................................................3.3V

OVLO, PWM, SYNC/SPRD, and FAULT........................6V

SS and VC ................................................................3.3V

SW............................................................................40V

BST...........................................................................43V

BST – SW ...................................................................3V

INTVCC, VREF, ISMON, PWMTG, RT, and RP......(Note 2)

Operating Junction Temperature Range (Notes 3, 4)

LT3922E/LT3922I .................................. –40 to 125°C

LT3922H................................................–40 to 150°C

Storage Temperature Range ......................–60 to 150°C

(Note 1)

9 10

TOP VIEW

UFD PACKAGE

28-LEAD (4mm

× 5mm) PLASTIC QFN

11 12 13

28 27 26 25

GND

BST

INTVCC

VIN

EN/UVLO

OVLO

VREF

CTRL

GND

VOUT

PWMTG

PWM

SYNC/SPRD

FAULT

θJA = 34°C/W

EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB

elecTrical characTerisTics The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, VEN/UVLO = 2V unless otherwise noted.

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LT3922EUFD#PBF

LT3922EUFD#TRPBF

3922

28-Lead (4mm × 5mm) Plastic QFN

–40°C to 125°C

LT3922IUFD#PBF

LT3922IUFD#TRPBF

3922

28-Lead (4mm × 5mm) Plastic QFN

–40°C to 125°C

LT3922HUFD#PBF

LT3922HUFD#TRPBF

3922

28-Lead (4mm × 5mm) Plastic QFN

–40°C to 150°C

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

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through

designated sales channels with #TRMPBF suffix.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Voltage Range

2.8

VIN Pin Quiescent Current

VEN/UVLO = 1.5V, Not Switching

VEN/UVLO = 0.1V, Shutdown

2.9

µA

EN/UVLO Threshold (Falling)

1.260

1.330

1.400

EN/UVLO Rising Hysteresis

EN/UVLO Pin Current

VEN/UVLO = 1.2V

µA

Input OVLO Threshold (Rising)

1.145

1.205

1.265

Input OVLO Falling Hysteresis

OVLO Pin Current

VOVLO = 1.0V

–100

100

orDer inForMaTion http://www.linear.com/product/LT3922#orderinfo

LT3744 Datasheet(PDF) 2 Page - Linear Integrated Systems

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