LTC3857 datasheet(2/38 Pages) LINER

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LTC3857

3857fa

pin conFiguraTion

absoluTe MaxiMuM raTings

(Note 1)

32 31 30 29 28 27 26 25

9 10 11 12 13 14 15 16

TOP VIEW

SENSE1–

FREQ

PHASMD

CLKOUT

PLLIN/MODE

SGND

RUN1

RUN2

BOOST1

BG1

VIN

PGND

EXTVCC

INTVCC

BG2

BOOST2

UH PACKAGE

32-LEAD (5mm 5mm) PLASTIC QFN

SGND

TJMAX=125°C,θJA=34°C/W

EXPOSEDPAD(PIN33)ISSGND,MUSTBESOLDEREDTOPCB

orDer inForMaTion

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LTC3857EUH#PBF

LTC3857EUH#TRPBF

3857

32-Lead(5mm

×5mm)PlasticQFN

–40°Cto125°C

LTC3857IUH#PBF

LTC3857IUH#TRPBF

3857

32-Lead(5mm

×5mm)PlasticQFN

–40°Cto125°C

ConsultLTCMarketingforpartsspecifiedwithwideroperatingtemperatureranges.*Thetemperaturegradeisidentifiedbyalabelontheshippingcontainer.

ConsultLTCMarketingforinformationonnon-standardleadbasedfinishparts.

Formoreinformationonleadfreepartmarking,goto:http://www.linear.com/leadfree/

Formoreinformationontapeandreelspecifications,goto:http://www.linear.com/tapeandreel/

InputSupplyVoltage(VIN)......................... –0.3Vto40V

TopsideDriverVoltages

BOOST1,BOOST2................................ –0.3Vto46V

SwitchVoltage(SW1,SW2)........................ –5Vto40V

(BOOST1-SW1),(BOOST2-SW2),INTVCC... –0.3Vto6V

RUN1,RUN2................................................ –0.3Vto8V

MaximumCurrentSourcedintoPin

fromSource>8V...............................................100µA

SENSE1+,SENSE2+,SENSE1–

SENSE2–Voltages...................................... –0.3Vto28V

PLLIN/MODE,FREQVoltages.............. –0.3VtoINTVCC

ILIM,PHASMDVoltages....................... –0.3VtoINTVCC

EXTVCC...................................................... –0.3Vto14V

ITH1,ITH2,VFB1,VFB2Voltages...................... –0.3Vto6V

PGOOD1,PGOOD2Voltages....................... –0.3Vto6V

TRACK/SS1,TRACK/SS2Voltages.............. –0.3Vto6V

OperatingJunctionTemperatureRange

(Note2................................................... –40°Cto125°C

MaximumJunctionTemperature(Note3)............ 125°C

StorageTemperatureRange................... –65°Cto150°C

elecTrical characTerisTics

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN

InputSupplyOperatingVoltageRange

VFB1,2

RegulatedFeedbackVoltage

(Note4)ITH1,2Voltage=1.2V

–40°Cto125°C

–40°Cto85°C

0.788

0.792

0.800

0.812

0.808

IFB1,2

FeedbackCurrent

(Note4)

±5

±50

VREFLNREG

ReferenceVoltageLineRegulation

(Note4)VIN=4.5Vto38V

0.002

0.02

%/V

The l denotes the specifications which apply over the full operating

junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN1,2 = 5V, EXTVCC = 0V unless otherwise noted.

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