矽力杰 Silergy SQ27692 4.5-60V 输入 2A 输出高效异步降压稳压器 规格书 (Datasheet)佰祥电子

SQ27692

HighEfficiency,60VInput,2A

AsynchronousStepDownRegulator

GeneralDescriptionFeatures

TheSQ27692developsahighefficiency,currentmodeLowRDS(ON)forInternalN-channelPowerFET

adaptiveconstantOFFtimecontrolled,asynchronous(TOP):175mΩ

step-downDC/DCconvertercapableofdelivering2A4.5-60VInputVoltageRange

outputcurrent.TheSQ27692operatesoverawide2AOutputCurrentCapability

inputvoltagerangefrom4.5Vto60VandintegratesAdjustableSwitchingFrequencyRange:

mainswitchwithverylowRDS(ON)tominimizethe100kHzto1MHz

conductionloss.TheswitchingfrequencyisadjustableInternalSoft-startLimitstheInrushCurrent

from100kHzto1MHzusinganexternalresistor.AndHic-cupModeOutputShortCircuitProtection

thedevicefeaturescycle-by-cyclepeakcurrent

ENON/OFFControlwithAccurateThreshold

limitation.

Cycle-by-cyclePeakCurrentLimit

0.8V±1.5%ReferenceVoltageAccuracy

OrderingInformationCompactPackage:SO8E

OrderingNumberPackagetypeNote

SQ27692FCCSO8E--Applications

Non-isolatedTelecommunicationBuck

Regulator

SecondaryHighVoltagePostRegulator

AutomotiveSystems

ElectricBicycle

TypicalApplications

Efficiencyvs.OutputCurrent

(IOUT=0~2A,fsw=500kHz，L=10µH/PCMB104T-100MS)

100

CBS

90

80

L1(%)

VINBSVOUT

INLX

70

CINON/CFF

ENCOUT

OFFR1Efficiency60

V=7V,V=5V

RPGINOUT

PGFBVIN=12V,VOUT=5V

50VIN=24V,VOUT=5V

FSR2VIN=48V,VOUT=5V

GND

RFS40

0.0010.010.112

OutputCurrent(A)

Figure1.SchematicDiagramFigure2.Efficiencyvs.OutputCurrent

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SQ27692

Pinout(topview)

IN18LX

EN27BS

Exposed

Pad

FS36PG

GND45FB

(SO8E)

TopMark:DURxyz(Devicecode:DUR;x=yearcode,y=weekcode,z=lotnumbercode)

PinNamePinNumberPinDescription

IN1Inputpin.DecouplethispintotheGNDpinwithatleasta1μFceramiccapacitor.

EN2Enablecontrol.Pulledhightoturnon.Donotleaveitfloating.

Frequencyprogrammingpin.Connectaresistortogroundtoprogramaswitching

FS3frequencybetween100kHzto1MHz.Theswitchingfrequencyequalsto:

5

fsw(kHz)=10/RFS(kΩ)

GND4Groundpin.

Outputfeedbackpin.Connectthispintothecenterpointoftheoutputresistor

FB5divider(asshowninFigure1)toprogramtheoutputvoltage:

VOUT=0.8×(1+R1/R2).

Powergoodindicator.Open-drainoutputwhentheoutputvoltageiswithin90%

PG6

to120%oftheregulationpoint.

Boot-strappin.Supplyhighsidegatedriver.Connecta0.1μFceramiccapacitor

BS7

betweentheBSpinandtheLXpin.

LX8Inductorpin.Connectthispintotheswitchingnodeoftheinductor.

ExposedExposedpadmustbeconnectedtotheGNDpin.Connectedtosystemground

/

Padplaneonapplicationboardforoptimalthermalperformance.

BlockDiagram

IN

CurrentSense

Comp

CurrentLimitation

InternalInputVCC

PowerUVLOBS

PowerFET

VCC

ENLX

EnablePWMControl

Threshold&OTP

Protection

OFFTimer

FSLogicSCP

InternalPG

SST

VREF

FB

EAGND

Figure3.BlockDiagram

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SQ27692

AbsoluteMaximumRatings(Note1)

SupplyInputVoltage-------------------------------------------------------------------------------------------------0.3Vto66V

BS-LXVoltage--------------------------------------------------------------------------------------------------------0.3Vto6V

FB,PG,LXVoltage------------------------------------------------------------------------------------------0.3VtoVIN+0.3V

EN,FS--------------------------------------------------------------------------------------------------------------------0.3Vto60V

PowerDissipation,PD@TA=25°C,SO8E-------------------------------------------------------------------------------2.38W

PackageThermalResistance(Note2)

θJA----------------------------------------------------------------------------------------------------------------42°C/W

JC-----------------------------------------------------------------------------------------------------------------4°C/W

JunctionTemperatureRange-------------------------------------------------------------------------------------40°Cto150°C

LeadTemperature(Soldering,10sec.)----------------------------------------------------------------------------------260°C

StorageTemperatureRange--------------------------------------------------------------------------------------65°Cto150°C

DynamicLXvoltagein10nsDuration-----------------------------------------------------------------VIN+3VtoGND-5V

RecommendedOperatingConditions(Note3)

SupplyInputVoltage-------------------------------------------------------------------------------------------------4.5Vto60V

JunctionTemperatureRange-------------------------------------------------------------------------------------40°Cto125°C

AmbientTemperatureRange---------------------------------------------------------------------------------------40°Cto85°C

ElectricalCharacteristics

(VIN=24V,VOUT=5V,L=10μH,COUT=22μF,TJ=-40°Cto125°C,IOUT=0.5Aunlessotherwisespecified.Thevaluesare

guaranteedbytest,designorstatisticalcorrelation.)

ParameterSymbolTestConditionsMinTypMaxUnit

InputVoltageRangeV4.560V

IN

InputUVLOThresholdVUVLO3.94.24.5V

InputUVLOHysteresisV0.3V

HYS

QuiescentCurrentIQVFB=VREF×105%70100130µA

ShutdownCurrentISHDNVEN=0V2616µA

FeedbackReferenceVoltageV788800812mV

REF

FBInputCurrentIV=3.3V-5050nA

FBFB

TopFETRR90175265mΩ

ONDS(ON)

ENRisingThresholdVEN,R11.11.2V

ENFallingThresholdVEN,F0.80.91V

MinONTimet(Note4)150ns

ON,MIN

MinOFFTimet(Note4)250ns

OFF,MIN

Soft-startTimet(Note4)2ms

SS

SwitchingFrequencyProgram

fR=100k~1M1001000kHz

RangeSW,RNGFS

SwitchingFrequencySetting

fR=200k370500630kHz

AccuracySWOSC

VFBfalling,PGfromhightolow869095%VREF

VFBrising,PGfromlowtohigh919299%VREF

PowerGoodThresholdVPG

VFBrising,PGfromhightolow115120124%VREF

VFBfalling,PGfromlowtohigh110115120%VREF

tPG_FHightolow(Note4)20µs

PowerGoodDelay

tLowtohigh(Note4)200µs

PG_R

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SQ27692

ParameterSymbolTestConditionsMinTypMaxUnit

PowerGoodOutputLowVPG,LIPG=2mA0.060.10.18V

PGHighLeakageCurrent1µA

TopFETCurrentLimitI2.53.54.7A

LMT,RNG

OutputUnderVoltage

V(Note4)455055%V

ProtectionThresholdUVPREF

OutputUVPDelayt(Note4)10µs

UVP,DLY

UVPHic-cupONTimet(Note4)2ms

UVP,ON

UVPHic-cupOFFTimet(Note4)16ms

UVP,OFF

ThermalShutdown

T(Note4)150˚C

TemperatureSD

ThermalShutdownHysteresisT(Note4)15˚C

HYS

Note1:Stressesbeyond“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearefor

stressratings.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedinthe

operationalsectionsofthespecificationsisnotimplied.Exposuretoabsolutemaximumratingconditionsmayaffect

devicereliability.

Note2:θJAismeasuredinthenaturalconvectionatTA=25°Conatwo-layerSilergydemoboard.

Note3:Thedeviceisnotguaranteedtofunctionoutsideitsoperatingconditions.

Note4:Guaranteedbydesign.

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SQ27692

TypicalPerformanceCharacteristics

(fSW=500kHz,TA=25°C)

Efficiencyvs.OutputCurrentEfficiencyvs.OutputCurrent

(IOUT=0~2A,fsw=500kHz，L=10µH/PCMB104T-100MS)(IOUT=0~2A,fsw=500kHz，L=22µH/PCMB104T-220MS)

100100

95

90

90

80

(%)

(%)85

7080

75

EfficiencyEfficiency

EfficiencyEfficiency60

VIN=7V,VOUT=5V

70VIN=15V,VOUT=12V

VIN=12V,VOUT=5V

VIN=24V,VOUT=12V

50VIN=24V,VOUT=5V

VIN=48V,VOUT=12V

VIN=48V,VOUT=5V65

4060

0.0010.010.1120.0010.010.112

OutputCurrent(A)OutputCurrent(A)

LoadRegulationLoadRegulation

5.07012.180

12.170V=15V,V=12V

VIN=7V,VOUT=5VINOUT

5.060V=24V,V=12V

VIN=12V,VOUT=5V12.160INOUT

)

)V=48V,V=12V

VIN=24V,VOUT=5VINOUT

V

V

(

(12.150

VIN=48V,VOUT=5V

e

5.050e

g

g

a12.140

a

t

t

l

l

o

5.040o12.130

V

V

t

t

u

u12.120

p

p

t

t

u

5.030u

12.110

O

O

12.100

5.020

12.090

5.01012.080

00.20.40.60.81.01.21.41.61.8200.20.40.60.81.01.21.41.61.82

OutputCurrent(A)OutputCurrent(A)

OutputRippleOutputRipple

(VIN=24V,VOUT=5V,IOUT=0A)(VIN=24V,VOUT=5V,IOUT=2A)

∆VOUT50mV/div

∆VOUT50mV/div

VLX20V/div

VLX20V/div

IL2A/div

IL1A/div

Time(20ms/div)Time(2µs/div)

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SQ27692

StartupfromVINShutdownfromVIN

(VIN=24V,VOUT=5V,IOUT=0A)(VIN=24V,VOUT=5V,IOUT=0A)

VIN20V/div