Microchip LX7165 Handleiding

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Copyright © 2016 Microsemi Page1

Rev. 1.2, 09/192016 Analog Mixed Signal Group

One Enterprise Aliso Viejo, CA 92656 USA, 1-800-713-4113, 949-380-6100, fax 949-215-4996

LX7165

3Vto5.5V,5AConstantFrequencyHysteretic

SynchronousBuckRegulatorwithI

2

C

ProductionDatasheet



Description



TheLX7165isadigitallycontrolledstep‐downregulator

ICwithanintegrated40mΩhigh‐sideP‐channel

MOSFETanda14mΩlow‐sideN‐channelMOSFET.It

featuresMicrosemi’sproprietaryconstant‐frequency

hystereticcontrolenginefornear‐instantaneous

correctiontoline/loadtransients.Itdoesnotrequire

high‐ESRoutputcapacitorsandincorporatesenergy‐

saving“PSM”(PowerSaveorPulseSkipMode)atlight

loads,toextendbatterylifeinmobileapplications.

TheLX7165hasanI

2

Cserialinterfaceportforoutput

voltagemarginingandmonitoringifrequired(itcan

alsooperateindefaultmode).Inadditionitincludes

robustfaultmonitoringfunctions.

TheLX7165willoperatefrom3Vto5.5V,andisreadily

availablein4fixedoutputvoltageoptions:0.8,0.9V,

0.95V,and0.97V(novoltagedividerisnecessary).After

startup,thereferencevoltagecanbeadjustedwithI2C

witharesolution4.7mVbetween0.6Vand1.2V.The

outputvoltagecanalsobeadjustedwithanexternal

voltagedividerupto3.3V.



Features



ConstantFrequencyHystereticControl

ExtremelyFastLine/LoadTransientResponse

I

2

CforOutputAdjustment(3.4Mbps)

1.875MHzSwitchingFrequency

ExtremelyLow‐R

DSON

MOSFETS

InputVoltageRail3.3Vto5V

Greaterthan5AOutputCurrent

I

2

CSelectablePowerSaveModeforLight‐Load

Efficiency

UVLO,OVP,OCP

0°Cto+85°CAmbientTemperature

AvailableinWLCSP‐20(0.4mmpitch)

RoHSCompliant



Applications

HighPerformanceHDD

Notebooks/Netbooks/Tablets/Slates

Figure 1: Typical 5V to 1.8V at 5A schematic with or without I

2

C implemented

Product specificaties