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TS51221 Datasheet(PDF) 8 Page - Semtech Corporation

Part # TS51221
Description  High Efficiency Regulator IC for Wireless Power Receiver Applications
PDF  18 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

TS51221 Datasheet(HTML) 8 Page - Semtech Corporation

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TS51221
Final Datasheet
Rev 1.1
April 6, 2015
www.semtech.com
8 of 18
Semtech
VCC Under-Voltage Lockout
ThedeviceisheldintheoffstateuntilVCCreaches4.5V
(typical).Thereisa500mVhysteresisonthisinput,which
requirestheinputtofallbelow4.0V(typical)beforethedevice
willdisable.
Internal Protection Details
Internal Current Limit
ThecurrentthroughthehighsideFETissensedonacycle
bycyclebasisandifcurrentlimitisreached,itwillabbreviate
thecycle.Inaddition,thedevicesensestheFBpintoidentify
hardshortconditionsandwilldirecttheVSWoutputtoskip4
cyclesifcurrentlimitoccurswhenFBislow.Thisallowscurrent
builtupintheinductorduringtheminimumontimetodecay
sufficiently.Currentlimitisalwaysactivewhentheregulator
isenabled.Softstartensurescurrentlimitdoesnotprevent
regulatorstartup.
Underextendedovercurrentconditions(suchasashort),
thedevicewillautomaticallydisable.Oncetheovercurrent
conditionisremoved,thedevicereturnstonormaloperation
automatically.(Alternatelythefactorycanconfigurethe
device’sNVMtoshutdowntheregulatorifanextendedover
currenteventisdetectedandrequireatoggleoftheEnable
pintoreturnthedevicetonormaloperation.)
Thermal Shutdown
Ifthetemperatureofthedieexceeds170°C(typical),theVSW
outputswilltri-statetoprotectthedevicefromdamage.The
PGandallotherprotectioncircuitrywillstayactivetoinform
thesystemofthefailuremode.Oncethedevicecoolsto160°C
(typical),thedevicewillstartupagain,followingthenormal
softstartsequence.Ifthedevicereaches170°C,theshutdown/
restartsequencewillrepeat.
Reference Soft Start
Thereferenceinthisdeviceisrampedatarateof4msto
preventtheoutputfromovershootduringstartup.Thisramp
restartswheneverthereisarisingedgesensedontheEnable
pin.Thisoccursinboththefixedandadjustableversions.
Duringthesoftstartramp,currentlimitisstillactive,andwill
stillprotectthedeviceincaseofashortontheoutput.
Output Overvoltage
Iftheoutputoftheregulatorexceeds103%oftheregulation
voltage,theVSWoutputswilltri-statetoprotectthedevice
fromdamage.Thischeckoccursatthestartofeachswitching
cycle.Ifitoccursduringthemiddleofacycle,theswitching
forthatcyclewillcomplete,andtheVSWoutputswilltri-state
atthebeginningofthenextcycle.



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