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1、R5478N_E_20101214.doc/2010/12/14PRELIMINARYLi-ION/POLYMER1CELLPROTECTORR5478NxxxxSERIESOUTLINETheR5478NxxxxxSeriesarehighvoltageCMOS-basedprotectionICsforover-charge/dischargeofre-chargeableone-cellLithium-ion(Li+)/Lithiumpolymerexcessloadcurrent,furtherincludeashor
2、tcircuitprotectorforpreventinglargeexternalshortcircuitcurrentandExcesscharge/discharge-current.EachoftheseICsiscomposedofthreevoltagedetectors,areferenceunit,adelaycircuit,ashortcircuitprotector,anoscillator,acounter,andalogiccircuit.Whentheover-chargevoltagecrosse
3、sthedetectorthresholdfromalowvaluetoahighvalue,theoutputofCOUTpinswitchestolowlevelafterinternalfixeddelaytime.Theconditionstoreleaseover-chargedetectoraredifferentbymaskoptions.Intermsofsocalled“Latchfunction”version,afterdetectingover-charge,thedetectorcanbereseta
4、ndtheoutputofCOUTbecomes"H"whenakindofloadisconnectedtoVDDafterachargerisdisconnectedfromthebatterypack,andthecellvoltagebecomeslowerthanover-chargedetectorthreshold.Ifachargeriscontinuetobeconnectedtothebatterypack,eventhecellvoltagebecomeslowerthanover-chargedetec
5、torthreshold,over-chargestateisnotreleased.Ontheotherhand,intermsofsocalled,“Releasedbyvoltagelevel”version,afterdetectingover-charge,whenthecellvoltagereachesthereleasedvoltagefromover-charge,theoutputofCOUTbecomes“H”TheoutputofDOUTpin,theoutputofOver-dischargedete
6、ctorandExcessdischarge-currentdetector,switchesto“L”levelafterinternallyfixeddelaytime,whendischargedvoltagecrossesthedetectorthresholdfromahighvaluetoavaluelowerthanVDET2.Theconditionstoreleaseover-dischargedetectorarealsodifferentbymaskoptions.Intermsofsocalled“La
7、tchfunction”version,afterdetectingover-dischargevoltage,connectachargertothebatterypack,andwhenthebatterysupplyvoltagebecomeshigherthanover-dischargedetectorthreshold,VD2isreleasedandthevoltageofDOUTpinbecomes"H"level.Ontheotherhand,intermsofsocalled“Releasedbyvolta
8、gelevel”version,incasethatthechargerisnotconnected,whenthecellvoltagebecomesequalreleasedvoltagefromover-discharge,over-dischargedetectori
