參數(shù)資料
型號: NCP1501DMR2G
廠商: ON Semiconductor
文件頁數(shù): 5/14頁
文件大小: 359K
描述: IC REG SGL BUCK/LINEAR 8MICRO
產(chǎn)品變化通告: Product Obsolescence 01/Jul/2009
標準包裝: 1
拓撲: 降壓(降壓)(1),線性(LDO)(1)
功能: 任何功能
輸出數(shù): 1
頻率 - 開關(guān): 500kHz ~ 1MHz
電壓/電流 - 輸出 1: 1.05V,1.35V,1.57V,1.8V,-
帶 LED 驅(qū)動器:
帶監(jiān)控器:
帶序列發(fā)生器:
電源電壓: 2.7 V ~ 5.2 V
工作溫度: -30°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應商設備封裝: Micro8?
包裝: 剪切帶 (CT)
其它名稱: NCP1501DMR2GOSCT
NCP1501
http://onsemi.com
5
DETAILEDOPERATINGDESCRIPTION
The Buck regulator is a synchronous rectifier PWM
regulatorwithintegratedMOSFETs.Thisregulatorhasan
LDOfunctionforlowpowermodestoconservepowerand
lower ripple voltage associated with PFM mode. The
NCP1501 does not containan internaloscillator for the
switchingmode.TheDualPWM/LDOmodeisanexclusive
PatentPendingcircuit.
ThePWMclockisgeneratedviaanexternalclocksignal
ontheSynchronizationpin.Theoperatingfrequencyrange
forthePWMis500kHzto1000kHz.Theoutputcurrentof
the PWMistypically100mAwitha guarantee ofover
300mAforthe2.7to5.2inputvoltagerange.
Ifasynchronizationpulseisnotpresent,theNCP1501
changesintotheLDOmode.TheLDOfunctionassuresthe
userofanextremelylowoutputripplevoltageandgreatly
reducedquiescentcurrentwhentheuserssystemisinasleep
mode.InternallytotheNCP1501,theSynchronizationpin
hasapulldownresistortoforcethepartintoLDOmode
whenaclocksignalisnotpresent.ToplacetheNCP1501in
LDOmode,theusermustsettheSynchronizationpinlow.
TheLDOmodeguaranteesanoutputinexcessof50mA.
PinsCB0andCB1controltheoutputvoltageselection.
Thefourvoltagesare1.05V,1.35V,1.57V,1.8V.CB0
containsapulldownresistorandCB1containsapullup
resistorinternaltotheNCP1501.Theresistorsforcethe
outputoftheconverterto1.35Vifthepinsarefloating
connectionstotheexternalcircuit.
TheShutdownPinenablestheoperationofthedevice.
TheShutdownPinhasaninternalpulldownresistortoforce
theNCP1501intotheoffmodeifthispinisfloatingdueto
theexternalcircuit.DuringStartup,theNCP1501hasasoft
startfunctiontolimitfastdV/dtandeliminateovershooton
theoutput.
Figure3.BlockDiagramandCircuitSchematicoftheNCP1501
L1
V
bat
Sync
SHD
C
in
10m
DC/DC
CONTROL
LDO
CONTROL
Q2
EA
CB0
CB1
10mH
LX
FB
V
out
C
out
10m
I
lim
Q1
Q3
Theexternalcomponentsrequiredareaninputandan
output100mFceramiccapacitoranda10mHinductor.
PWMMode
Duringnormaloperation,asynchronizationpulseactsas
theclockfortheDC/DCcontroller.Therisingedgeofthe
clockpullsthegateofQ1lowallowingthe inductorto
charge.WhenthecurrentthroughQ1reacheseitherthe
currentlimitorfeedbackvoltagereachesitslimit,Q1will
turnoffandQ2willturnon.Q2replacesthefreewheeling
diodetypicallyassociatedwithBuckConverters.Q2will
turnoffwheneitherarisingedgesyncpulseispresentorall
thestoredenergyisdepletedfromtheinductor.Q3remains
offduringthismode.
TheoutputvoltageaccuracyinthePWMmodeiswell
within 3% of the nominal set value. An over voltage
protectioncircuitispresentinthePWMmodetolimitthe
positivevoltagespikeduetofastloadtransientconditions.
ThePWMalsohastheabilitytogoto100%dutycyclefor
transient conditions and low input to output voltage
differentials.
InPWMmode,eachswitchingcyclehasaguaranteed
on--timeof100ns.TheNCP1501hastwoprotectioncircuits
thatcaneliminatethecycle.Whentripped,theovervoltage
protectionorthethermalshutdownoverridesthegatedrive
ofthehighsideMOSFET.
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