參數(shù)資料
型號(hào)： LTC4099EUDC#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC20
封裝： 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20
文件頁(yè)數(shù)： 3/36頁(yè)
文件大?。?/td> 536K
代理商： LTC4099EUDC#TRPBF
LTC4099
4099fd
IRQ (Pin 8):Open-DrainInterruptOutput.TheIRQpin
canbeusedtogenerateaninterruptduetoamultitude
ofmaskablestatuschangeeventswithintheLTC4099.
SeeTable1.
GND (Pin 9, Exposed Pad Pin 21):Ground.TheExposed
PadandpinmustbesolderedtothePCBtoprovidealow
electricalandthermalimpedanceconnectiontoground.
IDGATE (Pin 10):IdealDiodeAmplifierOutput.Thispin
controlsthegateofanexternalP-channelMOSFETtran-
sistorusedtosupplementtheinternalidealdiode.The
sourceoftheP-channelMOSFETshouldbeconnectedto
VOUTandthedrainshouldbeconnectedtoBAT.
BAT (Pin 11):Single-CellLi-IonBatteryPin.Depending
onavailablepowerandload,aLi-IonbatteryonBATwill
either deliver system power to VOUTthroughtheideal
diodeorbechargedfromthebatterycharger.
VOUT (Pin 12):OutputVoltageoftheSwitchingPowerPath
ControllerandInputVoltageoftheBatteryCharger.The
majorityoftheportableproductshouldbepoweredfrom
VOUT.TheLTC4099willpartitiontheavailablepowerbe-
tweentheexternalloadonVOUTandtheinternalbattery
charger.Priorityisgiventotheexternalloadandanyextra
powerisusedtochargethebattery.Anidealdiodefrom
BATtoVOUTensuresthatVOUTispoweredeveniftheload
exceedstheallottedpowerfromVBUSoriftheVBUSpower
sourceisremoved.VOUTshouldbebypassedwithalow
impedancemultilayerceramiccapacitor.
VBUS (Pin 13): InputVoltagefortheSwitchingPowerPath
Controller.VBUSwillusuallybeconnectedtotheUSBport
ofacomputeroraDCoutputwalladapter.VBUSshould
be bypassed with a low impedance multilayer ceramic
capacitor.
SW (Pin 14):SwitchingRegulatorPowerTransmission
Pin.TheSWpindeliverspowerfromVBUStoVOUTviathe
step-downswitchingregulator.Aninductorshouldbecon-
nectedfromSWtoVOUT.SeetheApplicationsInformation
sectionforadiscussionofinductancevalue.
DVCC (Pin 15):LogicReferencefortheI2CSerialPort.A
0.01Fbypasscapacitorisrequired.
SCL (Pin 16):ClockInputfortheI2CSerialPort.TheI2C
inputlevelsarescaledwithrespecttoDVCC.
SDA (Pin 17):DataInput/OutputfortheI2CSerialPort.
TheI2CinputlevelsarescaledwithrespecttoDVCC.
ACPR (Pin 18):AuxiliaryPowerSourcePresentOutput
(ActiveLow).ACPRindicatesthattheoutputofanexternal
highvoltagestep-downswitchingregulatorconnectedto
WALLissuitableforusebytheLTC4099.ACPRmaybe
connectedtothegateofanexternalP-channelMOSFET
transistorwhosesourceisconnectedtoVOUTandwhose
drainisconnectedtoWALL.ACPRhasahighlevelofVOUT
andalowlevelofGND.
CLPROG(Pin19):USBCurrentLimitProgramandMonitor
Pin.A1%resistorfromCLPROGtogrounddetermines
theupperlimitofthecurrentdrawnfromtheVBUSpin.
Aprecisefractionoftheinputcurrent,hCLPROG,issent
totheCLPROGpinwhenthehighsideswitchison.The
switchingregulatordeliverspoweruntiltheCLPROGpin
reaches1.18V.Therefore,thecurrentdrawnfromVBUS
will be limited to an amount given by hCLPROG and
RCLPROG.ThereareamultitudeofratiosforhCLPROG
availablebyI2Ccontrol,twoofwhichcorrespondtothe
100mAand500mAUSBspecifications(seeTable2).A
multilayerceramicaveragingcapacitorisalsorequiredat
CLPROGforfiltering.
OVSENS (Pin 20):OvervoltageProtectionSenseInput.
OVSENSshouldbeconnectedthrougha6.2kresistorto
theinputpowerconnectorandthedrainofanexternal
N-channel MOSFET pass transistor. When the voltage
onthispinexceedsVOVCUTOFF,theOVGATEpinwillbe
pulledtoGNDtodisablethepasstransistorandprotect
theLTC4099frompotentiallydamaginghighvoltage.
pin FuncTions
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