- 1 -`

AUGUST08,2012|DATASHEET| Rev3.1

IR3894

12AHighlyIntegratedSupIRBuck

Single‐InputVoltage,SynchronousBuckRegulator

PD‐97745

FEATURES

 Single5Vto21Vapplication

 WideInputVoltageRangefrom1.0Vto21Vwith

externalVcc

 OutputVoltageRange:0.5Vto0.86*Vin

 EnhancedLine/LoadRegulationwithFeed‐Forward

 ProgrammableSwitchingFrequencyupto1.5MHz

 InternalDigitalSoft‐Start/Soft‐Stop

 Enableinputwith

VoltageMonitoringCapability

 ThermallyCompensatedCurrentLimitwithrobust

hiccupmodeovercurrentprotection

 SmartinternalLDOtoimprovelightloadandfullload

efficiency

 ExternalSynchronizationwithSmoothClocking



 EnhancedPre‐BiasStart‐Up

 PrecisionReferenceVoltage(0.5V+/‐0.5%)with

marginingcapability

 VpforTrackingApplications((Source/SinkCapability

+/‐12A)

 IntegratedMOSFETdriversandBootstrapDiode

 ThermalShutDown

 ProgrammablePowerGoodOutputwithtracking

capability

 MonotonicStart‐Up

 Operatingtemp:‐

C<Tj<125

C

 SmallSize:5mmx6mmPQFN

 Lead‐free,Halogen‐freeandRoHSCompliant

BASICAPPLICATION

Figure1:IR3894BasicApplicationCircuit

DESCRIPTION

TheIR3894SupIRBuck

TM

isaneasy‐to‐use,fully

integratedandhighlyefficientDC/DCregulator.

TheonboardPWMcontrollerandMOSFETsmake

IR3894aspace‐efficientsolution,providingaccurate

powerdelivery.

IR3894isaversatileregulatorwhichoffers

programmableswitchingfrequencyandthefixed

internalcurrentlimit

Theswitchingfrequencyisprogrammablefrom300

kHz

to1.5MHzforanoptimumsolution.

Italsofeaturesimportantprotectionfunctions,suchas

Pre‐Biasstartup,thermallycompensatedcurrentlimit

overvoltageprotectionandthermalshutdowntogive

requiredsystemlevelsecurityintheeventoffault

conditions.

APPLICATIONS

 NetcomApplications

 EmbeddedTelecomSystems

 ServerApplications

 StorageApplications

 DistributedPointofLoadPowerArchitectures



Figure2:IR3894Efficiency

- 2 -`

AUGUST08,2012|DATASHEET| Rev3.1

IR3894

12AHighlyIntegratedSupIRBuck

Single‐InputVoltage,SynchronousBuckRegulator

PD‐97745



ORDERINGINFORMATION

IR3894―





Package Tape&ReelQty PartNumber

M 750 IR3894MTR1PBF

M 4000 IR3894MTRPBF

PINDIAGRAM

5mx6mmPOWERQFN

(TOPVIEW)



PBF–LeadFree

TR/TP1–TapeandReel

M–PackageType

Fb Vref Comp Gnd Rt/SyncS_Ctrl PGood

30 /

JPCB









- 3 -`

AUGUST08,2012|DATASHEET| Rev3.1

IR3894

12AHighlyIntegratedSupIRBuck

Single‐InputVoltage,SynchronousBuckRegulator

PD‐97745

BLOCKDIAGRAM



Figure3:IR3894SimplifiedBlockDiagram



Part #	ERJ-3EKF1000V
Description	RES THKFLM 0603 100 OHM 1% 1/10W 100PPM/ C SMD - Cut TR (S
Category	CHIP RESISTOR
Availability	Out of Stock
Qty	0

ERJ-3EKF1000V

Related Items

Technical Document