SynchronousBuckConverterDriver
IR3535
FEATURES DESCRIPTION
5Vto7Vgatedriverswith6AGATELsinkcurrent
The IR3535 is a high performance, floating Nchannel
and4AGATEHsinkcurrent
MOSFETdriverthatisoptimizedformaximumefficiency
deliveryofasynchronousbuckconverter.ItisaSmart
4.5Vto14VVINrange
driver that continually monitors MOSFET conditions,
Locallosslessinductorcurrentsensingwith
containsselfcalibratinginductorcurrentsenseamplifier,
improvednoiseimmunityandaccuracy
andprovidesdiodeemulationmodewithlocalzerocurrent
Singlereferencebasedcurrentreportingoutput detection.
IntegratedbootstrapsynchronousPFET
Theintegratedcurrentsenseamplifierachievessuperior
TristatePWMdiodeemulationmodeforoptimal
currentsenseaccuracyvs.bestinclasscontrollerbased
lightloadefficiency
inductorDCRsensemethodswhiledeliveringthecleanand
accuratecurrentreportinformation.
7VtolerantPWMinputcompatiblewith3.3Vlogic
MOSFETmonitoringwithPHSFLToutput
TheIRpatentedBodyBrakingfeaturereducesinductor
Overtemperaturereporting to output capacitor energy transfer during load release
whichallowstheoutputcapacitorbanktobereduced.
Onlyfourexternalcomponentsperphase
Selfcalibrationofcurrentsenseamplifierinput
DiodeemulationmodeintheIR3535alleviatesthezero
offsettomaximizeaccuracy
current detection and control burden from the PWM
controllerandincreasessystemlightloadefficiency.
BodyBrakingfeaturewithactivelowlogic
RoHScompliant,smallthermallyenhanced
TheIR3535monitorsMOSFETconditionsandtemperature
16L3X3mmMLPQpackage
andreportsphasefaultifMOSFETshort,MOSFETopenor
overtemperatureisdetected.
APPLICATIONS
Upto1.0MHzswitchingfrequencycapabilityenableshigh
Server,notebookanddesktopcomputers
performancetransientresponse,miniaturizationofoutput
inductors,aswellasreducedinputandoutputcapacitors
Gameconsoles
while maintaining industry leading efficiency. Solution
ConsumerelectronicsSTB,LCD,TV,printers
size,thermalperformanceandcostcanbeoptimizedby
combiningwithIRsDirectFETMOSFETsandutilizinga
GeneralpurposePOLDCDCconverters
dualsidedlayout.
BASICAPPLICATION
PWM
5V/div
VCC BOOST
VCC
4.5Vto7V
PVCC VIN
VIN
4.5Vto14V
IR3535
PHSFLT# PHSFLT#
GATEH
GATEH
VOUT
PWM
PWM
10V/div
SW
BBRK# BBRK#
REFIN REFIN
GATEL
IOUT IOUT
GATEL
LGND
CSIN+
5V/div
PGND
CSIN
100ns/div
Figure1:IR3535BasicApplicationCircuit
Figure2:IR3535GateDriverWaveforms
1 April30,2012 |FINALDATASHEETSynchronousBuckConverterDriver
IR3535
ORDERINGINFORMATION
Package Tape&ReelQty PartNumber
16LeadMLPQ
3000 IR3535MTRPBF
(3x3mmbody)
PINDIAGRAM
Figure3:IR3535PinDiagram(TopView)
2 April30,2012 |FINALDATASHEET
CSIN
PWM
CSIN+ PHSFLT#
VCC
VIN
PVCC BOOST