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IR3535 Datasheet(PDF) 1 Page - International Rectifier

Part # IR3535
Description  Synchronous Buck Converter Driver Over temperature reporting
PDF  17 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3535 Datasheet(HTML) 1 Page - International Rectifier

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March 13, 2013   |  FINAL DATASHEET
1
IR3535 
Synchronous Buck Converter Driver 
FEATURES 
• 5V to 7V gate drivers with 6A GATEL sink current 
and 4A GATEH sink current  
• 4.5V to 14V VIN range 
• Local lossless inductor current sensing with 
improved noise immunity and accuracy  
• Single reference based current reporting output 
• Integrated bootstrap synchronous PFET 
• Tri‐state PWM diode emulation mode for optimal 
light load efficiency 
• 7V tolerant PWM input compatible with 3.3V logic 
• MOSFET monitoring with PHSFLT output 
• Over temperature reporting 
• Only four external components per phase 
• Self‐calibration of current sense amplifier input 
offset to maximize accuracy 
• Body‐Braking™ feature with active low logic 
• RoHS compliant , small thermally enhanced  
16L 3 X 3mm MLPQ package  
APPLICATIONS 
• Server, notebook and desktop computers 
• Game consoles 
• Consumer electronics – STB, LCD, TV, printers 
• General purpose POL DC‐DC converters 
BASIC APPLICATION 
SW
PWM
VIN
PGND
VCC
VCC
BOOST
VIN
VOUT
PWM
CSIN+
CSIN‐
4.5V to 7V
LGND
IOUT
IOUT
BBRK#
BBRK#
REFIN
REFIN
4.5V to 14V
IR3535
PHSFLT#
PHSFLT#
GATEL
GATEH
PVCC
TGND
 
Figure 1: IR3535 Basic Application Circuit 
DESCRIPTION 
The  IR3535  is  a  high  performance,  floating  N‐channel 
MOSFET  driver  that  is  optimized  for  maximum  efficiency 
delivery  of  a  synchronous  buck  converter.  It  is  a  “Smart” 
driver  that  continually  monitors  MOSFET  conditions, 
contains  self‐calibrating  inductor  current  sense  amplifier, 
and provides diode emulation mode with local zero current 
detection.  
The  integrated  current  sense  amplifier  achieves  superior 
current  sense  accuracy  vs.  best‐in‐class  controller  based 
inductor DCR sense methods while delivering the clean and 
accurate current report information. 
The  IR  patented  Body‐Braking
™  feature  reduces  inductor 
to  output  capacitor  energy  transfer  during  load  release 
which allows the output capacitor bank to be reduced.   
Diode  emulation  mode  in  the  IR3535  alleviates  the  zero‐
current  detection  and  control  burden  from  the  PWM 
controller and increases system light load efficiency.  
The IR3535 monitors MOSFET conditions and temperature 
and reports phase fault if MOSFET short, MOSFET open or 
over temperature is detected.     
Up to 1.0MHz switching frequency capability enables high 
performance transient response, miniaturization of output 
inductors,  as  well  as  reduced  input  and  output  capacitors 
while  maintaining  industry  leading  efficiency.   Solution 
size,  thermal  performance  and  cost  can  be  optimized  by 
combining  with  IR’s  DirectFET
™  MOSFETs  and  utilizing  a 
dual sided layout. 
 
Figure 2: IR3535 Gate Driver Waveforms 
PWM 
5V/div
GATEH 
10V/div
GATEL 
5V/div 
100ns/div 


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