Synchronous Buck Converter Driver
FEATURES
IR3535
DESCRIPTION
5V to 7V gate drivers with 6A GATEL sink current
and 4A GATEH sink current
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.
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
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.
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
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.
Over temperature reporting
Only four external components per phase
Self‐calibration of current sense amplifier input
offset to maximize accuracy
Diode emulation mode in the IR3535 alleviates the zero‐
current detection and control burden from the PWM
controller and increases system light load efficiency.
Body‐Braking™ feature with active low logic
RoHS compliant , small thermally enhanced
16L 3 X 3mm MLPQ package
The IR3535 monitors MOSFET conditions and temperature
and reports phase fault if MOSFET short, MOSFET open or
over temperature is detected.
APPLICATIONS
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.
Server, notebook and desktop computers
Game consoles
Consumer electronics – STB, LCD, TV, printers
General purpose POL DC‐DC converters
BASIC APPLICATION
PWM
5V/div
VCC
VCC
4.5V to 7V
BOOST
PVCC
VIN
IR3535
PHSFLT#
PHSFLT#
PWM
PWM
BBRK#
BBRK#
REFIN
REFIN
IOUT
IOUT
LGND
PGND
VIN
4.5V to 14V
GATEH
SW
GATEH
10V/div
VOUT
GATEL
GATEL
5V/div
CSIN+
CSIN‐
Figure 1: IR3535 Basic Application Circuit
1
April 30, 2012 | FINAL DATASHEET
100ns/div
Figure 2: IR3535 Gate Driver Waveforms
Synchronous Buck Converter Driver
ORDERING INFORMATION
Package
Tape & Reel Qty
Part Number
16 Lead MLPQ
(3 x 3 mm body)
3000
IR3535MTRPBF
VIN
BOOST
PVCC
PHSFLT#
CSIN+
VCC
PWM
CSIN‐
PIN DIAGRAM
Figure 3: IR3535 Pin Diagram (Top View)
2
April 30, 2012 | FINAL DATASHEET
IR3535
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