IR3535 Datasheet, PDF (1/17 Pages) International Rectifier – Synchronous Buck Converter Driver Over temperature reporting

Synchronous Buck Converter Driver _IR3535
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
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.
BASIC APPLICATION
VCC
4.5V to 7V
PHSFLT#
PWM
BBRK#
REFIN
IOUT
VCC
BOOST
PVCC
VIN
IR3535
PHSFLT#
PWM
GATEH
BBRK#
SW
REFIN
IOUT
GATEL
LGND
TGND
PGND
CSIN+
CSIN‐
VIN
4.5V to 14V
VOUT
Figure 1: IR3535 Basic Application Circuit
1 March 13, 2013 | FINAL DATASHEET
PWM
5V/div
GATEH
10V/div
GATEL
5V/div
100ns/div
Figure 2: IR3535 Gate Driver Waveforms