IR3447 Datasheet, PDF (1/51 Pages) International Rectifier – 25A Highly Integrated SupIRBuck Single-Input Voltage, Synchronous Buck Regulator

25A Highly Integrated SupIRBuck^TM
Single-Input Voltage, Synchronous Buck Regulator
IR3447
FEATURES
 Single 5V to 21V application
 Wide Input Voltage Range from 1.5V to 21V with
external Vcc
 Output Voltage Range: 0.6V to 0.86*PVin
 0.5% accurate Reference Voltage
 Enhanced line/load regulation with Feed-Forward
 Programmable Switching Frequency up to 1.5MHz
 Internal Digital Soft-Start
 Enable input with Voltage Monitoring Capability
 Remote Sense Amplifier with True Differential
Voltage Sensing
 Thermally compensated current limit and Hiccup
Mode Over Current Protection
 Smart LDO to enhance efficiency
 External synchronization with Smooth Clocking
 Dedicated output voltage sensing for power good
indication and overvoltage protection which
remains active even when Enable is low.
 Enhanced Pre-Bias Start up
 Body Braking to improve transient
 Integrated MOSFET drivers and Bootstrap diode
 Thermal Shut Down
 Post Package trimmed rising edge dead-time
 Programmable Power Good Output
 Small Size 5mm x 6mm PQFN
 Operating Junction Temp: -40^oC<Tj<125^oC
 Lead-free, Halogen-free and RoHS Compliant
DESCRIPTION
The IR3447 SupIRBuck^TM is an easy-to-use, fully
integrated and highly efficient DC/DC regulator. The
onboard PWM controller and MOSFETs make IR3447
a space-efficient solution, providing accurate power
delivery for low output voltage and high current
applications.
IR3447 is a versatile regulator which offers
programmability of switching frequency and current
limit while operating in wide input and output voltage
range.
The switching frequency is programmable from 300
kHz to 1.5MHz for an optimum solution.
It also features important protection functions, such as
Over Voltage Protection (OVP), Pre-Bias startup,
hiccup current limit and thermal shutdown to give
required system level security in the event of fault
conditions.
APPLICATIONS
 Server Application
 Distributed Point of Load Power Architectures
 Set Top Box Application
 Power Supplies
ORDERING INFORMATION
Base Part
Number
Package Type
IR3447
PQFN 5mm x 6mm
IR3447
PQFN 5mm x 6mm
Standard Pack
Form
Quantity
Tape and Reel
750
Tape and Reel
4000
Orderable Part
Number
IR3447MTR1PBF
IR3447MTRPBF
1
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July 17, 2013