Single-Input Voltage, Synchronous Buck Regulator
25A Highly Integrated SupIRBuck
TM
IR3847
1 www.irf.com © 2013 International Rectifier May 20, 2013
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
Vp for tracking applications and sequencing
Vref is available externally to enable margining
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 with tracking
Small Size 5mm x 6mm PQFN
Operating Junction Temp: -40
o
C<Tj<125
o
C
Lead-free, Halogen-free and RoHS Compliant
DESCRIPTION
The IR3847 SupIRBuck
TM
is an easy-to-use, fully
integrated and highly efficient DC/DC regulator. The
onboard PWM controller and MOSFETs make IR3847
a space-efficient solution, providing accurate power
delivery for low output voltage and high current
applications.
IR3847 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
Netcom Applications
Embedded Telecom Systems
Server Application
Distributed Point of Load Power Architectures
Storage Applications
ORDERING INFORMATION
Base Part
Number
Package Type
Standard Pack Orderable Part
Number
Form Quantity
IR3847 PQFN 5mm x 6mm Tape and Reel 750 IR3847MTR1PBF
IR3847 PQFN 5mm x 6mm Tape and Reel 4000 IR3847MTRPBF
