Dual output, 4A/Phase, Highly Integrated SupIRBuck
TM
Single-Input Voltage, Synchronous Buck Regulator
IR3891
FEATURES
Single 5V to 21V application
Wide Input Voltage Range from 1V to 21V with
external Vcc
Output Voltage Range: 0.5V to 0.86*PVin
Dual output, 4A/Phase
Enhanced Line/Load Regulation with Feed-
Forward
Programmable Switching Frequency up to 1.5MHz
Internal Digital Soft-Start
Enable input with Voltage Monitoring Capability
Thermally compensated current limit and Hiccup
Mode Over Current Protection
External synchronization with Smooth Clocking
Precision Reference Voltage (0.5V +/-1%)
Seq pin for Sequencing Applications
Integrated MOSFETs, drivers and Bootstrap diode
Thermal Shut Down
Open Feedback Line Protection
Over Voltage Protection
Interleaved Phases to reduce Input Capacitors
Monotonic Start-Up
Operating Junction Temp: -40
o
C<Tj<125
o
C
Small Size 5mm x 6mm PQFN
Lead-free, Halogen-free, and RoHS Compliant
DESCRIPTION
The IR3891 SupIRBuck
TM
is an easy-to-use, fully
integrated and highly efficient DC/DC regulator. The
onboard PWM controller and MOSFETs make IR3891
a space-efficient solution, providing accurate power
delivery for low output voltage.
IR3891 is a versatile regulator which offers
programmability of switching frequency and a fixed
current limit while operating in wide input and output
voltage range.
The switching frequency is programmable from
300kHz to 1.5MHz for an optimum solution.
It also features important protection functions,
Over Voltage Protection (OVP), Pre-Bias
hiccup current limit and thermal shutdown
required system level security in the event
conditions.
such as
startup,
to give
of fault
APPLICATIONS
Sever Applications
Netcom Applications
Set Top Box Applications
Storage Applications
Embedded telecom Systems
Distributed Point of Load Power Architectures
Computing Peripheral Voltage regulators
General DC-DC Converters
ORDERING INFORMATION
Base Part
Number
IR3891
IR3891
Package Type
PQFN 5mm x 6mm
PQFN 5mm x 6mm
Standard Pack
Orderable Part
Number
IR3891MTR1PBF
IR3891MTRPBF
750
4000
Form
Tape and Reel
Tape and Reel
Quantity
1
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© 2013 International Rectifier
May 08, 2013
IRF [ INTERNATIONAL RECTIFIER ]
