IR3891 Datasheet, PDF (1/47 Pages) International Rectifier – Dual output, 4A/Phase, Highly Integrated SupIRBuck

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^oC<Tj<125^oC
 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, 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
 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
Form
Quantity
Tape and Reel
750
Tape and Reel
4000
Orderable Part
Number
IR3891MTR1PBF
IR3891MTRPBF
1
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May 08, 2013