ERJ-3EKF3321V datasheet(1/43 Pages) IRF

Part #	ERJ-3EKF3321V

Description	12A HIGHLY INTERGRATED SUPLRBUCK

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Manufacturer	IRF [International Rectifier]

Direct Link	http://www.irf.com

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AUGUST 08, 2012 | DATA SHEET | Rev 3.1

1

IR3894

12A Highly Integrated SupIRBuck

Single‐Input Voltage, Synchronous Buck Regulator

PD‐97745

FEATURES

 Single 5V to 21V application

 Wide Input Voltage Range from 1.0V to 21V with

external Vcc

 Output Voltage Range: 0.5V to 0.86* Vin

 Enhanced Line/Load Regulation with Feed‐Forward

 Programmable Switching Frequency up to 1.5MHz

 Internal Digital Soft‐Start/Soft‐Stop

 Enable input with Voltage Monitoring Capability

 Thermally Compensated Current Limit with robust

hiccup mode over current protection

 Smart internal LDO to improve light load and full load

efficiency

 External Synchronization with Smooth Clocking

 Enhanced Pre‐Bias Start‐Up

 Precision Reference Voltage (0.5V+/‐0.5%) with

margining capability

 Vp for Tracking Applications ((Source/Sink Capability

+/‐12A)

 Integrated MOSFET drivers and Bootstrap Diode

 Thermal Shut Down

 Programmable Power Good Output with tracking

capability

 Monotonic Start‐Up

 Operating temp: ‐40oC < Tj < 125oC

 Small Size: 5mm x 6mm PQFN

 Lead‐free, Halogen‐free and RoHS Compliant

BASIC APPLICATION

Figure 1: IR3894 Basic Application Circuit

DESCRIPTION

The IR3894 SupIRBuck

TM is an easy‐to‐use, fully

integrated and highly efficient DC/DC regulator.

The onboard PWM controller and MOSFETs make

IR3894 a space‐efficient solution, providing accurate

power delivery.

IR3894 is a versatile regulator which offers

programmable switching frequency and the fixed

internal current limit

The switching frequency is programmable from 300 kHz

to 1.5MHz for an optimum solution.

It also features important protection functions, such as

Pre‐Bias startup, thermally compensated current limit

over voltage protection and thermal shutdown to give

required system level security in the event of fault

conditions.

APPLICATIONS

 Netcom Applications

 Embedded Telecom Systems

 Server Applications

 Storage Applications

 Distributed Point of Load Power Architectures

Figure 2: IR3894 Efficiency

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ERJ-3EKF3321V Datasheet(PDF) 1 Page - International Rectifier

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