IR3894M_15 Datasheet, PDF (1/45 Pages) International Rectifier – Single‐Input Voltage, Synchronous Buck Regulator

12A Highly Integrated SupIRBuck
Single‐Input Vo_{- 1}lta_-`ge, Synchronous Buck Regulator
PD‐97745
IR3894
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: ‐40^oC < Tj < 125^oC
 Small Size: 5mm x 6mm PQFN
 Lead‐free, Halogen‐free and RoHS Compliant
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
BASIC APPLICATION
Figure 1: IR3894 Basic Application Circuit
1 JANUARY 18, 2013 | DATA SHEET | Rev 3.4
Figure 2: IR3894 Efficiency