DESCRIPTION
The IR3899 SupIRBuckTM is an easy‐to‐use, fully integrated and highly efficient DC/DC regulator. The onboard PWM controller and MOSFETs make IR3899 a space‐efficient solution, providing accurate power delivery.
IR3899 is a versatile regulator which offers programmable switching frequency and the fixed internal current limit while operates in wide input and output voltage range.

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 +/‐9A)
• 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: 4mm x 5mm PQFN
• Lead‐free, Halogen‐free and RoHS Compliant

APPLICATIONS
• Netcom Applications
• Embedded Telecom Systems
• Server Applications
• Storage Applications
• Distributed Point of Load Power Architectures