Infineon Technologies IR3891

Description

The IR3891 SupIRBuck® 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.

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: -40oC<Tj<125oC
• • Small Size 5mm x 6mm PQFN
• • Lead-free, Halogen-free, and RoHS Compliant

Typical applications

• Set Top Box Applications
• Embedded telecom Systems
• Netcom Applications
• Computing Peripheral Voltage regulators
• Sever Applications
• Distributed Point of Load Power Architectures
• Storage Applications
• General DC-DC Converters

More information

• Datasheet
• IC product information