DESCRIPTION

The LX1671 is a highly integrated power supply controller IC featuring three PWM switching regulator stages with an additional onboard linear regulator driver.

Two of the constant frequency voltage-mode PWM phases can be easily configured for a single Bi-Phase high current output or two independently regulated outputs. Each phase incorporates a fully programmable soft-start sequence. This versatility yields either three or four independently regulated outputs with full power sequencing capability giving system designers the ultimate flexibility in power supply design.

KEY FEATURES

◾ Up to Four Independently Regulated Outputs

◾ Outputs As Low As 0.8V Generated From An Internal 1 Reference

◾ Multiphase High Current Output Reduces Required Capacitance

◾ Integrated High Current MOSFET Drivers

◾ 300kHz High Frequency Operation Minimizes External Component Requirements

◾ Independent Phase Programmable Soft-Start and Power Sequencing

◾ Adjustable Linear Regulator Driver Output

◾ No current-sense resistors

◾ DDR Termination Compliant

APPLICATIONS/BENEFITS

◾ Multi-Output Power Supplies

◾ Video Card Power Supplies

◾ PC Peripherals

◾ Portable PC Processor and I/O Supply