DESCRIPTION

The LX1675 is a highly integrated power supply controller IC featuring three voltage mode PWM switching regulator stages with an additional onboard linear regulator driver.

Two of the constant frequency PWM phases can be easily configured for a single Bi-Phase high current output or operated as two independently regulated outputs. All outputs (PWM phases and LDO) have separate, programmable softstart sequencing. 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

◾ Four Independently Regulated Outputs

◾ Single Input Supply with Wide Voltage Range: 4.5-24V

◾ Outputs As Low As 0.8V Generated From a Precision Internal Reference

◾ Selectable PWM Frequency of 300KHz or 600KHz

◾ Buffered Reference Voltage Output

◾ Multiphase Output Reduces Need for Large Input Capacitance at High Currents

◾ Integrated High Current MOSFET Drivers

◾ Independent Soft-Start and Power Sequencing

◾ Adjustable Linear Regulator Driver Output

◾ No Current-Sense Resistors

◾ DDR Termination Compliant

◾ RoHS Compliant for Pb Free

APPLICATIONS

◾ Multi-Output Power Supplies

◾ Video Card Power Supplies

◾ PC Peripherals

◾ Portable PC Processor and I/O Supply