Description

The FAN5090 is a synchronous two-phase DC-DC controller IC which provides a highly accurate, programmable output voltage for VRM 9.x processors. Two interleaved synchronous buck regulator phases with built-in current sharing operate 180° out of phase to provide the fast transient response needed to satisfy high current applications while minimizing external components.

Features

• Programmable output from 1.10V to 1.85V in 25mV steps using an integrated 5-bit DAC

• Two interleaved synchronous phases for maximum performance

• 100nsec transient response time

• Built-in current sharing between phases

• Remote sense

• Programmable Active Droop (Voltage Positioning)

• Programmable switching frequency from 100KHz to 300KHz per phase

• Adaptive delay gate switching

• Integrated high-current gate drivers

• Integrated Power Good, OV, UV, Enable/Soft Start functions

• Drives N-channel MOSFETs

• Operation optimized for 12V operation

• Overcurrent protection using MOSFET sensing

• 24 pin TSSOP package

Applications

• Power supply for Pentium® IV

• Power supply for Athlon®

• VRM for Pentium IV processor

• Programmable step-down power supply