Description

The FAN5093 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.
The FAN5093 features Programmable Active Droop™ for transient response with minimum output capacitance. It has integrated high-current gate drivers, with adaptive delay gate switching, eliminating the need for external drive devices. The FAN5093 uses a 5-bit D/A converter to program the output voltage from 1.10V to 1.85V in 25mV steps with an accuracy of 1%. The FAN5093 uses a high level of integration to deliver load currents in excess of 50A from a 12V source with minimal external circuitry.
The FAN5093 also offers integrated functions including Power Good, Output Enable/Soft Start, under-voltage lockout, over-voltage protection, and adjustable current limiting with independent current sense on each phase. It is available in a 24 pin TSSOP package.

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
1MHz 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
• High efficiency mode (E*) at light load
• 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