General Description
The FAN5026 PWM controller provides high efficiency and regulation for two output voltages adjustable in the range from 0.9V to 5.5V that are required to power I/O, chip-sets, and memory banks in high-performance computers, set top boxes, and VGA cards. Synchronous rectification contributes to high efficiency over a wide range of loads. Efficiency is even further enhanced by using MOSFET’s RDS(ON) as a current sense component.

Features
■ Highly flexible dual synchronous switching PWM controller includes modes for:
    – DDR mode with in-phase operation for reduced channel interference
    – 90° phase shifted two-stage DDR Mode for reduced input ripple
    – Dual Independent regulators 180° phase shifted
■ Complete DDR Memory power solution
    – VTT Tracks VDDQ/2
    – VDDQ/2 Buffered Reference Output
■ Lossless current sensing on low-side MOSFET or Precision current sensing using sense resistor
■ VCC Under-voltage Lockout
■ Wide power input range: 3 to 16V
■ Excellent dynamic response with Voltage Feed-Forward and Average Current Mode control
■ Power-Good Signal
■ Supports DDR-II and HSTL
■ TSSOP28 package

Applications
■ DDR VDDQ and VTT voltage generation
■ Desktop computer
■ Graphics cards