FAN5026

FAN5026 — Dual DDR / Dual-Output PWM Controller March 2011 FAN5026 Dual DDR / Dual-Output PWM Controller Features Highly Flexible, Dual Synchronous Switching PWM Controller that 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 Over-Current Using Sense Resistor VCC Under-Voltage Lockout Wide Input Range: 3V to 16V Excellent Dynamic Response with Voltage Feedforward and Average Current-Mode Control Power-Good Signal Supports DDR-II and HSTL 28-Lead Thin-Shrink Small-Outline Package Applications DDR VDDQ and VTT Voltage Generation PC Dual Power Supply Server DDR Power Desktop Computer Graphics Cards Description The FAN5026 PWM controller provides high efficiency and regulation for two output voltages adjustable in the range of 0.9V to 5.5V required to power I/O, chip-sets, and memory banks in high-performance computers, set-top boxes, and VGA cards. Synchronous rectification and hysteretic operation at light loads contribute to high efficiency over a wide range of loads. Efficiency is enhanced by using MOSFET RDS(ON) as a current-sense component. Feedforward ramp modulation, average-current mode control, and internal feedback compensation provide fast response to load transients....