FAN5236

FAN5236 — Dual Mobile-Friendly DDR / Dual-Output PWM Controller FAN5236 Dual Mobile-Friendly DDR / Dual-Output PWM Controller Features  Highly Flexible, Dual Synchronous Sw itching PWM Controller that Includes Modes for: - DDR Mode w ith In-phase Operation for Reduced Channel Interference - 90° Phase-shifted, Tw o-stage DDR Mode for Reduced Input Ripple - Dual Independent Regulators, 180° Phase Shifted  Complete DDR Memory Pow er 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  Converters can Operate f rom +5V or 3.3V or Battery Pow er Input (5V to 24V)  Excellent Dynamic Response w ith Voltage Feedforw ard and Average-Current-Mode Control  Pow er-Good Signal  Supports DDR-II and HSTL  Light-Load Hysteretic Mode Maximizes Efficiency  TSSOP28 Package Applications  DDR VDDQ and VTT Voltage Generation  Mobile PC Dual Regulator  Server DDR Pow er i  Hand-held PC Pow er Description The FAN5236 PWM controller provides high ef f iciency and regulation for tw o output voltages adjustable in the range of 0.9V to 5.5V required to pow er I/O, chip-sets, and memory banks in high-performance notebook computers, PDAs, and Internet appliances. Synchronous rectification and hysteretic operation at light loads contribute to high efficiency over a w ide range of loads. The Hysteretic Mode can be disabled separately on each PWM converter if PWM...