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4TPB330ML Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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4TPB330ML Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 17 page March 2011 © 2005 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5026 • Rev. 1.0.8 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. Out-of-phase operation with 180-degree phase shift reduces input current ripple. The controller can be transformed into a complete DDR memory power supply solution by activating a designated pin. In DDR Mode, one of the channels tracks the output voltage of another channel and provides output current sink and source capability — essential for proper powering of DDR chips. The buffered reference voltage required by this type of memory is also provided. The FAN5026 monitors these outputs and generates separate PGx (power good) signals when the soft-start is completed and the output is within ±10% of the set point. Over-voltage protection prevents the output voltage from exceeding 120% of the set point. Normal operation is automatically restored when over-voltage conditions cease. Under-voltage protection latches the chip off when output drops below 75% of the set value after the soft-start sequence for this output is completed. An adjustable over-current function monitors the output current by sensing the voltage drop across the lower MOSFET. If precision current-sensing is required, an external current-sense resistor may be used. Related Resources Application Note — AN-6002 Component Calculations and Simulation Tools Ordering Information Part Number Operating Temperature Range Package Packing Method FAN5026MTCX -40 to +85°C 28-Lead Thin-Shrink Small-Outline Package (TSSOP) Tape and Reel |
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