Description
The FAN6550 switching regulator is designed to convert voltage supplies ranging from 2.3V to 4V into a desired output voltage or termination voltage for DDR SDRAM memory. The FAN6550 can be implemented to produce regulated output voltages in two different modes. In the default mode, when the VREF pin is open, the FAN6550 output voltage is 50% of the voltage applied to VCCQ. The FAN6550 can also be used to produce various user-defined voltages by forcing a voltage on the VREFIN pin. In this case, the output voltage follows the input VREFIN voltage. The switching regulator is capable of sourcing or sinking up to 2A of current while regulating an output VTT voltage to within 3% or less. Transient output currents of ±3A can also be accommodated.

FEATUREs
• Can source and sink up to 2A continous, 3A peak
• No heatsink required
• Integrated Power MOSFETs
• Generates termination voltages for DDR SDRAM
• VREF input available for external voltage divider
• Separate voltages for VCCQ and PVDD
• Buffered VREF output
• VOUT of ±3% or less at 2A
• Minimum external components
• 0°C to 70°C operating range
• Shutdown for standby or suspend mode operation
• Thermal Shutdown ≈ 130ºC