DC-DC CONVERTERS Non-isolated DDR/QDR Memory Bus Termination Module 

The PTHxx050Y are a new series of non-isolated dc-dc converters designed specifically for bus termination in DDR and QDR memory applications. Operating from either a 3.3 Vdc, 5 Vdc or 12 Vdc input, the modules generate a VTT output that will source or sink up to 6 A of current to accurately track their VREF input. VTT is the required bus termination supply voltage, and VREF is the reference voltage for the memory and chipset bus receiver comparators. VREF is usually set to half the VDDQ power supply voltage. The PTHxx050Y series employs an actively switched synchronous rectifier output to provide state of the art stepdown switching conversion. The products are small in size and are an ideal choice where space, performance and high efficiency are desired.

• VTT bus termination output (output tracks the system VREF)
• 6 A output current (8 A Peak)
• 3.3 Vdc, 5 Vdc or 12 Vdc input voltage
• DDR and QDR compatible
• ON/OFF inhibit (for VTT standby)
• Under-voltage lockout
• Operating temperature range: -40 ºC to +85 ºC
• Efficiencies up to 88%
• Output overcurrent protection (non-latching, auto-reset)
• Point-of-Load-Alliance (POLA) compatible
• Available RoHS compliant