ROHM BD3539FVM-TR

BD3539 is a termination regulator that complies with JEDEC requirements for DDR1-SDRAM, DDR2-SDRAM, and DDR3-SDRAM. This linear power supply uses a built-in N-channel MOSFET and high-speed OP-AMPS specially designed to provide excellent transient response. It has a sink/source current capability of up to 1A and has a power supply bias requirement of 3.3 V (for DDR2 and DDR3) and 5.0 V (for DDR1, DDR2, and DDR3) for driving the N-channel MOSFET. By employing an independent reference voltage input (VDDQ) and a feedback pin (VTTS), this termination regulator provides excellent output voltage accuracy and load regulation as required by JEDEC standards. Additionally, BD3539 has a reference power supply output (VREF) for DDR-SDRAM or for memory controllers. Unlike the VTT output that goes to “Hi-Z” state, the VREF output is kept unchanged when EN input is changed to “Low”, making this IC suitable for DDR-SDRAM under “Self Refresh” state.

• Incorporates a Push-Pull Power Supply for Termination (VTT)
• Incorporates a Reference Voltage Circuit (VREF)
• Incorporates an Enabler
• Incorporates an Under Voltage Lockout (UVLO)
• Incorporates a Thermal Shutdown Protector (TSD)
• Compatible with Dual Channel (DDR1, DDR2, DDR3)
• Usable Ceramic Capacitor at Output

• Power Supply for DDR 1/2/3 - SDRAM