Termination Regulator for DDR-SDRAMs - BD3539FVM

BD3539FVM 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.

Part NumberStatusPackageUnit QuantityMinimum Package QuantityPacking TypeRoHS
BD3539FVM-TRActiveMSOP830003000TapingYes

BD3539FVM Data Sheet

Specifications
GradeStandard
ch1
Vin(Min.)[V]2.7
Vin(Max.)[V]5.5
Vout (Typ.) [V]0.75 to 1.25
Iout(Max.)[A]1.0
Thermal Shut-downYes
Under Voltage Lock OutYes
Soft StartYes
Operating Temperature (Min.)[°C]-30
Operating Temperature (Max.)[°C]100
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