NB685 Datasheet (data sheet) PDF





NB685 Datasheet, Synchronous Buck Converter

NB685   NB685  

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NB685 28V, 12A, Low Iq, High-Current, Sy nchronous Buck Converter with +/- 1A LD O and Buffered Reference DESCRIPTION T he NB685 provides a complete power supp ly with the highest density for DDR3, D DR3L, LPDDR3, and DDR4 memory. It integ rates a high-frequency, synchronous, re ctified, stepdown, switch-mode converte r (VDDQ) with a 1A sink/source LDO (VTT ) and buffered low noise reference (VTT REF). The NB685 operates at high effici ency over a wide output current load ra nge based on MPS proprietary switching loss reduction technology and internal low Ron power MOSFETs. Adaptive constan t-on-time (COT) control mode provides f ast transient response an

NB685 Datasheet, Synchronous Buck Converter

NB685   NB685  
d eases loop stabilization. The DC auto- tune loop provides good load and line r egulation. The VTT LDO provides 1A sink /source current capability and requires only 22μF ceramic capacitors. The VTT REF tracks VDDQ/2 with excellent 1% acc uracy. Full protection features include OC limit, OVP, UVP, thermal shutdown, and over-temperature warning (OTW). The converter requires a minimum number of external components and is available i n a QFN 3mm x 3mm package. FEATURES Wide 4.5V to 28V Operating Input Rang e  Compatible for IMVP8  135μA L ow Quiescent Current  12A Continuous Output Current  13A Peak Output Cur rent  Selectable Ultrasonic Mode  Selectable 500k/700k Switching Frequen cy  Built-In +/- 1A VTTLDO  1% Bu ffered VTTREF Output  Adaptive COT f or Fast Transient  DC Auto-Tune Loop  Stable with POSCAP and Ceramic Out put Capacitors  Over-Temperature War ning  Internal Soft Start  Output Discharge  OCL, OVP, UVP, and Therm al Shutdown  Latch-Off Re-Set via EN or Power Cycle  QFN 3mm x 3mm Packa ge APPLICATIONS  Laptop Computer  Networking Systems  Server  Dist ributed Power Systems All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For MPS green stat us, please visit the MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Tech








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