NB685
Wide Vin 4.5-26V, 12A, Low Iq, High Current Synchronous Buck Converter with +/-1A LDO and Buffered Reference
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Description
The NB685 provides a complete power supply with the highest density for DDR3, DDR3L, LPDDR3, and DDR4 memory. It integrates a high-frequency, synchronous, rectified, step-down, switch-mode converter (VDDQ) with a 1 A sink/source LDO (VTT) and buffered low noise reference (VTTREF).
The NB685 operates at high efficiency over a wide output current load range based on MPS proprietary switching loss reduction technology and internal low Ron power MOSFETs.
Adaptive constant-on-time (COT) control mode provides fast transient response and eases loop stabilization. The DC auto-tune loop provides good load and line regulation.
The VTT LDO provides 1 A sink/source current capability and requires only 22 μF ceramic capacitors. The VTTREF tracks VDDQ/2 with excellent 1% accuracy.
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 it is available in a QFN 3mm x 3mm package.
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Features & Benefits
- Wide 4.5 V to 26 V Operating Input Range
- Compatible for IMVP8
- 135 μA Low Quiescent Current
- 12 A Continuous Output Current
- 13 A Peak Output Current
- Selectable Ultrasonic Mode
- Selectable 500 k/700 k Switching Frequency
- Built-In +/- 1 A VTTLDO
- 1% Buffered VTTREF Output
- Adaptive COT for Fast Transient
- DC Auto-Tune Loop
- Stable with POSCAP and Ceramic Output Capacitors
- Over-Temperature Warning
- Internal Soft Start
- Output Discharge
- OCL, OVP, UVP, and Thermal Shutdown
- Latch-Off Re-set via EN or Power Cycle
- QFN 3mm x 3mm Package

Active Part Numbers:
NB685GQ-P NB685GQ-Z
Part numbers ending in P and Z are the same parts. P and Z only indicates reel size.
Meaning of P & Z
Recommended Inductors
Molded Inductor 0.68µH
Molded Inductor 0.68µH
Inductor Selector Tool




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