NB685 (AKU*)

FEATURES

•  Wide 4.5V to 28V Operating Input Range
• Compatible for IMVP8
• 135μA Low Quiescent Current
• 12A Continuous Output Current
• 13A Peak Output Current
• Selectable Ultrasonic Mode
• Selectable 500k/700k Switching Frequency
• Built-In +/- 1A 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

APPLICATIONS

•  Laptop Computer
• Networking Systems
• Server
• Distributed Power Systems

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, stepdown, switch-mode converter (VDDQ) with a1A 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 1A sink/source current capability and requires only 22μF 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 is available in a QFN 3mm x 3mm package.

Keywords:
NB 685 AKU