Monolithic Power Systems NB685 | Demoboard EVNB685-Q-01A

Description

The NB685 provides a complete power supplyfor DDR3, DDR3L, LPDDR3, and DDR4memory with the highest power density. Itintegrates a high frequency synchronousrectified step-down switch mode converter(VDDQ) with a 1A sink/source LDO (VTT) andbuffered low noise reference (VTTREF).The NB685 operates at high efficiency over awide output current load rang based on MPSproprietary switching loss reduction tech andinternal low Ron power MOSFETs.Adaptive Constant-On-Time (COT) controlmode provides fast transient response andeases loop stabilization. The DC auto tune loopprovides good load and line regulation.The VTT LDO provides 1A sink/source currentcapability and requires only 22uF ceramiccapacitance. The VTTREF tracks VDDQ/2 withan excellent 1% accuracy.Full protection features include OC Limit, OVP,UVP and thermal shut down and Overtemperature warning (OTW).The converter requires minimum number ofexternal components and is available in QFN 3x3packages.

Features

• Wide 4.5V to 26V Operating Input Range
• Compatible for IMVP8
• 135uA low quiescent Current
• 12A Continous 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 OutputCap
• Over Temperature Warning
• Internal Soft Start
• Output Discharge
• OCL, OVP, UVP, OTP
• Latch off Reset via EN or Power Cycle

Typical applications

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

More information

• Datasheet
• IC product information