Monolithic Power Systems NB685 | Demoboard EVNB685-Q-00A

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).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 10uF 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
• 100uA 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

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

More information

• Datasheet
• IC product information