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reference designNB685 | Demoboard EVNB685-Q-00A

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

26V, Low IQ, High Current Synchronous Buck Converter With+/-1A and Bufferd Refference

Overview

TopologyBuck Converter
Input voltage19 V
Switching frequency500-700 kHz
Output 11.35 V / 12 A
IC revision1.1

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
  • •Server
  • •Networking Systems

More information

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Data­sheet
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Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
Qty.
SamplesAvailability & Sample
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744311068
SPECWE-HCI SMT Flat Wire High Current Inductor, 0.68 µH, 20.9 A
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance0.68 µH
Performance Rated Current20.9 A
Saturation Current @ 10%9.5 A
Saturation Current @ 30%20 A
DC Resistance3.1 mΩ
Self Resonant Frequency105 MHz
MaterialSuperflux 
Packaging Unit1000 
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