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reference designNB685A | Demoboard EVNB685A-Q-00A

Monolithic Power Systems NB685A | Demoboard EVNB685A-Q-00A

26 V, 12 A, Low Iq, High Current Synchronous Buck Converter with +/- 1 A LDO and Buffered Reference

Overview

TopologyBuck Converter
Input voltage4.5-26 V
Output 11.35 V / 12 A
IC revision1.0

Description

The NB685A provides a complete power supply for DDR3, DDR3L, LPDDR3, and DDR4 memory with the highest power density. It integrates a high frequency synchronous rectified step-down switch mode converter (VDDQ) with a 1A sink/source LDO (VTT) and buffered low noise reference (VTTREF). 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.

Features

  • Wide 4.5 V to 26 V Operating Input Range
  • Compatible for IMVP8
  • 135 μA Low Quiescent Current
  • 12 A Continous Output Current
  • 13 A Peak Output Current
  • Selectable Ultrasonic Mode
  • Selectable 500 k/700 k SwitchingFrequency
  • Built-in +/- 1 A VTTLDO
  • 1% Buffered VTTREF Output
  • Adaptive COT for Fast Transient
  • DC Auto-Tune Loop
  • Stable with POSCAP and Ceramic OutputCapacitors
  • Over-Temperature Warning
  • Internal Soft Start
  • Output Discharge
  • OCL, OVP, UVP, and Thermal Shutdown
  • Latch-Off Reset via EN or Power Cycle
  • QFN 3mm x 3mm Package

Typical applications

  • Networking Systems
  • Distributed Power Systems
  • Laptop Computers
  • Servers

More information

Products

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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.
Operation Force(g)
Schematic
Packaging
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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450301014042
SPECWS-SLTV THT Mini Slide Switch, Opposite Side Connection 10x2.5 mm, –, –
Simu­lation–
Availability
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Downloads6 files

EDA models: Components ZIP

CAD files ZIP

Download all 6 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWS-SLTV THT Mini Slide Switch, Opposite Side Connection 10x2.5 mm
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Packaging Unit200 
Operation Force800 g
SchematicSPDT 
PackagingBulk 
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