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reference designLT8642S | Demoboard DC2560A

Analog Devices LT8642S | Demoboard DC2560A

18V, 10A Synchronous Step-Down Silent Switcher

Overview

TopologyBuck Converter
Input voltage2.8-18 V
Switching frequency1925-2075 kHz
Output 11.2 V / 10 A

Description

Demonstration circuit 2560A is a 18V, 10A synchronous step-down Silent Switcher®2 with spread spectrum frequency modulation featuring the LT®8642S. The demo board is designed for 1.2V output from a 2.8V to 18Vinput. The LT8642S is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The integrated bypass capacitors optimize all the fast current loops and make it easier to minimize EMI/EMC emissions by reducing layout sensitivity. Selectable spread spectrum mode can further improve EMI/EMC performance. Fast minimum on-time of 20ns enables high VIN to low VOUT conversion at highfrequency.

Features

  • Silent Switcher®2 Architecture
  • Ultralow EMI Emissions On Any PCB
  • Eliminates PCB Layout Sensitivity
  • Internal Bypass Capacitors Reduce Radiated EMI
  • Optional Spread Spectrum Modulation
  • High Efficiency at High Frequency
  • Up to 96% Efficiency at 1MHz, 12VIN to 3.3VOUT
  • Up to 95% Efficiency at 2MHz, 12VIN to 3.3VOUT
  • Wide Input Voltage Range: 2.8V to 18V
  • 10A Output Current
  • External Compensation: Fast Transient Response and Current Sharing
  • Low Quiescent Current Burst Mode® Operation
  • 240µA IQ Regulating 12VIN to 1.2VOUT
  • Output Ripple < 10mVP-P
  • Fast Minimum Switch On-Time: 25ns
  • Low Dropout Under All Conditions: 50mV at 1A
  • Forced Continuous Mode
  • Adjustable and Synchronizable: 200kHz to 3MHz
  • Output Soft-Start and Power Good
  • Small 24-Lead 4mm × 4mm LQFN Package

Typical applications

  • Server Power Applications
  • General Purpose Step-Down

More information

Products

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
f(mm)
Z @ 100 MHz(Ω)
Zmax(Ω)
Test Condition Zmax
IR(mA)
Z @ 1 GHz(Ω)
H(mm)
Type
Pins
Mount
L(mm)
Working Voltage(V (AC))
Operating Temperature
Samples
74279228600
WE-MPSB EMI Multilayer Power Suppression Bead, –, 60 Ω
Simu­lation
Downloads10 files

EDA models: Components ZIP

CAD files ZIP

Electric models ZIP

Download all 10 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-MPSB EMI Multilayer Power Suppression Bead
–
Impedance @ 100 MHz60 Ω
Maximum Impedance99 Ω
Maximum Impedance458 MHz 
Rated Current5100 mA
Impedance @ 1 GHz74 Ω
Height0.8 mm
TypeHigh Current 
–
MountSMT 
Length1.6 mm
–
Operating Temperature -55 °C up to +125 °C
702935000
WA-SNSR Self-Retaining Spacer, 4.8 mm, –
Simu­lation–
Downloads3 files

CAD files ZIP

Download all 3 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWA-SNSR Self-Retaining Spacer
Drilling in Panel4.8 mm
–
–
–
–
–
–
–
–
–
Length12.7 mm
–
Operating Temperature -30 °C up to +85 °C
60800213421
WR-PHD Jumper, –, –
Simu­lation–
Downloads3 files

CAD files ZIP

Download all 3 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Jumper
–
–
–
–
Rated Current3000 mA
–
–
–
Pins2 
–
–
Working Voltage200 V (AC)
Operating Temperature -25 °C up to +105 °C
62000821121
WR-PHD Pin Header, –, –
Simu­lation–
Downloads7 files

EDA models: Components ZIP

CAD files ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header
–
–
–
–
Rated Current2000 mA
–
–
TypeStraight 
Pins8 
MountTHT 
Length8 mm
Working Voltage200 V (AC)
Operating Temperature -40 °C up to +105 °C