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reference designLT8643SA | Demoboard EVAL-LT8643SA-AZ

Analog Devices LT8643SA | Demoboard EVAL-LT8643SA-AZ

42V, 6A Synchronous Step-Down Silent Switcher 2

Overview

TopologyBuck Converter
Input voltage5.8-42 V
Switching frequency1850-2150 kHz
Output 15 V / 6 A

Description

The demonstration circuit EVAL-LT8643SA-AZ is a 42V, 6A micropower synchronous step-down second generation Silent Switcher® with spread spectrum frequency modulation featuring the LT8643SA. The demo board is designed for 5V output from a 5.8V to 42V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8643SA is a compact, ultra-low 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. Ultra-low quiescent current in Burst Mode® operation achieves high efficiency at very light loads. Fast minimum on-time of 30ns enables high VIN to low VOUT conversion at high frequency.

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 5VOUT
  • Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT
  • Wide Input Voltage Range: 3.4V to 42V
  • Output Voltage Range: 0.97V to 10V(LT8640S/LT8643S); 0.97V to (VIN – 0.5V) (LT8640SA/LT8643SA)
  • 6A Maximum Continuous, 7A Peak Output
  • Ultralow Quiescent Current Burst Mode® Operation
  • 2.5µA IQ Regulating 12VIN to 3.3VOUT (LT8640S/LT8640SA)
  • Output Ripple < 10mVP-P
  • External Compensation: Fast Transient Response and Current Sharing (LT8643S)
  • Robust High VOUT Operation (LT8640SA/LT8643SA)
  • Safely Tolerates High Reverse Current
  • Fast Minimum Switch On-Time: 30ns
  • Low Dropout Under All Conditions: 100mV at 1A
  • Forced Continuous Mode
  • Adjustable and Synchronizable: 200kHz to 3MHz
  • Output Soft-Start and Tracking
  • Small 24-Lead 4mm × 4mm LQFN Package
  • AEC-Q100 Qualified for Automotive Applications

Typical applications

  • Industrial Supplies
  • Automotive Supplies

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
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
SamplesAvailability & Sample
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74279226101
SPECWE-MPSB EMI Multilayer Power Suppression Bead, 100 Ω, 160 Ω
Simu­lation
Availability
–
Downloads10 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-MPSB EMI Multilayer Power Suppression Bead
Impedance @ 100 MHz100 Ω
Maximum Impedance160 Ω
Maximum Impedance1100 MHz 
Rated Current8000 mA
Impedance @ 1 GHz150 Ω
Height2.3 mm
TypeHigh Current 
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MountSMT 
Length4.5 mm
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Operating Temperature -55 °C up to +125 °C
–Check availability
60800213421
SPECWR-PHD Jumper, –, –
Simu­lation–
Availability
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Downloads3 files

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

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