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reference designLT8350S | Demoboard EVAL-LT8350S-AZ

Analog Devices LT8350S | Demoboard EVAL-LT8350S-AZ

LT8350S 40VIN, 18VOUT, 6A Synchronous Buck-Boost Silent Switcher 2

Overview

TopologyBuck-Boost Converter
Input voltage3-40 V
Output 112 V / 2.5 A

Description

The EVAL-LT8350S-AZ Evaluation board is a 40V synchronous buck-boost converter featuring the LT®8350S. It drives up to 2.5A load at 12V output when VIN is between 9V and 40V and will run down to 3VIN with reduced output current. EVAL-LT8350S-AZ runs at 350kHz switching frequency with spread spectrum frequency modulation (SSFM) disabled. When enabled, SSFM spreads the switching frequency of the LT8350S from fSW to fSW + 25% for a reduced electromagnetic interference (EMI) emission.

Features

  • 3V–40V Operating Input Voltage
  • Reduced EMI emissions for CISPR 25 Class 5
  • Spread Spectrum Frequency Modulation
  • Input and Output EMI filter
  • In-built Input and Output high-frequency capacitors
  • Adjustable UVLO, VOUT, fSW, Output Current and Limit
  • Voltage-Monitoring (PGOOD) and Current-Monitoring(ISMON)
  • Configurable SYNC pin for Forced Continuous Mode(FCM), Discontinuous Conduction Mode (DCM),SSFM, and external Frequency Synchronization
  • Feed Forward Function for improved transient response

Typical applications

  • USB Power Delivery (USB-PD) Source
  • Industrial Systems, Voltage Regulator with Accurate Current Limit
  • High-Frequency Battery-Powered System
  • Automotive Systems
  • Telecom Systems

More information

Parts approved by Analog Devices

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f(mm)
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702935000
SPECWA-SNSR Self-Retaining Spacer, 4.8 mm, –
Availability
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Downloads3 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWA-SNSR Self-Retaining Spacer
Drilling in Panel4.8 mm
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–
–
Length12.7 mm
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–
Operating Temperature -30 °C up to +85 °C
–
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60800213421
SPECWR-PHD Jumper, –, 2
Availability
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Downloads3 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWR-PHD Jumper
–
Pins2 
–
–
–
Rated Current3 A
Working Voltage200 V (AC)
Operating Temperature -25 °C up to +105 °C
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62000311121
SPECWR-PHD Pin Header, –, 3
Availability
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Downloads7 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header
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Pins3 
TypeStraight 
MountTHT 
Length6 mm
Rated Current2 A
Working Voltage200 V (AC)
Operating Temperature -40 °C up to +105 °C
PackagingBag 
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62000821121
SPECWR-PHD Pin Header, –, 8
Availability
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Downloads7 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header
–
Pins8 
TypeStraight 
MountTHT 
Length8 mm
Rated Current2 A
Working Voltage200 V (AC)
Operating Temperature -40 °C up to +105 °C
PackagingBag 
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Additional parts recommended by Würth Elektronik

Recommended parts are Würth Elektronik alternatives that are not formally approved for this reference design. Please verify it is suitable for your application, and contact us if you have any questions.

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Order Code
Data­sheet
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Status
Product series
L(µH)
IRP,40K(A)
ISAT,30%(A)
RDC typ.(mΩ)
RDC max.(mΩ)
fres(MHz)
Mount
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744393465068
SPECWE-XHMI SMT Power Inductor, 6.8 µH, 13.4 A
Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-XHMI SMT Power Inductor
Inductance6.8 µH
Performance Rated Current13.4 A
Saturation Current @ 30%10.9 A
DC Resistance12.5 mΩ
DC Resistance14 mΩ
Self Resonant Frequency13 MHz
MountSMT 
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