LT8342

RECOMMENDED FOR NEW DESIGNS

LT8342

40V, 9A, Low IQ Synchronous Step-Up Silent Switcher with Input Disconnect and PassThru

RECOMMENDED FOR NEW DESIGNS

Part Details

LT8342 Typical Application Circuit slide

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Part Models 3

1ku List Price Starting From $4.18

Features

Silent Switcher™ Architecture

Ultralow EMI Emissions
Optional Spread Spectrum Frequency Modulation

Integrated 40V, 9A Power Switches
Output Short Protection/Inrush Current Reduction
Wide Input Voltage Range: 2.8V to 40V
Output Voltage Programmable up to 36V

Optional 2 Pins select 21 output voltages

Low V_IN Pin Quiescent Current:

350nA In Shutdown; 9μA In Burst Mode; 12μA In PassThru™ (V_IN ≥ V_OUT)

100% Duty Cycle Capability
Adjustable and Synchronizable: 300kHz to 3MHz
Pulse-Skipping or Burst Mode at Light Load
Output Soft-Start and Power Good Monitoring
Small 24-Lead (4mm × 4mm) LQFN Package

Additional Details

The LT^®8342 is a low I_Q, synchronous step-up DC/DC converter. It features a Silent Switcher architecture and optional spread spectrum frequency modulation to minimize electromagnetic interference (EMI) emissions while delivering high efficiencies at high switching frequencies. Output short circuit protection and inrush current reduction are optional.

The wide input/output voltage range, low V_IN pin quiescent current in Burst Mode operation, and 100% duty cycle capability for the synchronous MOSFET in PassThru operation (V_IN ≥ V_OUT) make the LT8342 ideally suited for general-purpose step-up and automotive Pre- Boost applications.

To reduce V_OUT quiescent current in the feedback loop, an optional internal resistor divider (≥10MΩ) and two pins select 21 output voltage levels.

The LT8342 integrates 40V, 9A power switches, operating at a switching frequency programmable between 300kHz and 3MHz and synchronizable to an external clock. The LT8342 features a programmable output soft-start, output power good flag, and output overvoltage lockout.

APPLICATIONS

Automotive and Industrial Power Supplies

General Purpose Step-Up

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 3

1ku List Price Starting From $4.18

Documentation

Technical Documents 1

LT8342: 40V, 9A, Low IQ Synchronous Step-Up Silent Switcher with Input Disconnect and PassThru Data Sheet (Rev.0) 07/19/2024

Design Resources 3

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT8342RV#PBF	24-Lead (4mm × 4mm × 0.95mm)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8342RV#TRMPBF	24-Lead (4mm × 4mm × 0.95mm)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8342RV#TRPBF	24-Lead (4mm × 4mm × 0.95mm)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT8342RV#PBF
Pin/Package Drawing
24-Lead (4mm × 4mm × 0.95mm)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT8342RV#TRMPBF
Pin/Package Drawing
24-Lead (4mm × 4mm × 0.95mm)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT8342RV#TRPBF
Pin/Package Drawing
24-Lead (4mm × 4mm × 0.95mm)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

Software & Part Ecosystem

Evaluation Kit

EVAL-LT8342-AZ

Evaluates: LT8342 in 24V Output Voltage Application

Evaluates: LT8342 in 24V Output Voltage Application

Download

EVAL-LT8342-AZ

Evaluates: LT8342 in 24V Output Voltage Application

Features and Benefits

Input Voltage Range: 6V to 20V
24V Output Voltage
Up to 3A Load Current at 12V Input
2MHz Switching Frequency
High 95.1% Efficiency (V_IN = 12V, I_OUT = 2.5A)
Enable/UVLO Input, Resistor-Programmable UVLOThreshold
Selectable Mode of operation
Output Short Protection/Inrush Current Reduction
Input Disconnect
PassThru Operation
External Frequency Synchronization
External Compensation
Overtemperature Protection
Proven Printed Circuit Board (PCB) Layout
Fully Assembled and Tested

Buy Now View Details

Product Detail

The EVAL-LT8342-AZ evaluation board provides a proven design to evaluate the LT8342, a 40V, 9A, Low IQ Synchronous Step-Up Silent Switcher™ with Input Disconnect and PassThru™. The application circuit is configured to demonstrate optimum performance and component size. Using the board layout example, optimized for Electromagnetic Interference (EMI), and thermal performance, will help ensure the designer sees similar performance in their system.

The evaluation board is configured to run at 2MHz with a 24V output voltage from an input voltage range of 6V to 20V and deliver up to 3A load current when V_IN is 12V.

The evaluation board features an adjustable input undervoltage-lockout, external clock synchronization, thermal shutdown, selectable mode of operation, input disconnect, and PassThru.

The LT8342 converter data sheet provides a complete description of the part that should be read in conjunction with this user guide before operating the evaluation board.

Resources

PDF

EVAL-LT8342-AZ User Guide: Evaluates: LT8342 in 24V Output Voltage Application (Rev.0)