LT3742

PRODUCTION

LT3742

Dual, 2-Phase Step-Down Switching Controller

PRODUCTION

Part Details

8V and 5V Dual Step-Down Converter slide

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Part Models 2

1ku List Price Starting From $2.78

Features

Wide Input Voltage Range: 4V to 30V
Wide Output Voltage Range: 0.8V to V_IN
Low Shutdown I_Q: 20μA
Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
0.8V ±1.5% Voltage Reference
500kHz Current Mode Fixed Frequency Operation
Internal Boost Converter Provides Bias Rail for N-Channel MOSFET Gate Drive
Power Good Voltage Monitor for Each Output
Programmable Soft-Start
24-Lead 4mm × 4mm × 0.75mm Package

Additional Details

The LT3742 is a dual step-down DC/DC switching regulator controller that drives high side N-channel power MOSFETs. A 500kHz ﬁxed frequency current mode architecture provides fast transient response with simple loop compensation components and cycle-by-cycle current limiting. The output stages of the two controllers operate 180° out of phase to reduce the input ripple current, minimizing the noise induced on the input supply, and allowing less input capacitance.

An internal boost regulator generates a bias rail of V_IN + 7V to provide gate drive for the N-channel MOSFETs allowing low dropout and 100% duty cycle operation. The LT3742 can be used for applications where both controllers need to operate independently, or where both controllers are used to provide a single higher current output.

The device is available in a thermally enhanced 4mm × 4mm QFN package.

Applications

Satellite and Cable TV Set-Top Boxes
Distributed Power Regulation
Automotive Systems
Super Capacitor Charger

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Ask a Question

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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 2

1ku List Price Starting From $2.78

Documentation

Technical Documents 3

LT3742: Dual, 2-Phase Step-Down Switching Controller Data Sheet 05/13/2011

R530 Reliability Data 03/26/2018

DC927A - Demo Manual 09/24/2009

Design Resources 2

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
LT3742EUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT3742EUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT3742EUF#PBF
Pin/Package Drawing
24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT3742EUF#TRPBF
Pin/Package Drawing
24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LT3742EUF#PBF

PRODUCTION

LT3742EUF#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Filter by Model

Part Models

Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LT3742EUF#PBF

PRODUCTION

LT3742EUF#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Software & Part Ecosystem

Companion Parts 4

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Digital Power System Managers1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Evaluation Kit

DC927A

LT3742EFE Demo Board | 5.5V ≤ VIN ≤ 28V, VOUT1 = 5V @ 4A, VOUT2 = 3.3V @ 4A

DC927A

LT3742EFE Demo Board | 5.5V ≤ VIN ≤ 28V, VOUT1 = 5V @ 4A, VOUT2 = 3.3V @ 4A

Buy Now View Details

Product Detail

Demonstration circuit 927 is a dual output step-down converter featuring the LT3742, a two-phase nonsynchronous buck controller. The demo board operates with a 5.5V to 28V input suppy and provides outputs of 5V@4A and 3.3V@4A.

Resources

ZIP

DC927A - Design File

1.00M

PDF

DC927A - Schematic

34.00K

PDF

DC927A - Demo Manual

202.00K

DC927A

LT3742EFE Demo Board | 5.5V ≤ VIN ≤ 28V, VOUT1 = 5V @ 4A, VOUT2 = 3.3V @ 4A

Tools & Simulations

LTspice 2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.