LT8613

RECOMMENDED FOR NEW DESIGNS

LT8613

42V, 6A Synchronous Step-Down Regulator with Current Sense and 3μA Quiescent Current

RECOMMENDED FOR NEW DESIGNS

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Part Models 4

1ku List Price Starting From $6.20

Features

Rail-to-Rail Current Sense Amplifier with Monitor
Wide Input Voltage Range: 3.4V to 42V
Ultralow Quiescent Current Burst Mode^® Operation:
- 3μA I_Q Regulating 12V_IN to 3.3V_OUT
- Output Ripple < 10mV_P-P
High Efficiency Synchronous Operation:
- 95% Efficiency at 3A, 5V_OUT from 12V_IN
- 94% Efficiency at 3A, 3.3V_OUT from 12V_IN
Fast Minimum Switch-On Time: 40ns

Low Dropout Under All Conditions: 250mV at 3A
Allows Use of Small Inductors
Low EMI
Adjustable and Synchronizable: 200kHz to 2.2MHz
Current Mode Operation
Accurate 1V Enable Pin Threshold
Internal Compensation
Output Soft-Start and Tracking
Small Thermally Enhanced 3mm × 6mm 28-Lead QFN Package

Additional Details

The LT8613 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 3µA of quiescent current. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components. The built-in current sense amplifier with monitor and control pins allows accurate input or output current regulation and limiting. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mV_P-P. A SYNC pin allows synchronization to an external clock. Internal compensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The EN/UV pin has an accurate 1V threshold and can be used to program V_IN undervoltage lockout or to shut down the LT8613 reducing the input supply current to 1µA. A capacitor on the TR/SS pin programs the output voltage ramp rate during start-up. The PG flag signals when V_OUT is within ±9% of the programmed output voltage as well as fault conditions. The LT8613 is available in a small 28-lead 3mm × 6mm QFN package with exposed pad for low thermal resistance.

Applications

Automotive and Industrial Supplies
General Purpose Step-Down
CCCV Power Supplies

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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 4

1ku List Price Starting From $6.20

Technical Documents 6

LT8613: 42V, 6A Synchronous Step-Down Regulator with Current Sense and 3μA Quiescent Current Data Sheet (Rev.A) 11/10/2014

R570 Reliability Data 03/23/2018

DC2011A - Demo Manual 05/08/2015

Design Note 1038: 42V High Power Density Buck Regulators in a Tiny QFN Package 12/07/2015

95% Efficient at 2MHz 42V Synchronous Buck 06/24/2016

High Efficiency Solar MPPT Battery Charger Using LT8611 and AD5245 07/10/2017

Design Resources 4

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
LT8613EUDE#PBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8613EUDE#TRPBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8613IUDE#PBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8613IUDE#TRPBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT8613EUDE#PBF
Pin/Package Drawing
28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT8613EUDE#TRPBF
Pin/Package Drawing
28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT8613IUDE#PBF
Pin/Package Drawing
28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LT8613IUDE#TRPBF
Pin/Package Drawing
28-Lead QFN (3mm x 6mm 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

Mar 11, 2020

- 20_0013

LT8613 Data Sheet Limit Change

LT8613EUDE#PBF

PRODUCTION

LT8613EUDE#TRPBF

PRODUCTION

LT8613IUDE#PBF

PRODUCTION

LT8613IUDE#TRPBF

PRODUCTION

pdf

PCN20_0013_Form

xls

Material_Report

pdf

Datasheet Specification Comparison

Apr 11, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

LT8613EUDE#PBF

PRODUCTION

LT8613EUDE#TRPBF

PRODUCTION

LT8613IUDE#PBF

PRODUCTION

LT8613IUDE#TRPBF

PRODUCTION

pdf

PCN19_0067_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

pdf

Qualification Results Summary

Detailed Parts List

pdf

Other

Filter by Model

Part Models

Product Lifecycle

PCN

Mar 11, 2020

- 20_0013

LT8613 Data Sheet Limit Change

LT8613EUDE#PBF

PRODUCTION

LT8613EUDE#TRPBF

PRODUCTION

LT8613IUDE#PBF

PRODUCTION

LT8613IUDE#TRPBF

PRODUCTION

pdf

PCN20_0013_Form

xls

Material_Report

pdf

Datasheet Specification Comparison

Apr 11, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

LT8613EUDE#PBF

PRODUCTION

LT8613EUDE#TRPBF

PRODUCTION

LT8613IUDE#PBF

PRODUCTION

LT8613IUDE#TRPBF

PRODUCTION

pdf

PCN19_0067_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

pdf

Qualification Results Summary

Detailed Parts List

pdf

Other

Companion Parts 1

Parts	Product Life Cycle	Description
Surge Stopper, Overvoltage, and Overcurrent Protection1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

DC2011A

LT8613EUDE Demo Board | Sync Buck, 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A

LT8613EUDE Demo Board | Sync Buck, 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A

Download

DC2011A

LT8613EUDE Demo Board | Sync Buck, 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A

Buy Now View Details

Product Detail

Demonstration Circuit 2011A is a 42V, 6A micropower synchronous step-down regulator with current sense featuring the LT8613. 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 LT8613 is a compact, high efficiency, and high speed synchronous monolithic step-down switching regulator. The integrated power switches and inclusion of all necessary circuitry reduce the components count and solution size. Ultralow 3μA quiescent current in Burst Mode^® operation achieves high efficiency at very light loads. Fast minimum on-time of 40ns enables high V_IN to low V_OUT conversion at high frequency.

Resources

ZIP

DC2011A - Design Files

932.00K

PDF

DC2011A - Demo Manual

267.00K

PDF

DC2011A - Schematic

30.00K

DC2011A

LT8613EUDE Demo Board | Sync Buck, 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A

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.