LT8612

PRODUCTION

LT8612

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

PRODUCTION

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Part Models 8

1ku List Price Starting From $5.90

Features

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

Safely Tolerates Inductor Saturation in Overload Conditions
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
AEC-Q100 Qualified for Automotive Applications

Additional Details

The LT8612 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. 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 LT8612 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 LT8612 is available in a small 3mm × 6mm 28-lead QFN package with exposed pad for low thermal resistance.

APPLICATIONS

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

View All Documentation

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 8

1ku List Price Starting From $5.90

Technical Documents 5

LT8612: 42V, 6A Synchronous Step-Down Regulator with 3μA Quiescent Current Data Sheet (Rev.B) 12/10/2013

R570 Reliability Data 03/23/2018

DC2132A - Demo Manual 05/22/2014

DC2010A - Demo Manual 09/16/2015

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

Reference Materials 1

Power Management Solutions for NXP Processors 04/09/2018

Design Resources 8

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
LT8612EUDE#PBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8612EUDE#TRPBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8612EUDE#WPBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8612EUDE#WTRPBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8612IUDE#PBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8612IUDE#TRPBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8612IUDE#WPBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8612IUDE#WTRPBF	28-Lead QFN (3mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT8612EUDE#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

LT8612EUDE#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

LT8612EUDE#WPBF
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

LT8612EUDE#WTRPBF
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

LT8612IUDE#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

LT8612IUDE#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

LT8612IUDE#WPBF
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

LT8612IUDE#WTRPBF
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

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

DC2010A

LT8612 Demo Circuit | 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A

LT8612 Demo Circuit | 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A

Download

DC2010A

LT8612 Demo Circuit | 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A

Buy Now View Details

Product Detail

Demonstration circuit 2010A is a 42V, 6A micropower synchronous step-down regulator featuring the LT8612. 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 LT8612 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

PDF

DC2010A - Schematic

30.00K

ZIP

DC2010A - Design Files

1.00M

PDF

DC2010A - Demo Manual

219.00K

DC2132A

24V 3A Constant Voltage, Constant Current Bench Supply Featuring LT3081, LT8612, LT3092

DC2132A

24V 3A Constant Voltage, Constant Current Bench Supply Featuring LT3081, LT8612, LT3092

Buy Now View Details

Product Detail

DC2132A is a 24V 3A constant voltage, constant current bench supply. It regulates any output voltage from 0V to 24V and any output current from 0A to 3A. It runs from 10V to 40V input although the output voltage should remain 5V or more below the input voltage.

Resources

PDF

DC2132A - Schematic

91.00K

PDF

DC2132A - Demo Manual

546.00K

ZIP

DC2132A - Design Files

3.00M

DC2010A

LT8612 Demo Circuit | 5.8V ≤ VIN ≤ 42V, VOUT = 5V @ 6A

DC2132A

24V 3A Constant Voltage, Constant Current Bench Supply Featuring LT3081, LT8612, LT3092

LTspice 3

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.

Lt Spice

LT3081/LT8612/LTC3632/LT3092 Demo Circuit - Constant Voltage, Constant Current Bench Supply (10-40V to 0-25V @ 0-3.1A)

9.00K

Lt Spice

LT8612 Demo Circuit - µPower Buck Converter (5.8-42V to 5V @ 6A)

2.00K

Lt Spice

LT8612 - Step-Down (Buck) Regulators

1.99 K

LTpowerCAD 1

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

To open the project file for this circuit:

Step 1: Download and install LTpowerCAD on your computer.

Step 2: Click on the link(s) in the section below to download part-specific project files.

Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.

LTpowerCAD download and documentation

Simulation Model

LTpowerCAD

LT8612 Project - 42V, 6A μPower Synchronous Buck Regulator (5.8-42V to 5V @ 6A)

NXP (Freescale) QorIQ T1023RDB

Download

NXP (Freescale) QorIQ T1023RDB

Circuits from the lab

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications

View Detailed Reference Design

Part Used 4

LTC3600

LTC3605A

LT8612

LT3021
LT3021-1.2
LT3021-1.5
LT3021-1.8

NXP (Freescale) QorIQ LS1088A-RDB

Download

NXP (Freescale) QorIQ LS1088A-RDB

Circuits from the lab

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications

View Detailed Reference Design