LTC7812

RECOMMENDED FOR NEW DESIGNS

LTC7812

Low I_Q, 38V Synchronous Boost+Buck Controller

RECOMMENDED FOR NEW DESIGNS

Wide Input Range to 12V/8A Low IQ, Cascaded Boost+Buck Regulator slide

Wide Input Range to 12V/8A Low IQ, Cascaded Boost+Buck Regulator

Not the part you were looking for?

Go to Product Selection Table

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 6

1ku List Price Starting From $4.78

Features

Synchronous Boost and Buck Controllers
When Cascaded, Allows V_IN Above, Below or Equal to Regulated V_OUT
Output Remains in Regulation Through Input Dips (e.g., Cold Crank) Down to 2.5V
Wide Bias Input Voltage Range: 4.5V to 38V
Low Input and Output Ripple
Low EMI
Fast Output Transient Response
High Light Load Efficiency
Low Operating I_Q: 33μA (Both Channels On)
Low Operating I_Q: 28μA (Buck Channel On)
R_SENSE or Lossless DCR Current Sensing
Buck Output Voltage Range: 0.8V ≤ V_OUT ≤ 24V
Boost Output Voltage Up to 60V
Phase-Lockable Frequency (75kHz to 850kHz)
Small 32-Pin 5mm × 5mm QFN Package

Additional Details

The LTC7812 is a high performance synchronous Boost+Buck DC/DC switching regulator controller that drives all N-channel power MOSFET stages. It contains independent step-up (boost) and step-down (buck) controllers that can regulate two separate outputs or be cascaded to regulate an output voltage from an input voltage that can be above, below or equal to the output voltage. The LTC7812 operates from a wide 4.5V to 38V input supply range. When biased from the output of the boost regulator, the LTC7812 can operate from an input supply as low as 2.5V after start-up. The 33μA no-load quiescent current extends operating run time in battery-powered systems.

Unlike conventional buck-boost regulators, the LTC7812’s cascaded Boost+Buck solution has continuous, nonpulsating, input and output currents, substantially reducing voltage ripple and EMI. The LTC7812 has independent feedback and compensation points for the boost and buck regulation loops, enabling a fast output transient response that can be easily optimized externally.

Applications

Automotive and Industrial Power Systems
High Power Battery Operated Systems

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 6

1ku List Price Starting From $4.78

Technical Documents 3

LTC7812: Low IQ, 38V Synchronous Boost+Buck Controller Data Sheet 05/31/2017

R526 Reliability Data 03/26/2018

DC2422A - Demo Manual 03/11/2016

Design Resources 6

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
LTC7812EUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7812EUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7812HUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7812HUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7812IUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7812IUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC7812EUH#PBF
Pin/Package Drawing
32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7812EUH#TRPBF
Pin/Package Drawing
32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7812HUH#PBF
Pin/Package Drawing
32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7812HUH#TRPBF
Pin/Package Drawing
32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7812IUH#PBF
Pin/Package Drawing
32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7812IUH#TRPBF
Pin/Package Drawing
32-Lead QFN (5mm x 5mm 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

LTC7812EUH#PBF

PRODUCTION

LTC7812EUH#TRPBF

PRODUCTION

LTC7812HUH#PBF

PRODUCTION

LTC7812HUH#TRPBF

PRODUCTION

LTC7812IUH#PBF

PRODUCTION

LTC7812IUH#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Jul 31, 2020

- 20_0245

Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

LTC7812EUH#PBF

PRODUCTION

LTC7812EUH#TRPBF

PRODUCTION

LTC7812HUH#PBF

PRODUCTION

LTC7812HUH#TRPBF

PRODUCTION

LTC7812IUH#PBF

PRODUCTION

LTC7812IUH#TRPBF

PRODUCTION

pdf

PCN20_0245_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

pdf

Other

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

LTC7812EUH#PBF

PRODUCTION

LTC7812EUH#TRPBF

PRODUCTION

LTC7812HUH#PBF

PRODUCTION

LTC7812HUH#TRPBF

PRODUCTION

LTC7812IUH#PBF

PRODUCTION

LTC7812IUH#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Jul 31, 2020

- 20_0245

Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

LTC7812EUH#PBF

PRODUCTION

LTC7812EUH#TRPBF

PRODUCTION

LTC7812HUH#PBF

PRODUCTION

LTC7812HUH#TRPBF

PRODUCTION

LTC7812IUH#PBF

PRODUCTION

LTC7812IUH#TRPBF

PRODUCTION

pdf

PCN20_0245_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

pdf

Other

pdf

Qualification Results Summary

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

Alternative Parts 1

Parts	Product Life Cycle	Description
LTC7813	RECOMMENDED FOR NEW DESIGNS	Low I_Q, 60V Synchronous Boost+Buck Controller

DC2422A-C

LTC7812EUH Demo Board | Sync Boost + Sync Buck, 4V ≤ VIN ≤ 36V; VBoost = 12V, Vbuck = 12V to 5V @ 8A

DC2422A-C

LTC7812EUH Demo Board | Sync Boost + Sync Buck, 4V ≤ VIN ≤ 36V; VBoost = 12V, Vbuck = 12V to 5V @ 8A

Buy Now View Details

Product Detail

Demonstration circuit DC2422A is a step-up + step-down DC/DC converter featuring the LTC7812EUH, a high performance dual output (Boost + Buck) synchronous DC/ DC switching regulator controller. This board has a 4V to 36V input voltage range and three different output configurations. DC2422A-A generates a regulated 12V @ 8A output using the boost and buck converter combination. DC2422A-B provides a quasi-regulated output voltage between 10V and 16V; the circuit steps voltages lower than 10V up to 10V, passes voltages between 10V and 16V, and steps voltage above 16V down to 16V, providing a loosely regulated 12V bus. DC2422A-C boosts the input voltage up to 12V and then steps this voltage down to 5V @ 8A, simulating a power supply designed to provide 5V output power even during cold crank conditions as low as 4V.

Resources

PDF

DC2422A - Schematic

91.00K

PDF

DC2422A - Demo Manual

423.00K

ZIP

DC2422A - Design Files

1.00M

DC2422A-A

LTC7812EUH Demo Board | Sync Buck + Sync Boost, 4V ≤ VIN ≤ 36V; VOUT = 12V @ 8A

DC2422A-A

LTC7812EUH Demo Board | Sync Buck + Sync Boost, 4V ≤ VIN ≤ 36V; VOUT = 12V @ 8A

Buy Now View Details

Product Detail

Resources

PDF

DC2422A - Schematic

91.00K

PDF

DC2422A - Demo Manual

423.00K

ZIP

DC2422A - Design Files

1.00M

DC2422A-B

LTC7812EUH Demo Board | Sync Boost + Sync Buck, 4V ≤ VIN ≤ 36V; VOUT1 (Quasi Regulated) = 10V-16V @ 6-8A

DC2422A-B

LTC7812EUH Demo Board | Sync Boost + Sync Buck, 4V ≤ VIN ≤ 36V; VOUT1 (Quasi Regulated) = 10V-16V @ 6-8A

Buy Now View Details

Product Detail

Resources

PDF

DC2422A - Schematic

91.00K

PDF

DC2422A - Demo Manual

423.00K

ZIP

DC2422A - Design Files

1.00M

DC2422A-C

LTC7812EUH Demo Board | Sync Boost + Sync Buck, 4V ≤ VIN ≤ 36V; VBoost = 12V, Vbuck = 12V to 5V @ 8A

DC2422A-A

LTC7812EUH Demo Board | Sync Buck + Sync Boost, 4V ≤ VIN ≤ 36V; VOUT = 12V @ 8A

DC2422A-B

LTC7812EUH Demo Board | Sync Boost + Sync Buck, 4V ≤ VIN ≤ 36V; VOUT1 (Quasi Regulated) = 10V-16V @ 6-8A

LTspice 1

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

LTC7812 - PMIC and Multifunction

5.07 K

LTpowerCAD 2

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