LTC7819

RECOMMENDED FOR NEW DESIGNS

LTC7819

40V Low I_Q, Triple Output, 3-Phase Synchronous Step-Down Controller

RECOMMENDED FOR NEW DESIGNS

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Features

Triple Buck Synchronous Controllers
Wide Input Voltage Range: 4.5V to 40V
Wide Output Voltage Range: 0.8V to 99% • V_IN
Low Operating I_Q: 14μA (14V to 3.3V, Channel 1 On)
Spread Spectrum Operation
R_SENSE or DCR Current Sensing
Integrated Bootstrap Supply Charge Pump (Channel 1)

PassThru^™/100% Duty Cycle Capability (Channel 1), 99% Duty Cycle (Channels 2 and 3)
Programmable Fixed Frequency (100kHz to 3MHz)
Phase-Lockable Frequency (100kHz to 3MHz)
Selectable Continuous, Pulse-Skipping, or Low Ripple, Burst Mode^® Operation at Light Loads
Low Shutdown I_Q: 1.5μA
Small 40-Lead 6mm × 6mm QFN Package
AEC-Q100 Qualified for Automotive Applications

Additional Details

The LTC7819 is a high performance triple step-down synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7819 operates from a wide 4.5V to 40V input supply range. Power loss and supply noise are minimized by operating the three controller output stages out-of-phase.

The very low no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7819 features a precision 0.8V reference and power good output indicators. The MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.

The LTC7819 additionally features spread spectrum operation which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards.

APPLICATIONS

Automotive and Transportation
Industrial
Military / Avionics

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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 4

1ku List Price Starting From $2.97

Technical Documents 2

LTC7819: 40V Low I_Q, Triple Output, 3-Phase Synchronous Step-Down Controller Data Sheet (Rev.0) 10/21/2021

DC2897A - Demo Manual (Rev.0) 03/21/2022

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
LTC7819RUJ#PBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7819RUJ#TRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7819RUJ#WPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC7819RUJ#WTRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC7819RUJ#PBF
Pin/Package Drawing
40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7819RUJ#TRPBF
Pin/Package Drawing
40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7819RUJ#WPBF
Pin/Package Drawing
40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC7819RUJ#WTRPBF
Pin/Package Drawing
40-Lead QFN (6mm 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 2

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Surge Stopper, Overvoltage, and Overcurrent Protection1
LTC4381	RECOMMENDED FOR NEW DESIGNS	Low Quiescent Current eFuse with Surge Protection

DC2897A

LTC7819 | Low IQ, Triple Output Synchronous Step-Down Supply

LTC7819 | Low IQ, Triple Output Synchronous Step-Down Supply

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DC2897A

LTC7819 | Low IQ, Triple Output Synchronous Step-Down Supply

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Product Detail

Demonstration circuit 2897A is a low I_Q, triple output, synchronous step-down supply featuring the LTC7819. The circuit is optimized for high efficiency. It provides outputs of 3.3V at 12A, 8.5V at 10A and 5.0V at 12A over an input voltage range of 10V to 36V with a switching frequency of 380kHz. Each rail uses a 3mΩ sense resistor to sense the current and provides optional footprints for DCR sensing. Typical applications include automotive, transportation, industrial, military and avionics systems.

Features of the DC2897A include pin selectable light load operating modes of forced continuous mode, pulse-skipping and Burst Mode^® operation. Optional spread spectrum modulation to reduce EMI, a PLLIN pin to synchronize to an external clock, optional DCR sensing footprints, an EXTV_CC pin to reduce losses in the controller and optional footprints to parallel two or three channels.

The LTC7819 data sheet provides a complete description of the part, operational details, and applications information. DC2897A must be read in conjunction with the data sheet.

Resources

PDF

DC2897A - Demo Manual (Rev.0)

1.14 M

PDF

DC2897A - Schematic

177.97 K

ZIP

DC2897A - Design Files

6.1 M

DC2897A

LTC7819 | Low IQ, Triple Output Synchronous Step-Down Supply

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.