LTC7819

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. 0) Product Selection Table

Part Models: 4
1ku List Price: Starting From $2.97

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Part Details

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

Part Models: 4
1ku List Price: Starting From $2.97

Documentation

Data Sheet 1

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

User Guide 1

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

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

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
High Voltage Hot Swap Controllers 1
LTC4238	LAST TIME BUY	High Voltage High Current Hot Swap Controller
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LTC4381	RECOMMENDED FOR NEW DESIGNS	Low Quiescent Current eFuse with Surge Protection

Tools & Simulations

LTspice 1

LTC7819 - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

LTC7819

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.

Evaluation Kits

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

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Product Details

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

DC2897A - Demo Manual (Rev.0)
1.14 M

DC2897A - Schematic
177.97 K

DC2897A - Design Files
6.1 M

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