LT8603

PRODUCTION

42V, Low I_Q, Quad Output Triple Monolithic Buck Converter and Boost Controller

Data Sheet (Rev. C) Product Selection Table

Part Models: 12
1ku List Price: Starting From $4.06

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Overview

Flexible Power Supply System Capable of Four Regulated Outputs with V_BATT << V_OUT
Two High Voltage Synchronous Buck Regulators
- 3V to 42V Input Voltage Range
- Output Currents Up to 2.5A and 1.5A
One Low Voltage Synchronous Buck Regulator
- 2.6V to 5.5V Input Voltage Range
- Output Currents Up to 1.8A
One Boost Controller Allows Buck Converters to Regulate with V_BATT << V_OUT

Selectable Burst Mode^® Operation Allows Low 28µA I_Q with High Voltage Channels Active
Programmable Power-On Reset
Individual Channel Power Good Indicators
Step-Down Switching Frequency: 250kHz to 2.2MHz
Available in 40-Lead QFN (6mm × 6mm) Package
AEC-Q100 Qualified for Automotive Applications

Part Models: 12
1ku List Price: Starting From $4.06

Documentation

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
LT8603EUJ#PBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8603EUJ#TRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8603EUJ#WPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8603EUJ#WTRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8603IUJ#PBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8603IUJ#TRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8603IUJ#WPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8603IUJ#WTRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8603JUJ#PBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8603JUJ#TRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8603JUJ#WPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8603JUJ#WTRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 17, 2025 - 25_0043 Change of Gold to Copper Wire and BOM (Automotive)
		PCN25_0043_Form Material_Report Delta Qualification Matrix Qualification Results Summary
LT8603EUJ#PBF	PRODUCTION
LT8603EUJ#TRPBF	PRODUCTION
LT8603EUJ#WPBF	PRODUCTION
LT8603EUJ#WTRPBF	PRODUCTION
LT8603IUJ#PBF	PRODUCTION
LT8603IUJ#TRPBF	PRODUCTION
LT8603IUJ#WPBF	PRODUCTION
LT8603IUJ#WTRPBF	PRODUCTION
LT8603JUJ#PBF	PRODUCTION
LT8603JUJ#TRPBF	PRODUCTION
LT8603JUJ#WPBF	PRODUCTION
LT8603JUJ#WTRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice 1

LT8603 Demo Circuit - Cold Crank Tolerant Automotive Triple Output Supply (3-42V to 5V @ 1.5A, 3.3V @ 2.5A, 1.8V @ 1.8A)

Models for the following parts are available in LTspice:

LT8603

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LT8603

Overview

Documentation

Data Sheet 1

User Guide 2

Design Note 2

Technical Articles 2

Analog Dialogue 1