LT8603
PRODUCTION42V, Low IQ, Quad Output Triple Monolithic Buck Converter and Boost Controller
- Part Models
- 12
- 1ku List Price
- Starting From $4.47
Overview
- Flexible Power Supply System Capable of Four Regulated Outputs with VBATT << VOUT
- 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 VBATT << VOUT
- Selectable Burst Mode® Operation Allows Low 28µA IQ 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
The LT8603 is a highly flexible, quad output regulator combining two high input voltage capable monolithic step-down switching regulators, one low input voltage capable monolithic step-down regulator, and a boost controller to satisfy a wide range of applications while occupying minimal board space.
With the boost controller configured to supply the chip VIN supply, the LT8603 produces three precisely regulated outputs even when the boost input voltage falls significantly below the regulated output voltages, such as during an automotive cold crank scenario. Alternatively, with the boost controller driven from one of the step-down regulator outputs or configured as a SEPIC, the LT8603 provides four precisely regulated outputs over a wide input voltage range.
The LT8603 provides robust regulation by including a cycle-by-cycle current limit for all step-down regulators, thermal shutdown, and a boost controller that can tolerate reverse battery connections and negative transient input voltages down to –42V.
Applications
- Automotive Stop-Start and Cold Crank Ride Through
- Last-Gasp CPU Power Hold-Up
- Industrial Controls and Power Supplies
Documentation
Data Sheet 1
User Guide 2
Design Note 2
Technical Articles 2
Analog Dialogue 1
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) | ||
| LT8603EUJ#TRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT8603EUJ#WPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT8603EUJ#WTRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT8603IUJ#PBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT8603IUJ#TRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT8603IUJ#WPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT8603IUJ#WTRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT8603JUJ#PBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT8603JUJ#TRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT8603JUJ#WPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | ||
| LT8603JUJ#WTRPBF | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 17, 2025 - 25_0043 Change of Gold to Copper Wire and BOM (Automotive) |
||
| 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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LTspice 1
Models for the following parts are available in LTspice:
- LT8603
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.
