LT8228

RECOMMENDED FOR NEW DESIGNS

Bidirectional Synchronous 100V Buck/Boost Controller with Reverse Supply, Reverse Current and Fault Protection

Data Sheet (Rev. C) Product Selection Table

Part Models: 10
1ku List Price: Starting From $7.77

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Overview

Bidirectional Voltage or Current Regulation
Bidirectional Reverse Current Protection
Input and Output Negative Voltage Protection to –40V
Bidirectional Inrush Current Limit and Boost Output Short Protection
Switching MOSFET Short Detection and Protection
10V Gate Drive
Wide Input and Output Voltage Range Up to 100V
Feedback Voltage Tolerance: ±1.0% Over Temperature

Bidirectional Programmable Current Regulation and Monitoring
Extensive Self-Test, Diagnostics and Fault Reporting
Programmable Fixed or Synchronizable Switching Frequency: 80kHz to 600kHz
Programmable Soft-Start and Dynamic Current Limit
Masterless, Fault Tolerant Current Sharing

The LT8228 is a 100V bidirectional constant-current or constant-voltage synchronous buck or boost controller with independent compensation network. The direction of the power flow is automatically determined by the LT8228 or externally controlled. The input and output protection MOSFETs protect against negative voltages, control inrush currents and provide isolation between terminals under fault conditions such as switching MOSFET shorts. In buck mode, the protection MOSFETs at the V₁ terminal prevents reverse current. In boost mode, the same MOSFETs regulate the output inrush current and protects itself with an adjustable timer circuit breaker.

The LT8228 offers bidirectional input and output current limit as well as independent current monitoring. Masterless, fault tolerant current sharing allows any LT8228 in parallel to be added or subtracted while maintaining current sharing accuracy. Internal and external fault diagnostics and reporting are available via the FAULT and REPORT pins. The LT8228 is available in a 38-lead TSSOP package.

Applications

Dual Battery Automotive and Industrial Systems
High Power System Backup and Supply Stabilization
“N+1” Redundant, High Reliability Power Supplies
Power Interrupt Protection System

Part Models: 10
1ku List Price: Starting From $7.77

Documentation

Informational 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
LT8228EFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8228EFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8228HFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8228HFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8228HFE#WPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8228HFE#WTRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8228IFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8228IFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8228IFE#WPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT8228IFE#WTRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LT8228EFE#PBF	PRODUCTION
LT8228EFE#TRPBF	PRODUCTION
LT8228HFE#PBF	PRODUCTION
LT8228HFE#TRPBF	PRODUCTION
LT8228HFE#WPBF	PRODUCTION
LT8228HFE#WTRPBF	PRODUCTION
LT8228IFE#PBF	PRODUCTION
LT8228IFE#TRPBF	PRODUCTION
LT8228IFE#WPBF	PRODUCTION
LT8228IFE#WTRPBF	PRODUCTION
Mar 20, 2020 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process
		PCN19_0067_Form Material_Report Qualification Results Summary Other
LT8228EFE#PBF	PRODUCTION
LT8228EFE#TRPBF	PRODUCTION
LT8228HFE#PBF	PRODUCTION
LT8228HFE#TRPBF	PRODUCTION
LT8228IFE#PBF	PRODUCTION
LT8228IFE#TRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT8228

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

LT8228 Bidirectional Demo Board | 36V ≥ V1 ≥ 56V; 8V ≥ V2 ≥ 14V; V1 Max IOUT = 7A, V2 Max IOUT = 35A

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Product Details

Demonstration circuit 2351A is a high voltage, high efficiency synchronous buck or boost DC/DC converter. It is designed to have 36V to 56V on one side and 8V to 14V on the other side. It can supply a 35A maximum output current in buck mode and delivers 7A of current in boost mode. The demo board features the LT8228EFE controller. This part can seamlessly transition from bucking to boosting. With built-in circuit breaker function and other protection features, the LT8228 is ideal for high reliability systems requiring N+1 redundancy or other protections in industrial, automotive, medical, military, and avionics applications.

The DC2351A is designed to be paralleled with other DC2351A boards to increase the total output current. With adequate heatsinking or airflow, the output current can be increased.