LTC4354
PRODUCTIONNegative Voltage Diode-OR Controller and Monitor
- Part Models
- 8
- 1ku List Price
- Starting From $3.29
Overview
- Controls N-Channel MOSFETs
- Replaces Power Schottky Diodes
- Less Than 1µs Turn-off Time Limits Peak Fault Current
- 80V Operation
- Smooth Switchover Without Oscillation
- No Reverse DC Current
- Fault Output
- Selectable Fault Thresholds
- Available in 8-Pin (3mm × 2mm) DFN and 8-Pin SO Packages
The LTC4354 is a negative voltage diode-OR controller that drives two external N-channel MOSFETs. It replaces two Schottky diodes and the associated heatsink, saving power and area. The power dissipation is greatly reduced by using N-channel MOSFETs as the pass transistors. Power sources can easily be ORed together to increase total system power and reliability.
When first powered up, the MOSFET body diode conducts the load current until the pass transistor is turned on. The LTC4354 servos the voltage drop across the pass transistors to ensure smooth transfer of current from one transistor to the other without oscillation.
The MOSFETs are turned off in less than 1µs whenever the corresponding power source fails or is shorted. Fast turnoff prevents the reverse current from reaching a level that could damage the pass transistors.
A fault detection circuit with an open drain output capable of driving an LED or opto-coupler indicates either MOSFET short, MOSFET open or supply failed.
Applications
- AdvancedTCA Systems
- –48V Distributed Power Systems
- Computer Systems/Servers
- Telecom Infrastructure
- Optical Networks
Documentation
Data Sheet 1
User Guide 1
Design Note 3
Technical Articles 3
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 |
|---|---|---|---|
| LTC4354CDDB#TRMPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC4354CDDB#TRPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC4354CS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC4354CS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC4354IDDB#TRMPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC4354IDDB#TRPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC4354IS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LTC4354IS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC4354CDDB#TRMPBF | PRODUCTION | |
| LTC4354CDDB#TRPBF | PRODUCTION | |
|
Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package |
||
| LTC4354CS8#PBF | PRODUCTION | |
| LTC4354CS8#TRPBF | PRODUCTION | |
| LTC4354IS8#PBF | PRODUCTION | |
| LTC4354IS8#TRPBF | PRODUCTION | |
|
Oct 12, 2022 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
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| LTC4354CS8#PBF | PRODUCTION | |
| LTC4354CS8#TRPBF | PRODUCTION | |
| LTC4354IS8#PBF | PRODUCTION | |
| LTC4354IS8#TRPBF | PRODUCTION | |
|
Jun 16, 2021 - 21_0026 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LTC4354CS8#PBF | PRODUCTION | |
| LTC4354CS8#TRPBF | PRODUCTION | |
| LTC4354IS8#PBF | PRODUCTION | |
| LTC4354IS8#TRPBF | PRODUCTION | |
|
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC4354IDDB#TRMPBF | PRODUCTION | |
| LTC4354IDDB#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Ideal Diodes and PowerPath Controllers 1 | ||
| LTC4371 | RECOMMENDED FOR NEW DESIGNS | Dual Negative Voltage Ideal Diode-OR Controller and Monitor |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC4354
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
LTC4354 Negative Voltage Diode-OR Controller and Monitor