LTC4354 - Negative Voltage Diode-OR Controller and Monitor
Features
- 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
AEC-Q100 data available for specific packages
Typical Application
Description
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.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC4354CDDB#PBF | 3x2 DFN-8 | DDB | C | 05-08-1702 | Yes |
| LTC4354CDDB#TRMPBF | 3x2 DFN-8 | DDB | C | 05-08-1702 | Yes |
| LTC4354CDDB#TRPBF | 3x2 DFN-8 | DDB | C | 05-08-1702 | Yes |
| LTC4354CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC4354CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LTC4354IDDB#PBF | 3x2 DFN-8 | DDB | I | 05-08-1702 | Yes |
| LTC4354IDDB#TRMPBF | 3x2 DFN-8 | DDB | I | 05-08-1702 | Yes |
| LTC4354IDDB#TRPBF | 3x2 DFN-8 | DDB | I | 05-08-1702 | Yes |
| LTC4354IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LTC4354IS8#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC4354CDDB#PBF | 3x2 DFN-8 | C | $2.73 | Yes | ||
| LTC4354CDDB#TRMPBF | 3x2 DFN-8 | C | $2.73 | $2.13 | Yes | |
| LTC4354CDDB#TRPBF | 3x2 DFN-8 | C | $2.73 | $2.11 | Yes | |
| LTC4354CS8#PBF | SO-8 | C | $2.60 | $1.95 | Yes | |
| LTC4354CS8#TRPBF | SO-8 | C | $2.01 | Yes | ||
| LTC4354IDDB#PBF | 3x2 DFN-8 | I | $3.33 | Yes | ||
| LTC4354IDDB#TRMPBF | 3x2 DFN-8 | I | $3.33 | $2.53 | Yes | |
| LTC4354IDDB#TRPBF | 3x2 DFN-8 | I | $3.33 | $2.51 | Yes | |
| LTC4354IS8#PBF | SO-8 | I | $3.10 | $2.35 | Yes | |
| LTC4354IS8#TRPBF | SO-8 | I | $2.41 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC852A | LTC4354 Negative Voltage Diode-OR Controller and Monitor | $50.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC4354IDDB#PBF | 3x2 DFN-8 | I | $3.33 | Yes | ||
| LTC4354IDDB#TRMPBF | 3x2 DFN-8 | I | $3.33 | $2.53 | Yes | |
| LTC4354IDDB#TRPBF | 3x2 DFN-8 | I | $3.33 | $2.51 | Yes | |
| Buy Now • Request Samples | ||||||
Applications
- AdvancedTCA Systems
- –48V Distributed Power Systems
- Computer Systems/Servers
- Telecom Infrastructure
- Optical Networks
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Design Tools
LTspice
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Models for the following parts are available in LTspice:
LTC4354
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
