LT4351 - MOSFET Diode-OR Controller
Features
- Low Loss Replacement for ORing Diode in Multiple Sourced Power Supplies
- External N-Channel MOSFETs for High Current Capability
- Internal Boost Regulator Supply for MOSFET Gate Drive
- Wide Input Range: 1.2V to 18V
- Fast Switching MOSFET Gate Control
- Input Under and Overvoltage Detection
- STATUS and FAULT Outputs for Monitoring
- Internal MOSFET Gate Clamp
- Available in a 10-pin MSOP
AEC-Q100 data available for specific packages
Typical Application
Description
The LT4351 creates a near-ideal diode using external single or back-to-back N-channel MOSFETs. This ideal diode function permits low loss ORing of multiple power sources. Power sources can easily be ORed together to increase total system power and reliability with minimal effect on supply voltage or efficiency. Disparate power supplies can be efficiently ORed together.
The IC monitors the input supply with respect to the load and turns on the MOSFET(s) when the input supply is higher. If the MOSFET’s RDS(ON) is sufficiently small, the LT4351 will regulate the voltage across the MOSFET(s) to 15mV. A STATUS pin indicates the MOSFET on state.
An internal boost regulator generates the MOSFET gate drive voltage. Low operating voltage allows for OR’ing of supplies as low as 1.2V.
The LT4351 will disable power passage during undervoltage or overvoltage conditions. These voltages are set by resistive dividers on the UV and OV pins. The undervoltage threshold has user programmable hysteresis. Overvoltage detection is filtered to reduce false triggering.
The LT4351 is available in a 10-pin MSOP.
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 |
|---|---|---|---|---|---|
| LT4351CMS#PBF | MS-10 | MS | C | 05-08-1661 | Yes |
| LT4351CMS#TRPBF | MS-10 | MS | C | 05-08-1661 | Yes |
| LT4351IMS#PBF | MS-10 | MS | I | 05-08-1661 | Yes |
| LT4351IMS#TRPBF | MS-10 | MS | I | 05-08-1661 | 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 | |
|---|---|---|---|---|---|---|
| LT4351CMS#PBF | MS-10 | C | $2.90 | $2.50 | Yes | |
| LT4351CMS#TRPBF | MS-10 | C | $2.56 | Yes | ||
| LT4351IMS#PBF | MS-10 | I | $3.35 | $2.90 | Yes | |
| LT4351IMS#TRPBF | MS-10 | I | $2.96 | 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.Click here to view our complete list of demo boards
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 | |
|---|---|---|---|---|---|---|
| LT4351IMS#PBF | MS-10 | I | $3.35 | $2.90 | Yes | |
| LT4351IMS#TRPBF | MS-10 | I | $2.96 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Paralleled Power Supplies
- Uninterrupted Supplies
- High Availability Systems
- N + 1 Redundant Power Supplies
People Who Viewed This Product Also Viewed
- LTC4359 - Ideal Diode Controller with Reverse Input Protection
- LT4320/LT4320-1 - Ideal Diode Bridge Controller
- LTC4364 - Surge Stopper with Ideal Diode
- LTC4370 - Two-Supply Diode-OR Current Balancing Controller
- LTC4355 - Positive High Voltage Ideal Diode-OR with Input Supply and Fuse Monitors
- LTC4357 - Positive High Voltage Ideal Diode Controller
- LT4363 - High Voltage Surge Stopper with Current Limit
- LTC4412 - Low Loss PowerPath Controller in ThinSOT
- LTC4352 - Low Voltage Ideal Diode Controller with Monitoring
- LT8705 - 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller
Product Notifications
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LT4351
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.
