LT4351
PRODUCTIONMOSFET Diode-OR Controller
- Part Models
- 4
- 1ku List Price
- Starting From $4.21
Overview
- 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
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.
Applications
- Paralleled Power Supplies
- Uninterrupted Supplies
- High Availability Systems
- N + 1 Redundant Power Supplies
Documentation
Data Sheet 1
Technical Articles 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 |
|---|---|---|---|
| LT4351CMS#PBF | 10-Lead MSOP | ||
| LT4351CMS#TRPBF | 10-Lead MSOP | ||
| LT4351IMS#PBF | 10-Lead MSOP | ||
| LT4351IMS#TRPBF | 10-Lead MSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LT4351CMS#PBF | PRODUCTION | |
| LT4351CMS#TRPBF | PRODUCTION | |
| LT4351IMS#PBF | PRODUCTION | |
| LT4351IMS#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT4351CMS#PBF | PRODUCTION | |
| LT4351CMS#TRPBF | PRODUCTION | |
| LT4351IMS#PBF | PRODUCTION | |
| LT4351IMS#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 |
|---|---|---|
| LTC4352 | RECOMMENDED FOR NEW DESIGNS | Low Voltage Ideal Diode Controller with Monitoring |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT4351
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.