LTC4353
RECOMMENDED FOR NEW DESIGNSDual Low Voltage Ideal Diode Controller
- Part Models
- 8
- 1ku List Price
- Starting From $5.23
Overview
- Low Loss Replacement for Power Diodes
- Controls N-Channel MOSFETs
- 0V to 18V Supply ORing or Holdup
- 1μs Gate Turn-On and Turn-Off Time
- Enable Inputs
- MOSFET On-Status Outputs
- 16-Lead MSOP and DFN (4mm × 3mm) Packages
The LTC4353 controls external N-channel MOSFETs to implement an ideal diode function. It replaces two high power Schottky diodes and their associated heat sinks, saving power and board area. The ideal diode function permits low loss power supply ORing and supply holdup applications.
The LTC4353 regulates the forward-voltage drop across the MOSFET to ensure smooth current transfer in diode-OR applications. A fast turn-on reduces the load voltage droop during supply switchover. If the input supply fails or is shorted, a fast turn-off minimizes reverse-current transients.
The controller operates with supplies from 2.9V to 18V. If both supplies are below 2.9V, an external supply is needed at the VCC pin. Enable inputs can be used to turn off the MOSFET and put the controller in a low current state. Status outputs indicate whether the MOSFETs are on or off.
Applications
- Redundant Power Supplies
- Supply Holdup
- High Availability Systems and Servers
- Telecom and Network Infrastructure
Documentation
Data Sheet 1
User Guide 1
Product Selection Guide 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 |
|---|---|---|---|
| LTC4353CDE#PBF | 16-Lead DFN (4mm x 3mm w/ EP) | ||
| LTC4353CDE#TRPBF | 16-Lead DFN (4mm x 3mm w/ EP) | ||
| LTC4353CMS#PBF | 16-Lead MSOP | ||
| LTC4353CMS#TRPBF | 16-Lead MSOP | ||
| LTC4353IDE#PBF | 16-Lead DFN (4mm x 3mm w/ EP) | ||
| LTC4353IDE#TRPBF | 16-Lead DFN (4mm x 3mm w/ EP) | ||
| LTC4353IMS#PBF | 16-Lead MSOP | ||
| LTC4353IMS#TRPBF | 16-Lead MSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LTC4353CMS#PBF | PRODUCTION | |
| LTC4353CMS#TRPBF | PRODUCTION | |
| LTC4353IMS#PBF | PRODUCTION | |
| LTC4353IMS#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC4353CMS#PBF | PRODUCTION | |
| LTC4353CMS#TRPBF | PRODUCTION | |
| LTC4353IMS#PBF | PRODUCTION | |
| LTC4353IMS#TRPBF | PRODUCTION | |
|
May 5, 2026 - 25_0119 Bond Wire Change from Gold to Copper |
||
| LTC4353IDE#PBF | PRODUCTION | |
| LTC4353IDE#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 |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LTC4236 | RECOMMENDED FOR NEW DESIGNS | Dual Ideal Diode-OR and Single Hot Swap Controller with Current Monitor |
| Ideal Diodes and PowerPath Controllers 1 | ||
| LTC4355 | RECOMMENDED FOR NEW DESIGNS | Positive High Voltage Ideal Diode-OR with Input Supply and Fuse Monitors |
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC4353
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
LTC4353DE Demo Board | Dual Low Voltage Ideal Diode Controller