LTC4353 - Dual Low Voltage Ideal Diode Controller
Features
- 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
Typical Application
Description
The LTC®4353 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.
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 |
|---|---|---|---|---|---|
| LTC4353CDE#PBF | 4x3 DFN-16 | DE | C | 05-08-1732 | Yes |
| LTC4353CDE#TRPBF | 4x3 DFN-16 | DE | C | 05-08-1732 | Yes |
| LTC4353CMS#PBF | MS-16 | MS | C | 05-08-1669 | Yes |
| LTC4353CMS#TRPBF | MS-16 | MS | C | 05-08-1669 | Yes |
| LTC4353IDE#PBF | 4x3 DFN-16 | DE | I | 05-08-1732 | Yes |
| LTC4353IDE#TRPBF | 4x3 DFN-16 | DE | I | 05-08-1732 | Yes |
| LTC4353IMS#PBF | MS-16 | MS | I | 05-08-1669 | Yes |
| LTC4353IMS#TRPBF | MS-16 | MS | I | 05-08-1669 | 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 | |
|---|---|---|---|---|---|---|
| LTC4353CDE#PBF | 4x3 DFN-16 | C | $4.93 | $3.45 | Yes | |
| LTC4353CDE#TRPBF | 4x3 DFN-16 | C | $3.51 | Yes | ||
| LTC4353CMS#PBF | MS-16 | C | $4.93 | $3.45 | Yes | |
| LTC4353CMS#TRPBF | MS-16 | C | $3.51 | Yes | ||
| LTC4353IDE#PBF | 4x3 DFN-16 | I | $5.64 | $3.95 | Yes | |
| LTC4353IDE#TRPBF | 4x3 DFN-16 | I | $4.01 | Yes | ||
| LTC4353IMS#PBF | MS-16 | I | $5.64 | $3.95 | Yes | |
| LTC4353IMS#TRPBF | MS-16 | I | $4.01 | 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 |
|---|---|---|---|
| DC1926A | LTC4353DE Demoboard | Dual Low Voltage Ideal Diode Controller | $75.00 | |
| Buy Now | |||
Applications
- Redundant Power Supplies
- Supply Holdup
- High Availability Systems and Servers
- Telecom and Network Infrastructure
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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:
LTC4353
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.
