LTC4355 - Positive High Voltage Ideal Diode-OR with Input Supply and Fuse Monitors
Features
- Replaces Power Schottky Diodes
- Controls N-Channel MOSFETs
- 0.3μs Turn-Off Time Limits Peak Fault Current
- Wide Operating Voltage Range: 9V to 80V
- Smooth Switchover without Oscillation
- No Reverse DC Current
- Monitors VIN, Fuse, and MOSFET Diode
- Available in 14-Lead (4mm × 3mm) DFN, 16-Lead MS and SO Packages
Typical Application
Description
The LTC4355 is a positive voltage ideal diode-OR controller that drives two external N-channel MOSFETs. Forming the diode-OR with N-channel MOSFETs instead of Schottky diodes reduces power consumption, heat dissipation and PC board area.
With the LTC4355, power sources can easily be ORed together to increase total system reliability. The LTC4355 can diode-OR two positive supplies or the return paths of two negative supplies, such as in a –48V system.
In the forward direction the LTC4355 controls the voltage drop across the MOSFET to ensure smooth current transfer from one path to the other without oscillation. If a power source fails or is shorted, fast turnoff minimizes reverse current transients.
Power fault detection indicates if the input supplies are not in regulation, the inline fuses are blown, or the voltages across the MOSFETs are greater than the fault threshold.
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 |
|---|---|---|---|---|---|
| LTC4355CDE#PBF | 4x3 DFN-14 | DE | C | 05-08-1708 | Yes |
| LTC4355CDE#TRPBF | 4x3 DFN-14 | DE | C | 05-08-1708 | Yes |
| LTC4355CMS#PBF | MS-16 | MS | C | 05-08-1669 | Yes |
| LTC4355CMS#TRPBF | MS-16 | MS | C | 05-08-1669 | Yes |
| LTC4355CS#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC4355CS#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC4355HMS#PBF | MS-16 | MS | H | 05-08-1669 | Yes |
| LTC4355HMS#TRPBF | MS-16 | MS | H | 05-08-1669 | Yes |
| LTC4355IDE#PBF | 4x3 DFN-14 | DE | I | 05-08-1708 | Yes |
| LTC4355IDE#TRPBF | 4x3 DFN-14 | DE | I | 05-08-1708 | Yes |
| LTC4355IMS#PBF | MS-16 | MS | I | 05-08-1669 | Yes |
| LTC4355IMS#TRPBF | MS-16 | MS | I | 05-08-1669 | Yes |
| LTC4355IS#PBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LTC4355IS#TRPBF | SO-16 | S | I | 05-08-1610 (S16) | 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 | |
|---|---|---|---|---|---|---|
| LTC4355CDE#PBF | 4x3 DFN-14 | C | $3.55 | $2.50 | Yes | |
| LTC4355CDE#TRPBF | 4x3 DFN-14 | C | $2.60 | Yes | ||
| LTC4355CMS#PBF | MS-16 | C | $3.55 | $2.50 | Yes | |
| LTC4355CMS#TRPBF | MS-16 | C | $2.60 | Yes | ||
| LTC4355CS#PBF | SO-16 | C | $3.55 | $2.50 | Yes | |
| LTC4355CS#TRPBF | SO-16 | C | $2.60 | Yes | ||
| LTC4355HMS#PBF | MS-16 | H | $4.71 | $3.30 | Yes | |
| LTC4355HMS#TRPBF | MS-16 | H | $3.36 | Yes | ||
| LTC4355IDE#PBF | 4x3 DFN-14 | I | $4.30 | $3.00 | Yes | |
| LTC4355IDE#TRPBF | 4x3 DFN-14 | I | $3.10 | Yes | ||
| LTC4355IMS#PBF | MS-16 | I | $4.30 | $3.00 | Yes | |
| LTC4355IMS#TRPBF | MS-16 | I | $3.10 | Yes | ||
| LTC4355IS#PBF | SO-16 | I | $4.30 | $3.00 | Yes | |
| LTC4355IS#TRPBF | SO-16 | I | $3.10 | 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 |
|---|---|---|---|
| DC1066A | LTC4355 Demoboard: Positive High Voltage Ideal Diode-OR | $50.00 | |
| Buy Now | |||
Applications
- High Availability Systems
- AdvancedTCA® (ATCA) Systems
- +48V and –48V Distributed Power Systems
- Telecom Infrastructure
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Design Tools
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LTC4355
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.
