LTC4352 - Low Voltage Ideal Diode Controller with Monitoring
Features
- Low Loss Replacement for Power Diode
- Controls N-Channel MOSFET
- 0V to 18V Supply ORing or Holdup
- 0.5μs Turn-On and Turn-Off Time
- Undervoltage and Overvoltage Protection
- Open MOSFET Detect
- Status and Fault Outputs
- Hot Swappable
- Reverse Current Enable Input
- 12-Pin MSOP and DFN (3mm × 3mm) Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC4352 creates a near-ideal diode using an external N-channel MOSFET. It replaces a high power Schottky diode and the associated heat sink, saving power and board area. The ideal diode function permits low loss power ORing and supply holdup applications.The LTC4352 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 switch-over. If the input supply fails or is shorted, a fast turn-off minimizes reverse currents.
The controller operates with supplies from 2.9V to 18V. For lower voltages, an external supply is needed at the VCC pin. Power passage is disabled during undervoltage or overvoltage conditions. The controller also features an open MOSFET detect circuit that flags excessive voltage drop across the pass transistor in the on state. A REV pin enables reverse current, overriding the diode behavior when desired.
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 |
|---|---|---|---|---|---|
| LTC4352CDD#PBF | 3x3 DFN-12 | DD | C | 05-08-1725 | Yes |
| LTC4352CDD#TRPBF | 3x3 DFN-12 | DD | C | 05-08-1725 | Yes |
| LTC4352CMS#PBF | MS-12 | MS | C | 05-08-1668 | Yes |
| LTC4352CMS#TRPBF | MS-12 | MS | C | 05-08-1668 | Yes |
| LTC4352HDD#PBF | 3x3 DFN-12 | DD | H | 05-08-1725 | Yes |
| LTC4352HDD#TRPBF | 3x3 DFN-12 | DD | H | 05-08-1725 | Yes |
| LTC4352HMS#PBF | MS-12 | MS | H | 05-08-1668 | Yes |
| LTC4352HMS#TRPBF | MS-12 | MS | H | 05-08-1668 | Yes |
| LTC4352IDD#PBF | 3x3 DFN-12 | DD | I | 05-08-1725 | Yes |
| LTC4352IDD#TRPBF | 3x3 DFN-12 | DD | I | 05-08-1725 | Yes |
| LTC4352IMS#PBF | MS-12 | MS | I | 05-08-1668 | Yes |
| LTC4352IMS#TRPBF | MS-12 | MS | I | 05-08-1668 | 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 | |
|---|---|---|---|---|---|---|
| LTC4352CDD#PBF | 3x3 DFN-12 | C | $3.57 | $2.50 | Yes | |
| LTC4352CDD#TRPBF | 3x3 DFN-12 | C | $2.56 | Yes | ||
| LTC4352CMS#PBF | MS-12 | C | $3.57 | $2.50 | Yes | |
| LTC4352CMS#TRPBF | MS-12 | C | $2.56 | Yes | ||
| LTC4352HDD#PBF | 3x3 DFN-12 | H | $4.77 | $3.34 | Yes | |
| LTC4352HDD#TRPBF | 3x3 DFN-12 | H | $3.40 | Yes | ||
| LTC4352HMS#PBF | MS-12 | H | $4.77 | $3.34 | Yes | |
| LTC4352HMS#TRPBF | MS-12 | H | $3.40 | Yes | ||
| LTC4352IDD#PBF | 3x3 DFN-12 | I | $4.14 | $2.90 | Yes | |
| LTC4352IDD#TRPBF | 3x3 DFN-12 | I | $2.96 | Yes | ||
| LTC4352IMS#PBF | MS-12 | I | $4.14 | $2.90 | Yes | |
| LTC4352IMS#TRPBF | MS-12 | 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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1329A | LTC4352 Low Voltage Ideal Diode Controller with Monitoring, LT4351 Replacement | $50.00 | |
| Buy Now | |||
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 | |
|---|---|---|---|---|---|---|
| LTC4352HDD#PBF | 3x3 DFN-12 | H | $4.77 | $3.34 | Yes | |
| LTC4352HDD#TRPBF | 3x3 DFN-12 | H | $3.40 | Yes | ||
| LTC4352HMS#PBF | MS-12 | H | $4.77 | $3.34 | Yes | |
| LTC4352HMS#TRPBF | MS-12 | H | $3.40 | Yes | ||
| LTC4352IDD#PBF | 3x3 DFN-12 | I | $4.14 | $2.90 | Yes | |
| LTC4352IDD#TRPBF | 3x3 DFN-12 | I | $2.96 | Yes | ||
| LTC4352IMS#PBF | MS-12 | I | $4.14 | $2.90 | Yes | |
| LTC4352IMS#TRPBF | MS-12 | I | $2.96 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Redundant Power Supplies
- Supply Holdup
- Telecom Infrastructure
- Computer Systems and Servers
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Design Tools
LTspice
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Models for the following parts are available in LTspice:
LTC4352
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.
