DocumentationDatasheet
Design Note
Reliability Data
Product Selector Card
LT Journal
- Avoid Debugging Cycles in Power Management for FPGA, GPU and ASIC Systems
- Low IQ Ideal Diode Controller with Reverse Input Protection for Automotive and Telecom Power Solutions
- Mar 2008 - 9V to 80V Ideal Diode Reduces Heat Dissipation by Order of Magnitude over Schottky
Press Release
- High Voltage Ideal Diode-OR Controller Provides Higher Efficiency & Smooth
- Proven Power Solutions for Altera Arria 10 FPGA
- Wide Operating Range Ideal Diode Controller Provides Negative Input Protection & Low Current Operation
cad_symbol
ltspice
Features
- Reduces Power Dissipation by Replacing a Power Schottky Diode with an N-Channel MOSFET
- 0.5μs Turn-Off Time Limits Peak Fault Current
- Wide Operating Voltage Range: 9V to 80V
- Smooth Switchover without Oscillation
- No Reverse DC Current
- Available in 6-Lead (2mm × 3mm) DFN and 8-Lead MSOP Packages
Typical Application
Description
The LTC®4357 is a positive high voltage ideal diode controller that drives an external N-channel MOSFET to replace a Schottky diode. When used in diode-OR and high current diode applications, the LTC4357 reduces power consumption, heat dissipation, voltage loss and PC board area.
The LTC4357 easily ORs power sources to increase total system reliability. In diode-OR applications, the LTC4357 controls the forward voltage drop across the MOSFET to ensure smooth current transfer from one path to the other without oscillation. If the power source fails or is shorted, a fast turn-off minimizes reverse current transients.
2x3 DFN-6,MS-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC4357CDCB#PBF | DFN | 6 | C | $2.43 | |
| LTC4357CDCB#TRMPBF | DFN | 6 | C | $2.43 | $1.75 |
| LTC4357CDCB#TRPBF | DFN | 6 | C | $2.43 | $1.70 |
| LTC4357CMS8#PBF | MSOP | 8 | C | $2.43 | $1.70 |
| LTC4357CMS8#TRPBF | MSOP | 8 | C | $1.75 | |
| LTC4357HDCB#PBF | DFN | 6 | H | $3.36 | |
| LTC4357HDCB#TRMPBF | DFN | 6 | H | $3.36 | $2.40 |
| LTC4357HDCB#TRPBF | DFN | 6 | H | $3.36 | $2.35 |
| LTC4357HMS8#PBF | MSOP | 8 | H | $3.36 | $2.35 |
| LTC4357HMS8#TRPBF | MSOP | 8 | H | $2.41 | |
| LTC4357IDCB#PBF | DFN | 6 | I | $2.91 | |
| LTC4357IDCB#TRMPBF | DFN | 6 | I | $2.91 | $2.09 |
| LTC4357IDCB#TRPBF | DFN | 6 | I | $2.91 | $2.04 |
| LTC4357IMS8#PBF | MSOP | 8 | I | $2.91 | $2.04 |
| LTC4357IMS8#TRPBF | MSOP | 8 | I | $2.09 | |
| LTC4357MPMS8 | MSOP | 8 | MP | $7.29 | $5.10 |
| LTC4357MPMS8#PBF | MSOP | 8 | MP | $7.29 | $5.10 |
| LTC4357MPMS8#TR | MSOP | 8 | MP | $5.16 | |
| LTC4357MPMS8#TRPBF | MSOP | 8 | MP | $5.16 |
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 |
|---|---|---|---|
| DC1203A | LTC4357 Positive High Voltage Ideal Diode Controller | $50.00 |