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Design Note
Reliability Data
Product Selector Card
LT Journal
Press Release
- 9V to 72V Ideal Diode Bridge Controller Now Specified from -55°C to 125°C for Military & Automotive Applications
- Ideal Diode Bridge Controller Minimizes Rectifier Heat & Voltage Loss
- Low Loss 3-Phase Ideal Diode Bridge Rectifier Reduces Heat, Easing Thermal Design
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Video
- LT4320 - Ideal Diode Bridge vs Schottky Diode Bridge
- LT4320 -Reducing AC/DC Rectifier Size and Cost with an LT4320 Ideal Diode Bridge
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Features
- Maximizes Power Efficiency
- Eliminates Thermal Design Problems
- DC to 600Hz
- 9V to 72V Operating Voltage Range
- IQ = 1.5mA (Typical)
- Maximizes Available Voltage
- Available in 8-Lead (3mm × 3mm) DFN, 12-Lead MSOP and 8-Lead PDIP Packages
Typical Application
Description
The LT®4320/LT4320-1 are ideal diode bridge controllers that drive four N-channel MOSFETs, supporting voltage rectification from DC to 600Hz typical. By maximizing available voltage and reducing power dissipation (see thermograph comparison below), the ideal diode bridge simplifies power supply design and reduces power supply cost, especially in low voltage applications.
An ideal diode bridge also eliminates thermal design problems, costly heat sinks, and greatly reduces PC board area. The LT4320’s internal charge pump supports an all- NMOS design, which eliminates larger and more costly PMOS switches. If the power source fails or is shorted, a fast turn-off minimizes reverse current transients.
The LT4320 is designed for DC to 60Hz typical voltage rectification, while the LT4320-1 is designed for DC to 600Hz typical voltage rectification. Higher frequencies of operation are possible depending on MOSFET size and operating load current.
3x3 DFN-8,MS-12E,N-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT4320HDD#PBF | DFN | 8 | H | $4.93 | $3.45 |
| LT4320HDD#TRPBF | DFN | 8 | H | $4.99 | $3.51 |
| LT4320HDD-1#PBF | DFN | 8 | H | $5.36 | $3.75 |
| LT4320HDD-1#TRPBF | DFN | 8 | H | $5.42 | $3.81 |
| LT4320HMSE#PBF | MSOP | 12 | H | $4.93 | $3.45 |
| LT4320HMSE#TRPBF | MSOP | 12 | H | $4.99 | $3.51 |
| LT4320HMSE-1#PBF | MSOP | 12 | H | $5.36 | $3.75 |
| LT4320HMSE-1#TRPBF | MSOP | 12 | H | $5.42 | $3.81 |
| LT4320HN8#PBF | PDIP | 8 | H | $6.10 | $4.27 |
| LT4320HN8-1#PBF | PDIP | 8 | H | $6.51 | $4.56 |
| LT4320IDD#PBF | DFN | 8 | I | $4.21 | $2.95 |
| LT4320IDD#TRPBF | DFN | 8 | I | $3.01 | |
| LT4320IDD-1#PBF | DFN | 8 | I | $4.64 | $3.25 |
| LT4320IDD-1#TRPBF | DFN | 8 | I | $3.31 | |
| LT4320IMSE#PBF | MSOP | 12 | I | $4.21 | $2.95 |
| LT4320IMSE#TRPBF | MSOP | 12 | I | $3.01 | |
| LT4320IMSE-1#PBF | MSOP | 12 | I | $4.64 | $3.25 |
| LT4320IMSE-1#TRPBF | MSOP | 12 | I | $3.31 | |
| LT4320IN8#PBF | PDIP | 8 | I | $5.21 | $3.65 |
| LT4320IN8-1#PBF | PDIP | 8 | I | $5.64 | $3.95 |
| LT4320MPMSE#PBF | MSOP | 12 | MP | $12.64 | $8.85 |
| LT4320MPMSE#TRPBF | MSOP | 12 | MP | $12.70 | $8.91 |
| LT4320MPMSE-1#PBF | MSOP | 12 | MP | $13.93 | $9.75 |
| LT4320MPMSE-1#TRPBF | MSOP | 12 | MP | $13.99 | $9.81 |
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 |
|---|---|---|---|
| DC1823B | LT4320IDD Demo Board | 1.2kW Ideal Diode Bridge Full-Wave Rectifier [9V to 40V, 30A] | $75.00 | |
| DC1902B | LT4320IDD Demo Board | 200W Ideal Diode Bridge Full-Wave Rectifier [9V to 60V, 3.5A] | $75.00 | |
| DC2047A-A | LT4276B/LT4321 Demo Board | PoE+ (25W, 12V/1.9A) PD with DC/DC, Ideal Diode Bridge and 9V-57V AUX | $95.00 | |
| DC2465A | LT4320IDD-1 3-Phase Ideal Diode Bridge Rectifier [9VAC to 48VAC L-L, 25A] | $125.00 |