| Part No.： | LT8309 |
| Page： | 14 Pages |
| Size： | 566 KB |
| Manufacturer： | Linear Technology |
| Logo： |  |
| Views： | 0 |
| Update Time： | 2023-11-09 17:34:32 |
| DataSheet： | Download |
| Part No. | Packing | SPQ | Marking | MSL | Pins | Temp Range | Package Description | Buy |
| LT8309ES5#TRPBF | Reel | 2500 | LTGFZ | 1 | 5 | -40°C ~ 125°C | 5-Lead Plastic TSOT-23 | |
| LT8309ES5#TRMPBF | Reel | 500 | LTGFZ | 1 | 5 | -40°C ~ 125°C | 5-Lead Plastic TSOT-23 | |
| LT8309IS5#TRPBF | Reel | 2500 | LTGFZ | 1 | 5 | -40°C ~ 125°C | 5-Lead Plastic TSOT-23 | |
| LT8309IS5#TRMPBF | Reel | 500 | LTGFZ | 1 | 5 | -40°C ~ 125°C | 5-Lead Plastic TSOT-23 | |
| LT8309HS5#TRPBF | Reel | 2500 | LTGFZ | 1 | 5 | -40°C ~ 150°C | 5-Lead Plastic TSOT-23 | |
| LT8309HS5#TRMPBF | Reel | 500 | LTGFZ | 1 | 5 | -40°C ~ 150°C | 5-Lead Plastic TSOT-23 |
The LT8309 is a secondary-side synchronous rectifier driver that replaces the output rectifier diode in a flyback topology. By replacing the diode with a N-channel MOSFET, applications are no longer restricted by the heat constraints of the output diode. The IC replicates the behavior of a diode by sensing the drain-to-source voltage to determine when the current becomes negative. The LT8309's low minimum on- and off-times help improve noise immunity.
The fast propagation delay of 26ns allows applications to operate in discontinuous conduction mode (DCM) and critical conduction mode (CrCM). The gate driver features a 0.8Ω pull-down device for fast turn-offs. The 40V VCC rating allows the part to be driven from the output voltage or the rectified drain voltage of the MOSFET. A low quiescent current of 400μA maximizes efficiency at low output currents.
