| PartNumber | LT1681ESW#PBF | LT1681ESW#TRPBF | LT1681ISW#PBF |
| Description | Switching Voltage Regulators Primary Sync. Forward Sw Controller | Switching Voltage Regulators Primary Sync. Forward Sw Controller | Switching Voltage Regulators Primary Sync. Forward Sw Controller |
| Manufacturer | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Product Category | Switching Voltage Regulators | Switching Voltage Regulators | Switching Voltage Regulators |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | SO-20 | SO-20 | SO-20 |
| Output Voltage | 1.25 V to 64.8 V | 1.25 V to 64.8 V | - |
| Output Current | 20 A | 20 A | 20 A |
| Number of Outputs | 1 Output | 1 Output | 1 Output |
| Input Voltage MAX | 72 V | 72 V | 72 V |
| Topology | Flyback | Flyback | Forward |
| Input Voltage MIN | 9 V | 9 V | 9 V |
| Switching Frequency | 350 kHz | 350 kHz | 350 kHz |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Series | LT1681 | LT1681 | LT1681 |
| Packaging | Tube | Reel | Tube |
| Input Voltage | 9 V to 72 V | 9 V to 72 V | 9 V to 72 V |
| Operating Temperature Range | - 40 C to + 85 C | - 40 C to + 85 C | - 40 C to + 85 C |
| Type | Dual Transistor Synchronous Forward Controller | Dual Transistor Synchronous Forward Controller | - |
| Brand | Analog Devices / Linear Technology | Analog Devices / Linear Technology | Analog Devices / Linear Technology |
| Shutdown | Shutdown | Shutdown | Shutdown |
| Operating Supply Current | 17 mA | 17 mA | 17 mA |
| Product Type | Switching Voltage Regulators | Switching Voltage Regulators | Switching Voltage Regulators |
| Factory Pack Quantity | 38 | 1000 | 38 |
| Subcategory | PMIC - Power Management ICs | PMIC - Power Management ICs | PMIC - Power Management ICs |
| Supply Voltage Min | 9 V | 9 V | 9 V |