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| Part Number | LM2678SX-ADJ | LM2679SX-ADJ | LM2676SX-ADJ | LM2677SX-ADJ | LM2678S-ADJ | LM2678SD-ADJ | LM2678SDX-ADJ |
|---|---|---|---|---|---|---|---|
| Manufacturer | National Semiconductor | Texas Instruments | Texas Instruments | National Semiconductor | Texas Instruments | National Semiconductor | Texas Instruments |
| Product Status | Active | Not For New Designs | Not For New Designs | Active | Not For New Designs | Active | Obsolete |
| Function | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down | Step-Down |
| Output Configuration | Positive | Positive | Positive | Positive | Positive | Positive | Positive |
| Topology | Buck | Buck | Buck | Buck | Buck | Buck | Buck |
| Output Type | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable | Adjustable |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage - Input (Min) | 8V | 8V | 8V | 8V | 8V | 8V | 8V |
| Voltage - Input (Max) | 40V | 40V | 40V | 40V | 40V | 40V | 40V |
| Voltage - Output (Min/Fixed) | 1.21V | 1.21V | 1.2V | 1.21V | 1.21V | 1.21V | 1.21V |
| Voltage - Output (Max) | 37V | 37V | 37V | 37V | 37V | 37V | 37V |
| Current - Output | 5A | 5A | 3A | 5A | 5A | 5A | 5A |
| Frequency - Switching | 260kHz | 260kHz | 260kHz | 260kHz | 260kHz | 260kHz | 260kHz |
| Synchronous Rectifier | No | No | No | No | No | No | No |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | TO-263-8, D²Pak (7 Leads + Tab), TO-263CA | TO-263-8, D²Pak (7 Leads + Tab), TO-263CA | TO-263-8, D²Pak (7 Leads + Tab), TO-263CA | TO-263-8, D²Pak (7 Leads + Tab), TO-263CA | TO-263-8, D²Pak (7 Leads + Tab), TO-263CA | 14-VDFN Exposed Pad | 14-VDFN Exposed Pad |
| Supplier Device Package | DDPAK/TO-263-7 | DDPAK/TO-263-7 | DDPAK/TO-263-7 | DDPAK/TO-263-7 | DDPAK/TO-263-7 | 14-VSON (5x6) | 14-VSON (5x6) |
