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| Part Number | LM2577T-12 | LM2587T-12 | LM2577T-15 | LM2576T-12 | LM2577M-12 | LM2577N-12 | LM2577S-12 |
|---|---|---|---|---|---|---|---|
| Manufacturer | National Semiconductor | National Semiconductor | Texas Instruments | National Semiconductor | Texas Instruments | National Semiconductor | Texas Instruments |
| Product Status | Obsolete | Active | Obsolete | Active | Obsolete | Active | Obsolete |
| Function | Step-Up, Step-Up/Step-Down | Step-Up, Step-Up/Step-Down | Step-Up, Step-Up/Step-Down | Step-Down | Step-Up, Step-Up/Step-Down | - | Step-Up, Step-Up/Step-Down |
| Output Configuration | Positive or Negative | Positive | Positive | Positive | Positive or Negative | - | Positive or Negative |
| Topology | Boost, Flyback, Forward Converter | Boost, Flyback, Forward Converter | Boost, Flyback, Forward Converter | Buck | Boost, Flyback, Forward Converter | - | Boost, Flyback, Forward Converter |
| Output Type | Fixed | Fixed | Fixed | Fixed | Fixed | - | Fixed |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | - | 1 |
| Voltage - Input (Min) | 3.5V | 4V | 3.5V | 4V | 3.5V | - | 3.5V |
| Voltage - Input (Max) | 40V | 40V | 40V | 40V | 40V | - | 40V |
| Voltage - Output (Min/Fixed) | 12V | 12V | 15V | 12V | 12V | - | 12V |
| Voltage - Output (Max) | - | - | - | - | - | - | - |
| Current - Output | 3A (Switch) | 5A (Switch) | 3A (Switch) | 3A | 3A (Switch) | - | 3A (Switch) |
| Frequency - Switching | 52kHz | 100kHz | 52kHz | 52kHz | 52kHz | - | 52kHz |
| Synchronous Rectifier | 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) |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole | Surface Mount | - | Surface Mount |
| Package / Case | TO-220-5 | TO-220-5 Formed Leads | TO-220-5 | TO-220-5 | 24-SOIC (0.295", 7.50mm Width) | - | TO-263-6, D²Pak (5 Leads + Tab), TO-263BA |
| Supplier Device Package | TO-220-5 | TO-220-5 | TO-220-5 | TO-220-5 | 24-SOIC | - | DDPAK/TO-263-5 |
