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| Part Number | LM2647MTC/NOPB | LM2657MTC/NOPB | LM2747MTC/NOPB | LM2647MTCX/NOPB |
|---|---|---|---|---|
| Manufacturer | National Semiconductor | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Status | Active | Active | Active | Active |
| Output Type | Transistor Driver | Transistor Driver | Transistor Driver | Transistor Driver |
| Function | Step-Down | Step-Down | Step-Down | Step-Down |
| Output Configuration | Positive | Positive | Positive | Positive |
| Topology | Buck | Buck | Buck | Buck |
| Number of Outputs | 2 | 2 | 1 | 2 |
| Output Phases | 2 | 2 | 1 | 2 |
| Voltage - Supply (Vcc/Vdd) | 5.5V ~ 28V | 4.5V ~ 28V | 3V ~ 6V | 5.5V ~ 28V |
| Frequency - Switching | 200kHz ~ 500kHz | 200kHz ~ 500kHz | 50kHz ~ 1MHz | 200kHz ~ 500kHz |
| Duty Cycle (Max) | 75% | 70% | 86% | 75% |
| Synchronous Rectifier | Yes | Yes | Yes | Yes |
| Clock Sync | No | No | No | No |
| Serial Interfaces | - | - | - | - |
| Control Features | Current Limit, Enable, Frequency Control, Power Good, Soft Start | Current Limit, Enable, Frequency Control, Power Good, Soft Start | Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking | Current Limit, Enable, Frequency Control, Power Good, Soft Start |
| Operating Temperature | -5°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -5°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 28-TSSOP (0.173", 4.40mm Width) | 28-TSSOP (0.173", 4.40mm Width) | 14-TSSOP (0.173", 4.40mm Width) | 28-TSSOP (0.173", 4.40mm Width) |
| Supplier Device Package | 28-TSSOP | 28-TSSOP | 14-TSSOP | 28-TSSOP |
