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| Part Number | L5991A | L5991AD | L5994A |
|---|---|---|---|
| Manufacturer | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Product Status | Obsolete | Active | Obsolete |
| Output Type | Transistor Driver | Transistor Driver | Transistor Driver |
| Function | Step-Up/Step-Down | Step-Up/Step-Down | Step-Down |
| Output Configuration | Positive, Isolation Capable | Positive, Isolation Capable | Positive |
| Topology | Flyback | Flyback | Buck |
| Number of Outputs | 1 | 1 | 3 |
| Output Phases | 1 | 1 | 1 |
| Voltage - Supply (Vcc/Vdd) | 7.6V ~ 20V | 7.6V ~ 20V | 4.75V ~ 25V |
| Frequency - Switching | Up to 1MHz | Up to 1MHz | 200kHz, 300kHz |
| Duty Cycle (Max) | 93% | 93% | - |
| Synchronous Rectifier | Yes | Yes | Yes |
| Clock Sync | No | No | No |
| Serial Interfaces | - | - | - |
| Control Features | Current Limit, Frequency Control, Soft Start | Current Limit, Frequency Control, Soft Start | Enable, Frequency Control, Power Good, Soft Start |
| Operating Temperature | -40°C ~ 150°C (TJ) | -40°C ~ 150°C (TJ) | -40°C ~ 140°C (TJ) |
| Mounting Type | Through Hole | Surface Mount | Surface Mount |
| Package / Case | 16-DIP (0.300", 7.62mm) | 16-SOIC (0.154", 3.90mm Width) | 32-LQFP |
| Supplier Device Package | 16-DIP | 16-SO | 32-TQFP (7x7) |
