The LM3508 is a synchronous boost converter designed to drive up to 4 series white LEDs with a constant current of up to 30mA from a single-cell Li-Ion battery. It eliminates the need for an external Schottky diode and features an 850kHz switching frequency, over-voltage protection, and internal soft-start to eliminate in-rush current. The device also includes advanced short-circuit protection and true shutdown isolation to prevent leakage current through the LEDs.
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Texas Instruments LM3508 technical specifications.
| Number of Channels | 1 |
| Input Voltage (Min) | 2.7V |
| Input Voltage (Max) | 5.5V |
| Output Voltage (Max) | 17.5V |
| LED Current per Channel | 30mA |
| Switching Frequency | 850kHz |
| Peak Efficiency | 85% |
| Topology | Boost |
| Operating Temperature Range | -30 to 85°C |
| RoHS | Compliant |
| REACH | Affected |
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