The LM3444 is an adaptive constant off-time AC/DC buck (step-down) constant current controller that provides a constant current for illuminating high power LEDs. The high-frequency capable architecture allows the use of small external passive components. A passive PFC circuit ensures good power factor by drawing current directly from the line for most of the cycle, and provides a constant positive voltage to the buck regulator. Additional features include thermal shutdown, current limit and VCC undervoltage lockout. The LM3444 is available in a low profile 10-pin VSSOP package or an 8-lead SOIC package.
| Input voltage type | AC/DC |
| Topology | Buck, Flyback |
| Vin (min) (V) | 8 |
| Vin (max) (V) | 13 |
| Vout (max) (V) | 60 |
| Vout (min) (V) | 9 |
| Iout (max) (A) | 2 |
| Iq (typ) (mA) | 1.58 |
| Features | Adjustable Switch Frequency, Thermal shutdown |
| Operating temperature range (°C) | -40 to 125 |
| Dimming method | Analog |
| Number of channels | 1 |
| Rating | Catalog |
| SOIC (D) | 8 | 29.4 mm² 4.9 x 6 |
| VSSOP (DGS) | 10 | 14.7 mm² 3 x 4.9 |
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