Packaging information
| Package | Pins VSSOP (DGS) | 10 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 3,500 | LARGE T&R |
Features for the LM3444
- Application Voltage Range: 80 VAC to 277 VAC
- Capable of Controlling LED Currents
Greater than 1 A - Adjustable Switching Frequency
- Low Quiescent Current
- Adaptive Programmable Off-Time Allows for
Constant Ripple Current - Thermal Shutdown
- No Flicker at 120 Hz
- Low-Profile 10-Pin VSSOP Package
or 8-Lead SOIC Package - Patented Drive Architecture
Description for the LM3444
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.