The LM3409, LM3409-Q1, LM3409HV, and LM3409HV-Q1 are P-channel MOSFET (PFET) controllers for step-down (buck) current regulators. They offer wide input voltage range, high-side differential current sense with low adjustable threshold voltage and fast output enable/disable function and a thermally enhanced 10-pin, HVSSOP package. These features combine to make the LM3409 family of devices ideal for use as constant current sources for driving LEDs where forward currents up to 5 A are easily achievable.
The LM3409 devices use constant off-time (COFT) control to regulate an accurate constant current without the need for external control loop compensation. Analog and PWM dimming are easy to implement and result in a highly linear dimming range with excellent achievable contrast ratios. Programmable UVLO, low-power shutdown, and thermal shutdown complete the feature set.
For all available packages, see the orderable addendum at the end of the data sheet.| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | LM3409, -Q1, LM3409HV, -Q1 P-FET Buck Controller for High-Power LED Drivers datasheet (Rev. L) | PDF | HTML | May 23, 2016 |
| White paper | LED Drivers for Automotive Exterior Applications (Rev. B) | Mar 27, 2018 | ||
| Application note | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | May 3, 2013 | ||
| User guide | AN-1954 LM3409 Demonstration Board (Rev. D) | May 1, 2013 | ||
| Application note | AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) | Apr 23, 2013 | ||
| Application note | Dimming Techniques for Switched-Mode LED Drivers | Jul 30, 2009 |
For additional terms or required resources, click any title below to view the detail page where available.
This demonstration board showcases the LM3409 PFET controller for a buck current regulator. It is designed to drive 4 LEDs (VO = 15V) at a maximum average LED current (ILED = 1A) from a DC input voltage (VIN = 24V). The switching frequency (fSW = 525 kHz) is targeted for the nominal operating (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HVSSOP (DGQ) | 10 | Ultra Librarian |
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