The LM3405A is a 1-A constant current buck LED driver designed to provide a simple, high efficiency solution for driving high power LEDs. With a 0.205-V reference voltage feedback control to minimize power dissipation, an external resistor sets the current as needed for driving various types of LEDs. Switching frequency is internally set to 1.6 MHz, allowing small surface mount inductors and capacitors to be used. The LM3405A uses current-mode control and internal compensation offering ease of use and predictable, high performance regulation over a wide range of operating conditions. With a maximum input voltage of 22 V, the device can drive up to 5 High-Brightness LEDs in series at 1-A forward current, with the single LED forward voltage of approximately 3.7 V. Additional features include user accessible EN/DIM pin for enabling and PWM dimming of LEDs, thermal shutdown, cycle-by-cycle current limit and overcurrent protection.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM3405A 1.6-MHz, 1-A Constant Current Buck LED Driver With Internal Compensation in Tiny SOT and MSOP-PowerPAD™ Packages datasheet (Rev. D) | PDF | HTML | 19 Sep 2016 |
| White paper | Common LED Functions and LED Driver Design Considerations | 21 Sep 2020 | ||
| Application note | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | 03 May 2013 | ||
| User guide | AN-1685 LM3405A Demo Board (Rev. B) | 01 May 2013 | ||
| EVM User's guide | AN-1899 LM3405A eMSOP Evaluation Board (Rev. B) | 01 May 2013 | ||
| Application note | Powering & Dimming High-Brightness LEDs w/ LM3405 Constant-Current Buck Reg (Rev. A) | 01 May 2013 | ||
| Application note | AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) | 23 Apr 2013 | ||
| User guide | LM3405A Reference Design for MR16 LED Bulb, 600mA User Guide | 27 Jan 2012 |
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The LM3405A demo board is configured to drive a series string of high power, high brightness LEDs at a forward current of 1A using the LM3405A constant current buck regulator. The board can accept a full input operating range of 3V to 22V. The converter output voltage adjusts as needed to maintain (...)
LM3405A is a 1A constant current buck LED driver designed to provide a simple high efficiency solution for driving high power LEDs. With a 0.205V reference voltage feedback control to minimize power dissipation, an external resistor sets the current as needed for driving various types of LEDs. (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HVSSOP (DGN) | 8 | Ultra Librarian |
| SOT-23-THN (DDC) | 6 | Ultra Librarian |
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