Ultrahigh Efficiency White LED Drives

March 14, 2003
The MAX1984/MAX1985/MAX1986 white light-emitting diode (LED) drivers with individual regulators control the current of up to eight LEDs. Highly efficient
The MAX1984/MAX1985/MAX1986 white light-emitting diode (LED) drivers with individual regulators control the current of up to eight LEDs. Highly efficient (>95%) step-up regulators generate adequate voltage levels to keep all the current regulators in regulation. This results in over 90% LED drive efficiency.

The MAX1984/MAX1985/MAX1986 drive up to eight, six, and four LEDs, respectively. Each device has an LED select pin (SEL), which allows one of two subsets or all LEDs to be illuminated. The individual current regulators improve current matching between LEDs; open or shorted LEDs cannot affect the performance of other LEDs. The step-up regulators achieve high efficiency by using synchronous rectification. The internal N-channel switch and P-channel synchronous rectifier eliminate the need for external MOSFETs and diodes. The 1 MHz switching frequency allows for low-profile inductors and ceramic capacitors.

A versatile dimming interface accommodates analog, digitally adjusted pulse-width modulation (DPWM), and parallel control. Brightness is adjusted using a multi-mode dimming interface through a DPWM signal, a 2- or 3-bit parallel control interface, or an analog signal. If frequency is 10 kHz or above, the DPWM signal can be connected directly to the control pin without an external RC filter. These devices are available in a 4 mm x 4 mm thin QFN package.

A preliminary data sheet for this product is available from Maxim at www.maxim-ic.com/PRGraphics/PRPDF/MAX1984DS.pdf.

Sponsored Recommendations

What are the Important Considerations when Assessing Cobot Safety?

April 16, 2024
A review of the requirements of ISO/TS 15066 and how they fit in with ISO 10218-1 and 10218-2 a consideration the complexities of collaboration.

Wire & Cable Cutting Digi-Spool® Service

April 16, 2024
Explore DigiKey’s Digi-Spool® professional cutting service for efficient and precise wire and cable management. Custom-cut to your exact specifications for a variety of cable ...

DigiKey Factory Tomorrow Season 3: Sustainable Manufacturing

April 16, 2024
Industry 4.0 is helping manufacturers develop and integrate technologies such as AI, edge computing and connectivity for the factories of tomorrow. Learn more at DigiKey today...

Connectivity – The Backbone of Sustainable Automation

April 16, 2024
Advanced interfaces for signals, data, and electrical power are essential. They help save resources and costs when networking production equipment.

Comments

To join the conversation, and become an exclusive member of Electronic Design, create an account today!