Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX1984, MAX1985 and MAX1986
Edited by the Electronicstalk Editorial
Team on 06 March 2003
High-efficiency drivers run up to eight
white LEDs
The MAX1984, MAX1985 and MAX1986 are white LED drivers with individual regulators that control the current of up to eight LEDs.
The MAX1984, MAX1985 and MAX1986 are white LED drivers with individual regulators that control the current of up to eight LEDs Highly efficient (95% minimum) step-up regulators generate adequate voltage levels to keep all the current regulators in regulation
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX1984, MAX1985 and 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 1MHz switching frequency allows for low-profile inductors and ceramic capacitors.
A versatile dimming interface accommodates analogue, digitally adjusted pulsewidth modulation (DPWM), and parallel control.
Brightness is adjusted using a multimode dimming interface through a DPWM signal, a 2 or 3bit parallel control interface, or an analogue signal.
If frequency is 10kHz or above, the DPWM signal can be connected directly to the control pin without an external RC filter.
These devices are available in 4 x 4mm thin QFN packages.
Prices for the MAX1984, MAX1985 and MAX1986 start at $1.80, $1.71 and $1.63, respectively (1000-up, FOB USA).
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