Sunnyvale, Calif. Maxim Integrated Products has introduced 3-channel, high-brightness (HB) LED drivers that feature three 36-V rated, open-drain, constant-current sink outputs capable of delivering up to 150 mA to three separate strings of HB LEDs.
The high-voltage MAX16824 and MAX16825 LED drivers deliver a 6.5-V to 28-V input voltage range.
For optimal design flexibility, the MAX16824 and MAX16825 devices allow independent LED current setting of each channel. To implement this functionality, the MAX16824 provides three PWM dimming inputs to independently control the brightness of each string of LEDs and switch each string on or off. Conversely, the MAX16825 features a 3-bit transparent latch, a 3-bit shift register, and a 2 Mbits/s, 4-wire serial interface. The serial interface allows all output channels to be controlled through an external microcontroller, and it also enables multiple MAX16825 drivers to be cascaded and operated together.
The MAX16824/MAX16825 devices integrate a pass element with a low dropout voltage, which eliminates the need for an external power transistor. Providing +/-5% accuracy LED current control, each of the three pass elements ensures brightness matching while reducing the size, complexity, and cost of the total driver solution, said Maxim.
The devices also provide an additional +5-V regulated output with 4 mA output current capability and thermal shutdown in the event of overheating. Both devices are available in a thermally enhanced, 4 x 4-mm, 16-pin TSSOP package with exposed pad. These LED drivers are suitable for a wide range of applications including industrial, architectural, decorative lighting, indoor/outdoor LED video displays, automotive interior lighting, and LCD backlighting.
Pricing: Starts at $0.91 (1000-up, FOB USA).
Maxim Integrated Products, 1-800-998-8800, www.maxim-ic.com