Maxim Integrated Products MAX16824 and MAX16825: Three-channel LED drivers provide independent-channel PWM dimming

The high-voltage, high-brightness MAX16824 and MAX16825 three-channel LED drivers allow independent-channel PWM (pulse-width-modulation) dimming and LED current adjustment. Features include a 6.5 to 28V input-voltage range and three 36V-rated, open-drain, constant-current sink outputs delivering as much as 150 mA to three strings of high-brightness LEDs. The ICs allow independent LED-current setting for each channel. The MAX16824 provides three PWM dimming inputs, allows independent control of the brightness of each string of LEDs, and allows the switching of each string on or off. The MAX16825 features a 3-bit transparent latch; a 3-bit shift register; and a 3-Mbps, four-wire serial interface. The serial interface allows the control of output channels through an external microcontroller and allows cascading of MAX16825 drivers for combined operation. The device provides a 5V regulated output with a 4-mA output-current capability and thermal shutdown in the event of overheating. Available in a 4×4-mm TSSOP-16 package with an exposed pad, the MAX16824 and MAX16825 LED drivers cost 91 cents each (1000).

Maxim Integrated Products, www.maxim-ic.com