High-Voltage, Three-Channel Linear High-Brightness LED Drivers

The MAX16824/MAX16825 three-channel LED drivers operate over a 6.5V to 28V input voltage range. These devices provide three open-drain constant-current-sinking outputs that are rated to 36V and deliver up to 150mA of current to each string of high-brightness LEDs (HB LEDs). The current at each output is programmable by means of an external current-sense resistor. The MAX16824 features three PWM inputs that control the duty cycle of the output current, allowing a wide LED dimming range to be implemented. The PWM inputs also function as on/off control for each corresponding output. The MAX16825 offers a 4-wire serial interface, a 3-bit shift register, and a 3-bit transparent latch. The serial interface allows a microcontroller to configure the output channels using four inputs (DIN, CLK, LE, active-low OE) and a data output (DOUT). DOUT allows multiple drivers to be cascaded and operated together.

The MAX16824/MAX16825's on-board pass elements minimize the need for external components, while at the same time, providing ±5% LED current accuracy. Additional features include a +5V (±5%) regulated output with 4mA output current capability and thermal protection.

The MAX16824/MAX16825 are available in a thermally enhanced 16-pin TSSOP-EP package and specified over the -40°C to +125°C temperature range.

Applications

* Architectural and Decorative Lighting * Automotive Lighting * Indoor and Outdoor LED Video Displays * Industrial Lighting * LCD Display Backlighting * Mood Lighting

* 6.5V to 28V Operating Range

* Outputs Connected to 36V Supply for Long LED Strings

* Three 36V-Rated Output Channels with Independently Adjustable LED Current

* 150mA Output Current Per Channel

* ±5% LED Current Accuracy

* PWM Dimming

* Three Independent Dimming Control Inputs (MAX16824)

* 4-Wire Serial Interface LED Current Chopping (MAX16825)

* +5V (±5%) Regulated Output with 4mA Source Capability

* Fast Transient Dimming Response

* 200mV Current-Sense Reference Reduces Power Loss

* Thermal Shutdown

* -40°C to +125°C Operating Temperature Range

* Thermally Enhanced, 16-Pin TSSOP Exposed Paddle Package