The MAX16809/MAX16810 are integrated, high-efficiency
white or RGB LED drivers. They are designed for
LCD backlighting and other LED lighting applications
with multiple strings of LEDs. The MAX16809/MAX16810's current-mode PWM controller regulates the necessary voltage to the LED array. Depending on
the input voltage and LED voltage range, it can be
used with boost or buck-boost (SEPIC) topologies.
The MAX16809/MAX16810 LED drivers include 16
open-drain, constant-current-sinking LED driver outputs
rated for 36V continuous operation. The LED current-control
circuitry achieves ±3% current matching among
strings and enables paralleling of outputs for LED string
currents higher than 55mA. The output-enable pin is
used for simultaneous PWM dimming of all output channels.
Dimming frequency range is 50Hz to 30kHz and
dimming ratio is up to 5000:1. The constant-current outputs
are single resistor programmable and the LED current
can be adjusted up to 55mA per output channel.
The MAX16809/MAX16810 operate either in stand-alone
mode or with a microcontroller (µC) using an industry-standard,
4-wire serial interface. The MAX16810 includes
a watchdog and circuitry that automatically detects
open-circuit LEDs.
The MAX16809/MAX16810 include overtemperature protection,
operate over the full -40°C to +125°C temperature
range, and are available in a 5mm x 7mm thermally enhanced, 38-pin TQFN exposed paddle package.
MAX16809
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