MAX16809

The MAX16809 is an integrated, high-efficiency white or RGB LED driver. It is designed for LCD backlighting and other LED lighting applications with multiple strings of LEDs. The MAX16809's current-mode PWM controller regulates the necessary voltage to the LED array.Depending on the input voltage and LED voltage range, this device can be used with boost or buckboost (SEPIC) topologies.

Features of the MAX16809 are:(1)16 constant-current output channels (up to 55mA each); (2)paralleling channels allows higher current per LED string; (3)outputs rated for 36V continuous voltage; (4)output-enable pin for pwm dimming (up to 30kHz); (5)one resistor sets LED current for all channels; (6)wide dimming ratio up to 5000:1; (7)low current-sense reference (300mV) for high efficiency; (8)8V to 26.5V input voltage or higher with external biasing devices; (9)4-wire serial interface to control individual output channels.The MAX16809 LED driver includes 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.

The absolute maximum ratings of the MAX16809 can be summarized as:(1)VCC to AGND:-0.3V to +30V;(2)storage temperature range:-65 to +150;(3)operating temperature range:-40 to +125;(4)junction temperature:+150;(5)V+ to PGND:-0.3V to +6V;(6)total PGND current:960mA.Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied.Exposure to absolute maximum rating conditions for extended periods may affect device reliability.The turn-on supply voltage for the MAX16809 is 8.4V (typ). Once VCC reaches 8.4V, the reference powers up.There is a 0.8V of hysteresis from the turn-on voltage to the UVLO threshold. Once VCC reaches 8.4V, the MAX16809 operates with VCC down to 7.6V. Once VCC goes below 7.6V (typ), the device is in UVLO. When in UVLO, the quiescent supply current into VCC falls back to 32A (typ), and OUT and REF are pulled low.