EVALUATION KIT AVAILABLE MAX16833/MAX16833B/C/D/G High-Voltage HB LED Drivers with Integrated High-Side Current Sense General Description The MAX16833, MAX16833B, MAX16833C, MAX16833D, and MAX16833G are peak current-mode-controlled LED drivers for boost, buck-boost, SEPIC, flyback, and highside buck topologies. A dimming driver designed to drive an external p-channel in series with the LED string provides wide-range dimming control. This feature provides extremely fast PWM current switching to the LEDs with no transient overvoltage or undervoltage conditions. In addition to PWM dimming, the ICs provide analog dimming using a DC input at ICTRL. The ICs sense the LED current at the high side of the LED string. A single resistor from RT/SYNC to ground sets the switching frequency from 100kHz to 1MHz, while an external clock signal capacitively coupled to RT/SYNC allows the ICs to synchronize to an external clock. In the MAX16833/C/G, the switching frequency can be dithered for spread-spectrum applications. The MAX16833B/D instead provide a 1.64V reference voltage with a 2% tolerance. The ICs operate over a wide 5V to 65V supply range and include a 3A sink/source gate driver for driving a power MOSFET in high-power LED driver applications. Additional features include a fault-indicator output (FLT) for short or overtemperature conditions and an overvoltage-protection sense input (OVP) for overvoltage protection. High-side current sensing combined with a p-channel dimming MOSFET allow the positive terminal of the LED string to be shorted to the positive input terminal or to the negative input terminal without any damage. This is a unique feature of the ICs.
Ordering Information appears at end of data sheet. Integration Minimizes BOM for High-Brightness LED Driver with a Wide Input Range Saving Space and Cost +5V to +65V Wide Input Voltage Range with a Maximum 65V Boost Output Integrated High-Side pMOS Dimming MOSFET Driver (Allows Single-Wire Connection to LEDs) ICTRL Pin for Analog Dimming Integrated High-Side Current-Sense Amplifier Full-Scale, High-Side, Current-Sense Voltage of 200mV Simple to Optimize for Efficiency, Board Space, and Input Operating Range Boost, SEPIC, and Buck-Boost Single-Channel LED Drivers 2% Accurate 1.64V Reference (MAX16833B/D) Programmable Operating Frequency (100kHz to 1MHz) with Synchronization Capability Frequency Dithering for Spread-Spectrum Applications (MAX16833/C/G) Thermally Enhanced 5mm x 4.4mm, 16-Pin TSSOP Package with Exposed Pad Protection Features and Wide Temperature Range Increase System Reliability Short-Circuit, …
