MAX16833

The MAX16833 is peak current-modecontrolled LED driver for boost, buck-boost, SEPIC, flyback, and high-side 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.

Features of the MAX16833 are:(1)boost, SEPIC, and buck-boost single-channel LED drivers; (2)+5V to +65V wide input voltage range with a Maximum 65V boost output; (3)integrated high-side current-sense amplifier; (4)ICTRL pin for analog dimming; (5)integrated high-side pMOS dimming MOSFET driver (allows single-wire connection to LEDs); (6)programmable operating frequency (100kHz to 1MHz) with Synchronization capability; (7)frequency dithering for spread-spectrum applications; (8)full-scale, high-side, current-sense voltage of 200mV; (9)short-circuit, overvoltage, and thermal protection; (10)fault indicator output.

The absolute maximum ratings of the MAX16833 can be summarized as:(1)IN to GND:-0.3V to +70V;(2)storage temperature range:-65 to +150;(3)operating temperature range:-40 to +125;(4)junction temperature:+150;(5)continuous power dissipation:2089mW.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 output impedance of the SYNC source should be low enough to drive the current through R2 on the rising edge. The rise/fall times of the SYNC source should be less than 50ns to avoid excessive voltage drop across C1 during the rise time. The amplitude of the SYNC source can be between 4V and 5V. If the SYNC source amplitude is 5V and the rise time is less than 20ns, then the maximum peak voltage at RT/SYNC pin can get close to 6V.Under such conditions, it is desirable to use a resistor in series with C1 to reduce the maximum voltage at the RT/SYNC pin. For proper synchronization,the peak SYNC pulse voltage at RT/SYNC pin should exceed 3.8V.