MAX16818

The MAX16818 pulse-width modulation (PWM) LED driver controller provides high-output-current capability in a compact package with a minimum number of external components. The MAX16818 is suitable for use in synchronous and nonsynchronous step-down (buck) topologies, as well as in boost, buck-boost, SEPIC, and Cuk LED drivers. The MAX16818 is the first LED driver controller that enables Maxim's technology for fast LED current transients of up to 20A/s and 30kHz dimming frequency.

Features of the MAX16818 are:(1)high-current LED driver controller IC, up to 30A output current; (2)average-current-mode control; (3)true-differential remote-sense input; (4)4.75V to 5.5V or 7V to 28V input voltage range; (5)programmable switching frequency or external synchronization from 125kHz to 1.5MHz; (6)clock output for 180° out-of-phase operation; (7)integrated 4A gate drivers; (8)output overvoltage and hiccup mode overcurrent protection; (9)thermal shutdown; (10)thermally enhanced 28-pin thin QFN package.

The absolute maximum ratings of the MAX16818 can be summarized as:(1)IN to GND:-0.3V to +45V;(2)storage temperature range:-60 to +150;(3)operating temperature range:-40 to +125;(4)junction temperature:+150;(5)continuous power dissipation:1454.5mW.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.This device utilizes average-current-mode control that enables optimal use of MOSFETs with optimal charge and on-resistance characteristics. This results in the minimized need for external heatsinking even when delivering up to 30A of LED current. True differential sensing enables accurate control of the LED current. A wide dimming range is easily implemented to accommodate an external PWM signal. An internal regulator enables operation over a wide input voltage range: 4.75V to 5.5V or 7V to 28V and above with a simple external biasing device. The wide switching frequency range, up to 1.5MHz, allows for the use of small inductors and capacitors.