MAX16821B Datasheet | Maxim Integrated

Description - - - - - - - - - - - - - Features Up to 30A Output Current True-Differential Remote Output Sensing Average Current-Mode Control 4.75V to 5.5V or 7V to 28V Input-Voltage Range 0.1V/0.03V LED Current-Sense Options Maximize Efficiency (MAX16821B/MAX16821C) Thermal Shutdown Nonlatching Output Overvoltage Protection Low-Side Buck Mode with or without Synchronous Rectification High-Side Buck and Low-Side Boost Mode with or without Synchronous Rectification 125k Hz to 1.5MHz Programmable/Synchronizable Switching Frequency Integrated 4A Gate Drivers Clock Output for 180° Out-of-Phase Operation for Second Driver -40°C to +125°C Operating Temperature Range MAX16821A/MAX16821B/MAX16821C The MAX16821A/MAX16821B/MAX16821C pulsewidth-modulation (PWM) LED driver controllers provide high output-current capability in a pact package with a minimum number of external ponents. The MAX16821A/MAX16821B/MAX16821C are suitable for use in synchronous and nonsynchronous step-down (buck), boost, buck-boost, SEPIC, and Cuk LED drivers. A logic input (MODE) allows the devices to switch between synchronous buck and boost modes of operation. These devices are the first high-power drivers designed specifically to acmodate mon-anode HBLEDs. The ICs offer average current-mode control that enable the use of MOSFETs with optimal charge and on-resistance figure of merit, thus minimizing the need for external heatsinking even when delivering up to 30A of LED current. The differential sensing scheme provides accurate control of the LED current. The ICs operate from a 4.75V to 5.5V supply range with the internal regulator disabled (VCC connected to IN). These devices operate from a 7V to 28V input supply voltage with the internal regulator enabled. The MAX16821A/MAX16821B/MAX16821C feature a clock output with 180° phase delay to control a second out-of-phase LED driver to reduce input and output filter capacitor size and to minimize ripple currents. The wide switching frequency range (125k...