MAX16831 Datasheet | Maxim Integrated

19-0809; Rev 0; 4/07 High-Voltage, High-Power LED Driver with Analog and PWM Dimming Control General Description The MAX16831 is a current-mode, high-brightness LED (HBLED) driver designed to control two external n-channel MOSFETs for the single-string LED current regulation. The MAX16831 integrates all the building blocks necessary to implement fixed-frequency HBLED drivers with wide-range dimming control. The MAX16831 is configurable to operate as a step-down (buck), step-up (boost), or step-up/-down (buck-boost) current regulator. Current-mode control with leading-edge blanking simplifies control-loop design. Internal slope pensation stabilizes the current loop when operating at duty cycles above 50%. The MAX16831 operates over a wide input voltage range and is capable of withstanding automotive load-dump events. Multiple MAX16831s can be synchronized to each other or to an external clock. The MAX16831 includes a floating dimming driver for brightness control with an external n-channel MOSFET in series with the LED string. HBLED drivers using the MAX16831 achieve efficiencies of over 90% in automotive applications. The MAX16831 also includes a 1.4A source and 2.5A sink .. gate driver for driving switching MOSFETs in high-power LED driver applications, such as front light assemblies. The dimming control allows for wide PWM dimming at frequencies up to 2k Hz. Higher dimming ratios of up to 1000:1 are achievable at lower dimming frequencies. The MAX16831 is available in a 32-pin thin QFN package with exposed pad and operates over the -40 ° C to +125°C automotive temperature range. Features o Wide Input Range: 6V to 76V With Cold-Start Operation to 5.5V o Integrated Differential LED Current-Sense Amplifier o Floating Dimming Driver Capable of Driving an n-Channel MOSFET o 5% LED Current Accuracy o 200Hz On-Board Ramp Syncs to External PWM Dimming Signal o Programmable Switching Frequency (125k Hz to 600k Hz) and Synchronization o Output...