MAXIM Integrated Products, represented in Australia by Arrow Electronics, has introduced an adjustable linear current regulator that can provide up to 350mA of current to one or more strings of high-brightness LEDs (HB LEDs), the MAX16800.
A wide operating input-voltage range of 6.5V to 40V makes the MAX16800 suitable for automotive, commercial, and industrial applications, and helps protect against large transients like those found in load-dump and cold cranking situations.
The MAX16800 combines an accurate current-sense reference with differential LED current sensing to provide load accuracy of ±3.5%. This current accuracy allows consistent brightness for all light assemblies.
Also, the device's low-dropout pass element (0.5V typical) and low-voltage (204mV) current-sense reference minimise power dissipation in the system.
The PWM, pulsed-current dimming at the output, is possible by pulsing the Enable input (EN) or by pulsing Vin.
Wave-shaped circuitry generates soft-edges on pulse loads and reduces EMI during PWM dimming.
A fixed 5V output regulator delivers up to 4mA of load current for low-power applications throughout the 6.5V to 40V input-voltage range.
The on-board 5V regulator can power a microcontroller or other external components. Two small ceramic capacitors and a small sense resistor keep footprints very compact while minimising cost.
The MAX16800 is rated for operation over the automotive temperature range (-40°C to +125°C). It features thermal and output short-circuit protection.
The device is available in a thermally enhanced, surface-mount, 5mm x 5mm, 16-pin TQFN package rated at 2.6W power dissipation. It is also available in a lead-free package.