Product category:
Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX16803
Edited by the Electronicstalk Editorial
Team on 08 May 2006
Constant current source promises stable
lighting
An adjustable constant current source provides up to 350mA of current to one or more strings of high-brightness LEDs
New from Maxim Integrated Products, the MAX16803 is an adjustable constant current source that provides up to 350mA of current to one or more strings of high-brightness LEDs (HBLEDs) A wide operating input-voltage range of 6.5 to 40V helps protect against large transients such as load-dump and cold cranking
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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Its high-voltage (40V) PWM pin allows a wide dimming range.
The MAX16803 is ideal for automotive lighting, LED display backlight, industrial and architectural lighting applications.
The MAX16803 regulator combines a low-voltage (204mV) 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.
The device's low-dropout pass element (0.5V typical) and current-sense reference minimises power dissipation in the system.
Multiple MAX16803 LED driver ICs can be paralleled to deliver current greater than 350mA to a single high-power LED.
Brightness can be adjusted by using output PWM dimming in which the dedicated dimming input or the input voltage is pulsed.
Wave-shaped circuitry generates soft rise and fall LED current edges of equal duration, and reduces EMI during short turn-on and turn-off transitions.
A fixed, 5V output regulator delivers up to 4mA of load current for low-power applications throughout the 6.5 to 40V input-voltage range.
For greater design flexibility, the regulator can also power a microcontroller or other external components.
The regulator stays on even when the dimming pin is pulled low.
Two small ceramic capacitors and a small sense resistor result in a minimal board size and minimise total driver cost.
The MAX16803 is rated for operation over the automotive temperature range (-40 to +125C).
It features thermal and short-circuit protection.
The device is available in a thermally enhanced, surface-mount, 5 x 5mm, 16-pin TQFN package rated at 2.67W power dissipation.
It is also available in a lead-free package.
Prices start at $0.99 (1000-up, FOB USA).
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