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HB-LED drivers suit automotive lighting apps

Posted: 15 Feb 2007 ?? ?Print Version ?Bookmark and Share

Keywords:HB-LED? LED driver? automotive? Maxim? LEDs?

Maxim Integrated Products has introduced the MAX16823, a high-voltage, 3-channel, linear high-brightness LED (HB-LED) driver with open-LED detection for automotive exterior and interior lighting applications.

This device operates from a 5.5V to 40V input-voltage range, ensuring cold-start and load-dump (up to 45V) compliance. The MAX16823 delivers up to 70mA per channel to one or more strings of HB-LEDs, while operation above 70mA is possible with the addition of an inexpensive external bipolar-junction transistor (BJT). It also features an active-high, open-drain LEDGOOD output for open-LED detection. This combination of performance and integration makes the MAX16823 suitable for applications that use HB-LEDs for rear combination lamps (RCLs), center high-mounted stop lamps (CHMSL), warning lights and RGB ambient lighting.

Programmable current
Because the current for each of the MAX16823's channels is programmable using an external current-sense resistor in series with LEDs, different LED current levels can be set independently for each string when required. An accurate internal reference provides 5 percent LED current accuracy over the entire voltage and temperature operating ranges. Three dimming inputs allow for a wide range of independent PWM dimming, as well as on/off output-enable control.

Wave-shaping circuitry minimizes EMI during low-frequency PWM dimming while providing fast turn-on and turn-off times. Additionally, a very low-dropout voltage (0.7V, max) in each channel makes the design easier for low-input-voltage values or with a long string of LEDs connected in series. An on-board, 3.4V voltage regulator is capable of supplying up to 4mA to external circuitry. A rugged LED driver, the MAX16823 features output short-circuit and overtemperature protection, as well as undervoltage lockout.

Automotive temp
The MAX16823 is specified for the automotive temperature range (-40C to 125C). It is available in a Pb-free, 16-pin, TQFN (MAX16823ATE+) or TSSOP (MAX16823AUE+) package with exposed pad. Prices start at 99 cents for the MAX16823ATE+ and 97 cents for the MAX16823AUE+ (1,000-up, FOB USA).

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