Maxim 100mA HB LED Driver Provides Fault Output and Multichip Interoperability for Automotive Lighting

Maxim Integrated Products announced the MAX16839, a high-input-voltage linear HB (high-brightness) LED driver capable of delivering up to 100mA. This device minimizes external component count by integrating a pass element and fault detection. In addition, it allows interoperability of multiple drivers in multistring applications. With its wide input-voltage range (5 to 40V), the company states that the MAX16839 provides a cost-effective solution for automotive tail-light, side-lamp, and turn-signal applications.

Due to its onboard pass transistor and wide input-voltage range, the MAX16839 is able to maintain a constant LED current, even when the battery voltage changes. The device can sustain load-dump events up to 45V and keep the LED current constant during them. In addition to improving light quality, this capability protects the LEDs from the stress of load dumps, thereby extending battery life.

The MAX16839 includes a fault-detection output that is triggered if an LED fails and opens the circuit. This feature can also be configured in multistring/multichip applications so that if one LED string fails, all the others turn off as well. The fault condition is latched so that the other LED strings do not blink when one fails. According to the company, this unique capability enables system designers to meet the fault-detection requirements for automotive turn-signal light applications, while minimizing both component count and cost.

The MAX16839 is available in thermally enhanced 8-pin SO and 6-pin TDFN packages and is fully specified to operate over the -40 to +125°C automotive temperature range. Prices start at $0.73 (1000-up, FOB USA).