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MAX6978 - 5.5V Constant-Current LED Driver

General Description

The MAX6978 serial-interfaced LED driver provides eight open-drain, constant-current sinking LED driver outputs rated at 5.5V.

The MAX6978 operates from a 3V to 5.5V supply.

The MAX6978 supply and the LEDs’ supply can power up in any order.

Key Features

  • 25Mb Industry-Standard 4-Wire Serial Interface at 5V MAX6978 Ordering Information PART MAX6978AUE MAX6978APE MAX6978AEE TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C PIN-.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-3578; Rev 1; 3/05 8-Port, 5.5V Constant-Current LED Driver with LED Fault Detection and Watchdog General Description The MAX6978 serial-interfaced LED driver provides eight open-drain, constant-current sinking LED driver outputs rated at 5.5V. The MAX6978 operates from a 3V to 5.5V supply. The MAX6978 supply and the LEDs’ supply can power up in any order. The constant-current outputs are programmed together to up to 55mA using a single external resistor. The MAX6978 operates with a 25Mb, industry-standard, 4-wire serial interface. The MAX6978 includes circuitry that automatically detects open-circuit LEDs. Fault status is loaded into the serial-interface shift register when LE goes high and is automatically shifted out on DOUT when the next data transmission is shifted in.