Lumissil Linear automotive LED driver

The IS32LT3146 device is a 6-Chs linear LED driver with a power resistor to shunt the power dissipation to optimize the thermal stress on the device. It supports both sequential turn on mode and traditional blink mode for turn signal light application. A logic level at the SEQEN pin is used to switch between these two modes. The startup delay time and channel to channel internal delay time of the sequential turn on are fully programmable by external resistors, and microcontroller is not required.

The sequential turn on mode is able to implement multiple devices synchronization operation to realize more than 6 LED strings sequential turn on.

Key features

• 6-CH current source driver, Programmable sequential turn on of each channel
• Max. current: 75mA per channel, 450mA in parallel operation
• Wide input voltage range: 5V~40V , Thermal shunt resistor to offload device thermal stress
• Robust fault protection with reporting(“one fail all fail” or “one fail other on”)

Additional features

• Wide input voltage range: 5V~40V
• Thermal shunt resistor to optimize the device thermal stress
• Programmable sequential turn on of each channel
  • ±5% timer accuracy
  • Timing programmable by external resistors
  • Stand-alone sequential turn on timing for multiple devices operation (no signal wire connection among the devices)
  • Synchronized sequential turn on timing for multiple devices operation
  • Sequential turn on style selectable: one by one, two by two, three by three or all simultaneous on
  • Single pin to select between sequential turn on mode or traditional blink mode
     
• 6-CH current source driver
• Parallel outputs for higher current using multiple channels of a single IC or multiple ICs
• Adjustable constant output current set by a single resistor
  • Max. current: 75mA per channel
  • Max. current: 450mA in parallel operation
     
• Low headroom voltage
  • Max headroom: 500mV at 25mA per channel
  • Max headroom: 900mV at 75mA per channel
     
• Robust fault protection with reporting:
  • Fault modes selectable: “one fail all fail” or “one fail other on”
  • Single LED shorted - single resistor to set the detection threshold
  • LED string open/ short
  • Current setting pin (ISET) open/short
  • Thermal shutdown
  • External UVLO setting for single LED short and -LED string open detection
  • FAULTB pin for failure reporting, allowing parallel bus connection
     
• Current slew rate control to optimize EMI performance
• Thermal roll-off – over junction temperature current derating
• Operating junction temperature range -40°C to 150°C
• AEC-Q100 Qualified

Applications

• Sequential turn light
• Rear light
• Welcome light