200 mA, 4-channel Automotive LED driver with an integrated adaptive DC-DC controller



Designed to drive strings of high-brightness LEDs, the ALED7709 combines a Boost and SEPIC DC/DC controller with four low-side constant-current sink circuits.

This LED driver can work simultaneously or exclusively in standalone mode (SAM) controlled by a PWM input signal and in bus-driven mode (BDM) through an I²C serial interface.

The embedded DC-DC controller has a specific adaptive output voltage regulation to maximize the system efficiency.

A ready-to-use evaluation board (STEVAL-LLL014V1 ) based on the 4-channels ALED7709 automotive LED driver as well as a user-friendly graphical interface (STSW-LLL014GUI) for configuring the ALED7709 are available to help reduce development time and cost.

The ALED7709 is AEC-Q100 Grade 1 qualified.


DC-DC controller main features

  • Wide input voltage range: 4.5 to 42 V (60 V load dump)
  • Boost and SEPIC DC/DC controller topologies supported with adaptive mode minimizing power losses with any #LEDs
  • Adjustable (250 kHz to 2.2 MHz) switching frequency with optional spread spectrum
  • Cycle-by-cycle power switch OCP, Input OVP and output SCP


LED driver main features

  • Up to 42V output voltage channels
  • Programmable output current per channel up to 200 mA and with paralleled channels up to 800 mA
  • Mixed PWM and analog dimming (100 Hz to 12.8 kHz dimming frequency)
  • Dimming ratio 10000:1 at 100 Hz
  • Open channel and LED short-circuit detection
  • Selectable channel phase-shifting and adjustable rise/fall time


Main benefits

  • Single-chip 4-channels LED driver and DC-DC controller
  • Optional support for line protection switch control
  • ±2% LED output current accuracy
  • Simultaneous or exclusive control by PWMI and I²C interface
  • Two pre-configured versions: for BDM with MCU support (ALED7709A) and for SAM (ALED7709B)


Key applications

puddle-lamp Ambient light
car-sharing Instrument lighting system
infotainment-display class= Infotainment display


Recommended resources





Automotive Standard Analog ICs: Robustness and Performance

This brochure presents a large portfolio of ST’s products and solutions dedicated to voltage regulation, signal amplification, current sensing, that are needed for today’s ever-growing automotive industry.



eDesignSuite: A free, on-line design tool with advanced features for power management systems and subsystems

A comprehensive, flexible suite of design aid utilities and engineering tools, eDesignSuite helps engineers design high-efficiency power solutions with a wide range of ST products meeting user application requirements.





Evaluation Board : STEVAL-LLL014v1

The STEVAL-LLL014V1 is a four LEDs strings evaluation kit based on the ALED7709 LED driver configured in boost.


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