ALED7709ATR

Overview

The ALED7709ATR is an automotive-grade LED driver featuring a boost/SEPIC controller and four low-side constant-current sinkers. It operates within a 4.5 V to 42 V input range, supporting up to 60 V load dump tolerance at 24 V battery systems. The device handles cranking events down to 4 V supply. It integrates mixed PWM and analog dimming capabilities controlled via PWMI or I2C interfaces. The package is QFN-24.

Feature Summary

• Combines a DC-DC controller with four constant-current sinks for high brightness LED strings
• Supports standalone mode (SAM) and bus driven mode (BDM) via I2C interface
• Includes adaptive boost voltage optimization for maximum efficiency
• Integrates overvoltage, overcurrent, thermal shutdown, and open/short fault detection

Applications

• Automotive infotainment display backlighting
• Head-up display (HUD) illumination
• Instrument cluster lighting
• Ambient interior lighting control

Procurement Notes

Verify the specific suffix 'ATR' against the manufacturer datasheet to confirm reel packaging specifications and tape-and-reel dimensions. Ensure the component meets AEC-Q100 Grade 1 qualification requirements for your target automotive application environment. Confirm that the QFN-24 package variant matches your PCB footprint design constraints.

Selection Notes

Select this component when designing automotive lighting systems requiring integrated power conversion and multi-channel current regulation. It is suitable for applications needing simultaneous or exclusive control through PWMI signals or I2C serial interfaces. Consider the internal oscillator and programmable PWM frequency settings if external clock sources are unavailable in the system architecture.

Part Context

The ALED7709 series belongs to STMicroelectronics' automotive LED driver portfolio, designed specifically for high-efficiency lighting solutions. The ALED7709A variant is dedicated to Bus Driven Mode (BDM), while the ALED7709B is optimized for Standalone Mode (SAM). This family supports advanced features accessible only through the I2C interface, providing flexibility for complex automotive lighting architectures.

Replacement Considerations

For BDM applications, consider the ALED7709A. For SAM applications, consider the ALED7709B. These variants share the same core functionality but differ in default operational modes and feature access levels as defined by their specific suffixes.

FAQ

What protection features are included in the ALED7709?

The device implements overvoltage, overcurrent, and thermal shutdown protections. It also includes "Open and Short" LED fault detection with optional channel auto-disconnect capabilities.

How is the brightness of the LED strings controlled?

Brightness can be controlled in global or local modes using mixed PWM and analog dimming. The PWM dimming frequency is programmable via an internal 16-bit counter.