ALED1262ZTTR

Overview

The ALED1262ZTTR is an automotive-grade monolithic LED driver IC featuring 12 constant current output channels. It supports a supply voltage range of 5.5 V to 38 V and provides regulated current from 6 mA to 60 mA per channel, programmable via a single external resistor. The device includes 7-bit PWM local dimming control with non-linear steps for human eye perception adjustment. It operates in bus-driven mode (BDM) via I²C interface up to 400 kHz or standalone mode (SAM) using OTP configuration. Key features include open-LED error detection, thermal shutdown at 170 °C, overtemperature alert, internal clock dithering for EMI reduction, and gradual output delay to minimize inrush current.

Feature Summary

• Automotive-grade reliability with AEC-Q100 qualification
• Independent 7-bit PWM dimming with exponential brightness correction per channel
• Dual operation modes: Bus-driven (I²C) and Standalone (OTP)
• Integrated diagnostics including open-LED detection and thermal protection

Applications

• Automotive exterior rear combination lighting
• Automotive interior lighting systems
• LED matrix displays requiring graphic animations
• High-density LED arrays with series-connected LEDs

Procurement Notes

Verify the package type matches the required PCB footprint, as this component uses a 24-HTSSOP package with exposed pad. Confirm the suffix 'TR' indicates tape and reel packaging if automated assembly is planned. Ensure the order quantity aligns with standard reel sizes specified by the manufacturer. Check for any specific handling requirements related to moisture sensitivity level (MSL 3). Validate that the revision level meets the design specifications.

Selection Notes

Select this component when designing automotive lighting systems requiring high channel count and precise individual LED control. It is suitable for applications needing both centralized I²C management and autonomous fallback operation. Consider its 38 V output capability for driving multiple LEDs in series. Evaluate the need for built-in EMI reduction features and thermal management capabilities. Ensure the system architecture supports either BDM or SAM modes based on complexity and cost constraints.

Part Context

The ALED1262ZTTR belongs to STMicroelectronics' portfolio of automotive LED array drivers designed for advanced lighting solutions. It complements evaluation kits like STEVAL-LLL002V1, which utilize this driver for rear light pattern animations. The device is part of a broader family of energy-efficient DC/DC powered LED drivers, targeting general lighting, display backlighting, and automotive applications. It shares functional similarities with other multi-channel drivers but offers specific optimizations for automotive rear lighting flexibility.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. Designers should evaluate pin-to-pin compatibility and electrical parameter alignment if considering alternative vendors. Verify that any replacement maintains AEC-Q100 qualification and similar diagnostic features for automotive safety compliance.

FAQ

What is the maximum supply voltage supported by the ALED1262ZTTR?

The device supports a supply voltage range from 5.5 V to 38 V.

How is the output current programmed?

The output current, ranging from 6 mA to 60 mA, is programmed by a single external resistor.

Does the ALED1262ZTTR support standalone operation without a microcontroller?

Yes, it can operate in standalone mode (SAM) using internal custom configuration stored in One-Time Programmable (OTP) memory.