STMicroelectronics ALED7707

Overview

ALED7707 from STMicroelectronics is an AEC-Q100 qualified automotive LED driver IC integrating a 4.5–36 V boost regulator and six independent 85 mA current-sink rows for LCD panel backlighting. It delivers up to 36 V output, supports 1% PWM dimming at 1 kHz, provides ±3% row current matching, and detects open/short LED faults in real time - deployed in infotainment displays and dashboard backlight systems.

For engineers reviewing the ALED7707 datasheet, ALED7707 pinout, ALED7707 application, or ALED7707 equivalent, key selection criteria include its 6-row current-sink architecture, programmable soft-start, external sync capability, OVP threshold adjustability via OVSEL, and thermal shutdown at 150 °C - all critical for automotive display power integrity and fault resilience.

Technical Context

The ALED7707 implements a constant-frequency peak current-mode boost controller with automatic minimum-voltage-drop row selection: the error amplifier regulates output voltage by comparing the lowest LED string voltage (fed via internal min-selector) against a 830 mV typ. reference, enabling precise rail tracking across variable forward voltages. The boost section integrates a 570 mΩ R_DS(on) MOSFET and supports adjustable switching frequency (250 kHz–1 MHz) via FSW resistor or external sync signal.

The backlight driver uses six matched current generators, each programmable up to 85 mA via RILIM resistor, with <10 µs minimum PWM on-time and dedicated FAULT/MODE pins for open- and short-circuit LED detection. Fault management operates independently per row and outputs status via open-drain FAULT pin, while MODE pin configures fault response behavior without disabling functional rows.

Key Specifications

Pinout & Package

Package: QFN 5×5 mm, 24-lead, exposed thermal pad (TPAD) electrically connected to SGND. Requires solder paste stencil optimization and thermal vias under TPAD for ≤35 °C/W junction-to-ambient performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-row LED driver applications.

Compared with MAX16832 and TPS61196, the ALED7707 uniquely combines AEC-Q100 Grade 1 qualification, full open/short LED fault coverage, and 85 mA per row in a single monolithic package - making it the only option qualified for safety-critical dashboard backlighting with zero tolerance for undetected LED opens.

Availability

ALED7707 is available at Aetrix Electronics and suitable for automotive infotainment systems, instrument cluster backlighting, and exterior lighting modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ALED7707 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and automotive-grade analog devices since 1987.

The ALED7707 belongs to ST's automotive LED driver product line, engineered specifically for high-reliability LCD backlighting in vehicles - emphasizing fault resilience, thermal robustness, and AEC-Q100 compliance from design inception.

FAQ

What is the minimum PWM dimming frequency supported while maintaining 1% duty cycle resolution?

The ALED7707 maintains stable 1% dimming duty cycle down to 100 Hz, verified across –40 °C to +125 °C. At 1 kHz, it achieves full 10-bit effective resolution with <10 µs minimum on-time - enabling flicker-free operation in both daylight and night modes without requiring external dimming controllers.

How does the device handle unused LED rows during operation?

Unused rows (e.g., ROW4–ROW6 in a 3-row design) can be left floating - the internal current generator automatically disables and draws negligible leakage (<1 µA). No external resistors or switches are needed, and floating-row detection triggers only during soft-start, avoiding false fault assertions during normal operation.

Can the boost output voltage exceed 36 V under fault conditions?

No - the adjustable OVP circuit clamps output voltage precisely at the programmed threshold (e.g., 36 V), with 10 mV hysteresis. When OVSEL detects overvoltage, switching halts immediately and resumes only after the sensed voltage falls below the threshold minus hysteresis - preventing capacitor stress or LED overvoltage damage.

Is external compensation required for the boost control loop?

Yes - a series RC network must be connected between COMP and SGND to stabilize the peak-current-mode boost loop. Typical values are 10 kΩ and 1 nF, tuned per inductor value and output capacitance; ST provides loop compensation guidelines in Section 6.1.1 of the datasheet for production-level stability validation.