Boost controller for backlighting in automotive applications

BACKLIGHTING SOLUTIONS Boost controller for backlighting in automotive applications

2025-11-27 Source: Press release Diodes Incorporated 2 min Reading Time

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Diodes Incorporated introduces the AL3069Q, an automotive-compliant high-efficiency 60V boost controller for backlight applications. The device includes four 80V high-precision current sink channels to accommodate larger LED display panels, and extensive diagnostic functions for optimum system safety and reliability.

Symbolic image: Automotive taillights featuring advanced backlighting from Diodes' new boost controller(Source: © Kara - stock.adobe.com) — Symbolic image: Automotive taillights featuring advanced backlighting from Diodes' new boost controller
(Source: © Kara - stock.adobe.com)

With built-in adaptive boost voltage control, the AL3069Q operates over a wide input voltage range from 4.5V to 60V. This covers the common automotive power supply rails (12V, 24V, and 48V), providing greater flexibility in system design. Its boost operating switching frequency is adjustable from 100kHz to 1MHz to address various application requirements toward high-efficiency or compact PCB layouts.

The four integrated 80V LED current sink channels can be set using an external resistor with a current matching of ±0.5% (typ.) between channels and devices, ensuring display uniformity and consistent brightness. Each string can deliver 250mA, with a pulse current of up to 400mA, supporting a longer string of LEDs for higher output power. This capability makes the device suitable for differently sized and larger LED panels up to 32” diagonal. The AL3069Q supports PWM-to-analog dimming, achieving a minimum duty cycle of 1/5000 at 100Hz, enhancing brightness control precision and reducing LED color shift.

The STGAP4S gate driver ensures robust EV-powertrain control with integrated diagnostics and flexible inverter management across various power levels. Learn more about this here. (Source: © Tahsin - stock.adobe.com)

Designed with system robustness in mind for automotive applications, it incorporates extensive fault diagnostics and robust protection features. These include cycle-by-cycle current limit, soft-start, undervoltage lockout (UVLO), programmable overvoltage protection (OVP), overtemperature protection (OTP), LED-open/-short protection, Schottky diode-short and -open protection, inductor-short-circuit protection, and V_OUT-short protection. A dedicated fault indicator (FAULTB) pin is also included to report faulty conditions.

The AL3069Q is supplied in the TSSOP-16EP (Type DX) and U-QFN4040-16/SWP (Type UXB) packages, offering a cost-effective solution with low pin counts and compact sizing. It is available at $0.54 in 1,000-piece quantities. A standard compliance version, the AL3069, is available and suitable for industrial and commercial applications.

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