AL8859Q high-efficiency two-phase SPI boost controller| Electronics Weekly

The company says it will meet the power density, efficiency, EMI, and functional safety requirements of advanced headlight control units.

Specifically, it can serves as the primary constant-voltage pre-stage for adaptive front lighting systems. These include high beams, low beams, daytime running lights (DRL), turn indicators, fog lights, and cornering lights. And it will be as one integrated lighting module.

Note, Diodes says the AL8859Q also addresses broader power systems for automotive applications.

Input voltage

“The AL8859Q integrates a current-mode multi-phase boost architecture with a wide 4.5V to 60V input voltage range, enabling operation across standard 5V, 12V, 24V, and 48V supply rails. It also improves output voltage tolerance under load dump and transient conditions through programmable registers.”

“A single device supports two phases; scaling to three or four phases requires synchronizing devices. This makes it suitable for 100W to 400W output power with a balanced thermal distribution, low ripple current, and system efficiency of ~95%, while minimizing external component stress by using Diodes Incorporated’s automotive-compliant discrete components, including MOSFETs, SBRs, and TVS diodes.”

Frequency modulation

The AL8859Q incorporates spread-spectrum frequency modulation to help compliance with CISPR 25 Class 5 EMI requirements. And it has a voltage accuracy of ±0.5% at 50V (typ.) for a stable supply for downstream LED drivers with high-current accuracy. This improves light consistency and reliability across operating conditions, says Diodes.

Housed in a compact wettable flank V-QFN4040-24/SWP package, the AL8859Q measures 4mm x 4mm. And is priced at $0.60 in 10,000-piece quantities.

Note that a standard compliance version, the AL8859, is available for industrial and consumer applications.

AL8859Q features

• AEC-Q100 Grade 1
• Functional Safety-Capable
• Wide Input-Voltage Range 4.5V to 60V
• Output-Voltage Accuracy ±0.5% @50V typical
• Soft-Start and High Efficiency 95%
• SPI Programmable Features
− Up to 4-Phase Control
− Output-Voltage Regulation
− Programmable Switching Frequency
− Switching Current Limit, Overvoltage
− Diagnostic and Protection Registers
− One-Time Programming (OTP)
• Spread Spectrum to Improve EMI
• Fail-Safe Operating (FSO) Mode, Stand-Alone Mode
• Wettable V-QFN4040-24/SWP Package (4mm ×4mm)
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)

More information is on the Diodes website, including a datasheet.

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