AL8891Q

Description

The AL8891Q is an automotive complaint single chip with integrated MOSFETs synchronous step-down LED driver, high-side current sense capable of driving up to 2A constant current with input voltage range from 4.5V to 65V. The AL8891Q provides high switching frequency up to 2.5MHz to optimize high efficiency, allowing a smaller inductor size and compact form factor solution. Pin arrangement allows simple, optimum PCB layout. Constant on time adaptive control is employed to achieve simple control-loop compensation and cycle-by-cycle current limiting with fast dynamic response and fixed frequency.

Features such as fault flag, PWM support, analog and hybrid dimming, internal soft-start, and shutdown provide a flexible and easy-to-use platform for a wide range of applications.

Protection features include thermal shutdown, VIN and VCC undervoltage lockout, cycle-by-cycle current limit, output open & short-circuit protection for LED, and external components open & short protection.

The AL8891Q device is available in the enhanced thermal TSSOP-16EP package.

Feature(s)

• AEC-Q100 Grade 1
• Input Voltage 4.5V to 65V
• VOUT Close to VIN Rail (up to 99% Duty Cycle)
• Integrated MOSFETs High-Side 200mΩ and Low-Side 130mΩ
• 2A Constant Output Current
• High-Side Current Sense
• Support PWM, Analog and Hybrid Dimming
• Hybrid Dimming < 0.01% Resolution
  • Combine Analog (20%) and PWM (0.05% to 5%)
• CISPR25 Class 5 with Frequency Spread Spectrum Built-In
• Internal Compensation Without External Capacitor
• Cycle-by-Cycle Current Protection
• Diagnosis and Fault Flag Indicator
• LED Open and Short Protection
• Overtemperature Thermal Protection and Auto-Restart
• Ambient Temperature -40°C to +125°C
• Thermally Enhanced TSSOP-16EP Package
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
• The AL8891Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. https://www.diodes.com/quality/product-definitions/

Application(s)

• Head lights
• Daytime running lights (DRL)
• Fog lights
• Turn/stop lights
• Map lights
• Dimmable interior/exterior lights