AS1109-BQFR

Overview

The AS1109-BQFR is an eight-channel constant-current LED driver designed for high-speed serial interface control. It operates on a DC voltage range of 3V to 5.5V with a switching frequency between 30MHz and 50MHz. Each channel delivers up to 100mA output current, adjustable via an external resistor (REXT), with a恒流精度 of 2%. The device features PWM dimming and integrates diagnostic functions including short circuit protection (SCP), open LED protection, over-temperature protection (OTP), and flicker reduction. It supports a wide operating temperature range from -40°C to +125°C.

Feature Summary

• Integrates eight independent constant-current sinks with programmable output levels
• Includes comprehensive on-chip diagnostics for load faults and thermal conditions
• Features a flexible serial interface with integrated shift and data registers
• Supports low-current diagnostic mode to minimize display flicker during testing

Applications

• LED traffic sign systems
• Large-capacity data transmission displays
• Industrial LED lighting applications
• Automotive exterior lighting modules

Procurement Notes

Verify the specific suffix BQFR against the manufacturer's latest datasheet to confirm package type and material specifications. Ensure compatibility with the required serial interface protocol and check for any automotive qualification certifications if used in vehicle environments. Cross-reference pinouts with the VQFN-16-EP(4x4) footprint documentation to prevent assembly errors.

Selection Notes

Select this component when driving multiple LEDs requires individual current control and robust fault detection. The high switching frequency supports efficient power conversion in compact designs. Consider the thermal management requirements given the +125°C maximum junction temperature rating. Evaluate the serial interface speed against system latency constraints before finalizing the design.

Part Context

The AS1109 belongs to ams OSRAM's family of constant-current LED drivers featuring integrated diagnostics. It complements higher-channel variants like the AS1110 by providing a cost-effective solution for eight-channel applications. The device targets markets requiring reliable LED control with minimal external components, leveraging the manufacturer's expertise in optical and sensor solutions.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult official cross-reference tools or contact technical support for verified alternatives that match electrical and mechanical specifications.