AS1121-BQFT

Overview

The AS1121-BQFT is a 16-channel LED driver IC from ams OSRAM, designed for high-precision lighting applications. It integrates dot correction and grayscale PWM to ensure uniform brightness across all channels. The device operates within a supply voltage range of 2.7V to 3.6V and supports output voltages up to 30V. Each channel provides a constant current of 40mA, suitable for backlighting and signage. Packaged in a 24-QFN (4x4) format, it functions reliably between -40°C and 85°C ambient temperature.

Feature Summary

• Integrates 16 independent linear current sources with individual dot correction capabilities
• Supports high-resolution grayscale PWM dimming for precise brightness control
• Features internal switches for simplified external circuit design
• Operates on a low-voltage single power supply input

Applications

• LCD backlight systems for mobile devices and displays
• Signage and advertising light boxes
• General illumination requiring uniform color and brightness

Procurement Notes

Verify the specific suffix BQFT against the official datasheet to confirm package type and tape-and-reel specifications. Confirm end-of-life status as distributors may list obsolete inventory. Ensure compatibility with your system's I2C interface requirements and thermal management needs for the QFN package.

Selection Notes

Select this component when 16 individually addressable channels are required with integrated correction features. It is appropriate for designs needing high brightness uniformity without external correction resistors. Consider the 40mA per channel limit and 30V output compliance voltage when sizing the LED array.

Part Context

Part of the AS1122 family, sharing similar functionality but differing in channel count. The AS1121 offers 16 channels compared to the AS1122's 12 channels. Both utilize linear regulation and PWM dimming. This series targets portable electronics and display backlighting markets where space efficiency and color consistency are critical design parameters.

Replacement Considerations

Check for AS1122B-BQFT if fewer channels are acceptable or if pinout compatibility is required. Verify electrical equivalence for current sourcing and voltage ratings before substitution.