LT8500ETJ

LED Driver IC Overview

The LT8500ETJ is a pulse width modulation (PWM) generator featuring 48 independent channels designed for LED lighting applications. It operates within an input voltage range of 3 V to 5.5 V and utilizes a 56-pin TLA QFN package. Each channel incorporates an individually adjustable 12-bit PWM register providing 4096 resolution steps, alongside a 6-bit correction register offering ±50% adjustment capability. The device supports a 50 MHz cascadable serial interface for efficient control.

LED Driver IC Feature Summary

• Provides 48 independent PWM channels with individual 12-bit resolution control
• Integrates a 6-bit correction register for precise per-channel brightness adjustment
• Supports high-speed 50 MHz cascadable serial interface operation

LED Driver IC Applications

• Driving resistor ballasted LED strings from a VDD rail
• Implementing digital-to-analog converter (DAC) channels
• LED display backlight control systems

LED Driver IC Procurement Notes

Verify the specific suffix designation when ordering, as variants such as #PBF indicate tube packaging while #TRPBF indicates tape and reel configuration. Confirm that the component status is current, as some listings indicate this part may be obsolete. Ensure the selected variant matches the required supply chain logistics and handling specifications for the intended production environment.

LED Driver IC Selection Notes

Select the LT8500ETJ when a high-density solution requiring 48 independently controllable channels is necessary. The 12-bit resolution allows for fine-grained dimming control suitable for high-quality visual displays. Consider the 56-pin TLA QFN package constraints regarding thermal management and PCB layout space. The 3 V to 5.5 V operating range ensures compatibility with standard low-voltage logic and power rails.

LED Driver IC Part Context

The LT8500 series serves as a specialized LED driver IC within Analog Devices' portfolio, focusing on complex lighting control scenarios. The ETJ variant specifically denotes the commercial temperature grade version housed in a 56-lead Thin Low Profile Quad Flat No-Lead (TLA QFN) package. This component family addresses the need for centralized PWM generation in large-scale LED arrays without requiring external microcontrollers for each channel.

LED Driver IC FAQ

What is the resolution of the PWM registers in the LT8500ETJ?

Each of the 48 channels features an individually adjustable 12-bit PWM register, providing 4096 distinct steps for precise duty cycle control.

How does the LT8500ETJ handle brightness correction?

The device includes a 6-bit correction register for each channel, allowing for ±50% adjustment to compensate for LED variations or achieve specific luminance targets.