LT8500

RECOMMENDED FOR NEW DESIGNS

LT8500

48-Channel LED PWM Generator with 12-Bit Resolution and 50MHz Cascadable Serial Interface

RECOMMENDED FOR NEW DESIGNS

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Part Models 4

1ku List Price Starting From $4.18

Features

3V to 5.5V Input Voltage
48 Independent PWM Outputs
TTL/CMOS Logic 50MHz Serial Data Interface
12-Bit (4096 Steps) PWM Width Resolution
6-Bit (64 Steps) PWM Correction (±50% of Programmed PWM Width)
Up to 6.1kHz PWM Frequency (PWMCK = 25MHz)

Phase-Shift Option Reduces Switching Noise
Directly Controls Three LT3595A 16-Channel LED Drivers
Diagnostic Information: Sync Error/Open LED Flags
56-Pin (6mm × 6mm × 0.78mm) TLA QFN Package

Additional Details

The LT8500 is a pulse width modulation (PWM) generator with 48 independent channels. Each channel has an individually adjustable 12-bit (4096-step) PWM register and a 6-bit (64-step) ±50% correction register. All controls are programmable via a simple serial data interface. Three banks of 16-channels each can be configured such that they operate 120° out-of-phase with each other.

The LT8500 features two diagnostic information flags: synchronization error and open LED. The flags are sent, with additional state information, on the serial data interface during status read back. The 50MHz cascadable serial data interface includes buffering and skew-balancing, making the chip suitable for PWM intensive applications such as large screen LCD dynamic backlighting and mono-, multi- and full-color LED displays. The LT8500 is also ideally suited to control three LT3595A LED drivers.

Applications

Large Screen Display LED Backlighting
Mono-, Multi-, Full-Color LED Displays
LED Billboards and Signboards
Motor Control
Industrial Control
Automated Test Equipment
Robotics

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

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FAQs

Sales & Ordering FAQs

Part Models 4

1ku List Price Starting From $4.18

Technical Documents 2

LT8500: 48-Channel LED PWM Generator with 12-Bit Resolution and 50MHz Cascadable Serial Interface Data Sheet (Rev.C) 06/08/2016

DC1552A - Demo Manual 01/25/2012

Reference Materials 1

MIKROE-3148, Click Board, PWM 2 Click

Design Resources 4

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT8500ETJ#PBF	56-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8500ETJ#TRPBF	56-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8500ITJ#PBF	56-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LT8500ITJ#TRPBF	56-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LT8500ETJ#PBF
Pin/Package Drawing
56-Lead QFN (6mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT8500ETJ#TRPBF
Pin/Package Drawing
56-Lead QFN (6mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT8500ITJ#PBF
Pin/Package Drawing
56-Lead QFN (6mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LT8500ITJ#TRPBF
Pin/Package Drawing
56-Lead QFN (6mm x 6mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

DC1552A

LT8500EUHH/LT3595AEUHH Demo Board | 48-Channel LED Driver (3× LT3595A) with PWM Generator (LT8500) and Serial Interface

LT8500EUHH/LT3595AEUHH Demo Board | 48-Channel LED Driver (3× LT3595A) with PWM Generator (LT8500) and Serial Interface

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DC1552A

LT8500EUHH/LT3595AEUHH Demo Board | 48-Channel LED Driver (3× LT3595A) with PWM Generator (LT8500) and Serial Interface

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Product Detail

Demonstration circuit 1552 showcases the LT8500, a 48-channel PWM generator and serial interface. It operates from a 30V to 45V input power supply and drives 48 channels of LED strings at 30mA and up to 32V each, although it can be adjusted for 50mA per string. The LT8500 drives 48 PWM channels that are tied directly to the PWM inputs of three separate LT3595A 16-channel step-down LED drivers. Each LED Driver can operate up to 45V input and provide up to 50mA LED current per channel.

The input to the LT8500 is a serial interface that can run up to 50MHz. The DC1552A has both an input and output connector and can be cascaded in a chain of two or more while being driven from a single serial interface.

Resources

ZIP

DC1552A - Design Files