LT8500 -48-Channel LED PWM Generator with 12-Bit Resolution and 50MHz Cascadable Serial Interface

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

Typical Application

LT8500 Typical Application

Description

The LT®8500 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT8500ETJ#PBF 6x6 QFN-56 TLA QFN E 05-08-1968 Yes
LT8500ETJ#TRPBF 6x6 QFN-56 TLA QFN E 05-08-1968 Yes
LT8500ITJ#PBF 6x6 QFN-56 TLA QFN I 05-08-1968 Yes
LT8500ITJ#TRPBF 6x6 QFN-56 TLA QFN I 05-08-1968 Yes


LT8500 Package Drawing
LT8500 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT8500ETJ#PBF 6x6 QFN-56 E $4.22 $2.95 Yes
LT8500ETJ#TRPBF 6x6 QFN-56 E $3.01 Yes
LT8500ITJ#PBF 6x6 QFN-56 I $4.64 $3.25 Yes
LT8500ITJ#TRPBF 6x6 QFN-56 I $3.31 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1552A LT8500EUHH/LT3595AEUHH Demo Board | 48-Channel LED Driver (3x LT3595A) with PWM Generator (LT8500)and Serial Interface $225.00
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Click here to view our complete list of demo boards

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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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice IV - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

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