A8516: LED Backlight Driver for LCD Monitors and Televisions

The A8516 is a multi-output WLED/RGB driver for backlighting LCD monitors and televisions. It integrates a boost controller to drive external MOSFET, and six internal currentsinks. The boost converter operates in constant frequency (programmable) current mode control.

The LED sink current is set by an external R_ISET resistor (see chart below). More than one LED sinks can be combined together to achieve even higher current per LED string.

The A8516 operates from a single supply of 8 to 24 V. It provides protection against overvoltage, open or shorted LED string, and overtemperature. A dual level cycle-by-cycle current limit function provides soft start and protects against overloads.

The device is provided in a 24-pin SOICW package (LB), with internally fused pins for enhanced thermal dissipation, and a 24-pin TSSOP package (LP), with an exposed thermal pad for enhanced thermal dissipation. All packages are lead (Pb) free, with 100% matte tin leadframe plating.

DATASHEETS
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Allegro MicroSystems, LLC (Allegro & Sanken Semiconductors) 
Phone: 267-373-9862
Fax: 215-957-5585
Cindy Painter, Email: cpainter@allegromicro.com

If this is not your local representative, find your local sales rep here.

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  • Six integrated high current sinks
  • Fixed frequency current mode control with integrated gate driver
  • 300 kHz to 1 MHz adjustable Boost switching frequency
  • Controlled startup using options of Enable, PWM signal, or battery voltage ramp
  • Active current sharing between LED strings for ±0.6% accuracy and matching
  • No audible MLCC noise during PWM dimming
  • Adjustable overvoltage protection (OVP)
  • Open or shorted LED string protection
  • Overtemperature, cycle-by-cycle current limit, and undervoltage protection
  • SOIC 24-pin package for easy single-side PCB manufacturing, or TSSOP 24-pin package with exposed thermal pad for better thermal performance

The device is provided in a 24-pin SOICW package (LB), with internally fused pins for enhanced thermal dissipation, and a 24-pin TSSOP package (LP), with an exposed thermal pad for enhanced thermal dissipation. All packages are lead (Pb) free, with 100% matte tin leadframe plating.

LB-SOIC 24 pin

LP TSSOP 24 pin

Click the image to view larger
A8516 Product Image Functional Block Diagram Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A8516ELBTR-T 24-lead SOIC -40°C to 85°C Yes View Data Contact your
local sales rep
Check stock
A8516ELPTR-T 24-lead TSSOP -40°C to 85°C Yes View Data Contact your
local sales rep
Check stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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