A8507: LED Backlight Driver for LCD Monitors and Televisions

The A8507 is a multi-output WLED/RGB driver for backlighting LCD monitors and televisions. The A8507 integrates a boost controller to drive external MOSFET and six internal current-sinks. The boost converter is constant frequency current mode converter.

PWM dimming allows LED currents to be controlled in 500:1 ratio. The LED sinks are capable of sinking up to 80 mA each, and can be paralleled together to achieve even higher currents.

The A8507 provides protection against overvoltage, open or shorted LED string, and overtemperature. A dual level cycleby- 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. Both packages are lead (Pb) free, with 100% matte tin leadframe plating.

DATASHEETS

A8507 Datasheet

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Fixed frequency current mode control with integrated gate driver
Each individual current sink is capable of 80 mA
Adjustable overvoltage protection (OVP)
Active current sharing between LED strings for ±0.6% accuracy and matching
250 kHz to 1 MHz adjustable switching frequency
Open or shorted LED string protection
Overtemperature, cycle-by-cycle current limit, and undervoltage protection
No audible MLCC noise during PWM dimming
No pull-up resistors required for LED modules that use ESD capacitors
SOIC 24-pin package for easy single-side PCB manufacturing or TSSOP 24-pin package with exposed thermal pad for better thermal performance

LB-SOIC 24 pin LP-eTSSOP 24 lead

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Part Number Specifications and Availability
Part Number	Package Type	Temperature	RoHS Compliant	Part Composition / RoHS Data	Comments	Samples	Check Distributor Stock
A8507ELBTR-T	24-lead SOIC	-40 ° C to 85 ° C	Yes	View Data	New	Contact your local sales rep	Check Distributor Stock
A8507ELPTR-T	24-lead TSSOP	-40 ° C to 85 ° C	Yes	View Data	New	Contact your local sales rep	Check Distributor Stock

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.

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A8507: LED Backlight Driver for LCD Monitors and Televisions

Part Number Specifications and Availability

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.