A8500: Flexible WLED/RGB Backlight Driver for Medium Size LCDs

The A8500 is a multi-output WLED driver for medium display backlighting. The A8500 integrates a boost converter and eight current-sinks to provide a flexible WLED/RGB backlight driver. The boost converter can provide output voltage up to 47 V. The flexible channel selection control and high voltage capability allow a wide range of LED backlight applications. The A8500 can support any application requiring 4 to 96 WLEDs. The boost converter is a constant frequency current-mode converter.

Each LED channel can sink 25 mA, and channels can be paralleled for higher currents. Flexible dimming allows output channels to either run at an adjustable DC value or with externally controlled PWM duty cycles.

The A8500 is available in a 26 pin, 4 mm × 4 mm QFN/MLP package that is only 0.75 mm nominal in height.

Applications include:

Thin notebook displays
LCD TV
RGB backlight
GPS systems
Portable DVD players

DATASHEETS

A8500 Datasheet

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Active current sharing between LED strings for ±1.5% typical current matching and ±1.2% typical accuracy
Drive up to 12 series × 8 parallel = 96 LEDs (V_f = 3.2 V, I_f = 20 mA)
Flexible dimming, using alternative methods:

LED duty cycle control (PWM pin)
DC current using serial programming (EN pin)
DC current using external PWM signal (APWM pin)
An external resistor

Boost converter with integrated 50 V, 2 A DMOS
LED sinks rated for 25 mA
200 kHz to 2 MHz switching frequency
Open LED disconnect
Boost current limit, thermal shutdown, and soft start
No audible ceramic capacitor noise during PWM dimming
Adjustable overvoltage protection (OVP)
No pull-up resistors required for LED modules that use ESD capacitors

The A8500 is available in a 26 pin, 4 mm × 4 mm QFN/MLP package that is only 0.75 mm nominal in height (suffix EC).

EC QFN/MLP with exposed pad 26 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
A8500EECTR-T	26-lead QFN/MLP	-40 ° C to 85 ° C	Yes	View Data		Contact your local sales rep	Check Distributor Stock
A8500GECTR-T	26-lead QFN/MLP	-40 ° C to 105 ° C	--	--		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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A8500: Flexible WLED/RGB Backlight Driver for Medium Size LCDs

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.