ADM8843: Four White LED Backlight Driver

ADM8843 Data Sheet Rev C, 01/2011 (pdf 372kB)

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Model	Package	Price* (100-499)	Price* 1000 pcs
ADM8843ACPZ-REEL7 Status: Production	16 ld LFCSP (3x3mm, 1.50mm exposed pad)	-	$0.50
ADM8843ACPZ1-R7 Status: Obsolete	16 ld LFCSP (3x3mm, 1.50mm exposed pad)	-	-

The ADM8843 uses charge pump technology to provide the power to drive up to four LEDs. The LEDs are used for back-lighting a color LCD display that has regulated constant current for uniform brightness intensity. The main display can use up to three LEDs, and the sub display uses one LED. The CTRL1 and CTRL2 digital input control pins control the shutdown opera-tion and the brightness of the main and sub displays.

To maximize power efficiency, the charge pump can operate in 1×, 1.5×, or 2× mode. The charge pump automatically switches among 1×/1.5×/2× modes, based on the input voltage, to maintain sufficient drive for the LED anodes at the highest power efficiency.

Improved brightness matching of the LEDs is achieved by a feedback pin that senses individual LED current with a typical matching accuracy of 0.3%.

Applications

Cellular phones with main and sub displays

White LED backlighting

Camera flash/strobes and movie light applications

Micro TFT color displays

DSC

PDAs

Data Sheet, Rev. B, 04/2010

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Product Updates: Notify Me

FEATURES and BENEFITS

Drives 4 LEDs from a 2.6 V to 5.5 V (Li-Ion) input supply
1×/1.5×/2× fractional charge pump to maximize power efficiency
0.3% typical LED current matching
Up to 88% power efficiency over Li-Ion range

Powers main and sub display LEDs with individual shutdown
Package footprint only 9 mm² (3 mm × 3 mm)
Package height only 0.55 mm
Low power shutdown mode
Shutdown function
Soft start limiting in-rush current

Functional Block Diagram for ADM8843

Typical Applications and Other Diagrams

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Documentation

Title	Content Type	File Type
ADM8843: Four White LED Backlight Driver Data Sheet (Rev C, 01/2011) (pdf, 372 kB)	Data Sheets	PDF
Isolating Power in Communication Bus and Gate Drive Applications Starting with a communications application overview of small power options through the process of selecting the right power products this webcast is a great resource for your communications applications designs.	Webcasts	WEBCAST
Innovative Power Reduction Techniques Enable Handset Manufacturers to Provide Media Rich Devices The demand for mobile devices with high-end features has been rapidly increasing. Features like text messaging, gaming, GPS navigation, web browsing and video playback on high resolution color displays are becoming the norm in today’s portable consumer electronics market. (LED Journal, August/September 2009)	Technical Articles	HTML
Programmable Medical Infusion Pumps Offer High Reliability and Performance	Technical Articles	HTML
ICs for Enhanced Handset User Experience	Overview	HTML
Charge Pump Application Bulletin (pdf, 970 kB) All new applications guide for charge pumps	Overview	PDF
Products for Wireless Handset Applications (pdf, 1441 kB)	Overview	PDF
Product Solutions for Handset Applications (pdf, 349 kB)	Overview	PDF
LEADING Semiconductors for Wireless Handsets Brochure (pdf, 1923 kB)	Overview	PDF
RAQs index	Rarely Asked Questions	HTML
Glossary of EE Terms	Glossary	HTML

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ADM8843 Model Options

Print Table

Model	Package	Pins	Temp. Range	Packing, Qty	Price*(100-499)	Price*1000 pcs	RoHS	View PCN/ PDN	Check Inventory/ Purchase/Sample
ADM8843ACPZ-REEL7 Status: Production	16 ld LFCSP (3x3mm, 1.50mm exposed pad)	16	Ind	Reel, 1500	-	$0.50	Y Material Info	Notify Me	Purchase Sample
ADM8843ACPZ1-R7 Status: Obsolete	16 ld LFCSP (3x3mm, 1.50mm exposed pad)	16	Ind	Reel, 1500	-	-	Y Material Info	Notify Me	Purchase

Price Table Help

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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

ADM8843 Evaluation Tools

Print Table

Model	Description	Price	RoHS	View PCN/ PDN	Check Inventory/ Purchase/Sample
ADM8843EB-EVALZ Status: Production	Evaluation Board	$156.35	Yes	-

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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ADM8843: Four White LED Backlight Driver