ADM8843

PRODUCTION

ADM8843

Four White LED Backlight Driver

PRODUCTION

Part Details

ADM8843 Typical Application Diagram slide

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1ku List Price Starting From $0.67

Features

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 0.75 mm
Low power shutdown mode
Shutdown function
Soft start limiting in-rush current

Additional Details

The ADM8843 uses charge pump technology to provide the power to drive up to four LEDs. The LEDs are used for backlighting 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 operation 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

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $0.67

Documentation

Technical Documents 2

ADM8843: Four White LED Backlight Driver Data Sheet (Rev.E) 01/04/2011

ADM8843 Evaluation Tools (EVAL-ADM8843) 06/01/2005

Design Resources 2

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
ADM8843ACPZ-REEL7	16-Lead LFCSP (3mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
ADM8843ACPZ1-R7	16-Lead LFCSP (3mm x 3mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

ADM8843ACPZ-REEL7
Pin/Package Drawing
16-Lead LFCSP (3mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

ADM8843ACPZ1-R7
Pin/Package Drawing
16-Lead LFCSP (3mm x 3mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Feb 13, 2014

- 14_0038

Conversion of 3x3mm body Size LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines.

ADM8843ACPZ-REEL7

PRODUCTION

pdf

PCN14_0038_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Package Outline Drawing

pdf

Qualification Report Summary

Filter by Model

Part Models

Product Lifecycle

PCN

Feb 13, 2014

- 14_0038

Conversion of 3x3mm body Size LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines.

ADM8843ACPZ-REEL7

PRODUCTION

pdf

PCN14_0038_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Package Outline Drawing

pdf

Qualification Report Summary

Software & Part Ecosystem

Evaluation Kit

EVAL-ADM8843

ADM8843 Evaluation Tools

EVAL-ADM8843

ADM8843 Evaluation Tools

Features and Benefits

ADM8843 drives 4 white LEDs from a 2.6V to 5.5V (li-ion) input supply
1x/1.5x/2x Fractional Charge Pump to maximize power efficiency
0.3% Typ LED Current Matching
Power Sub and main Display LEDs
Low Power Shutdown Mode
Package footprint only 9mm2 (3mm x 3mm)
Package height only 0.9mm
Shutdown Function
Soft-start limiting inrush current

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Product Detail

The ADM8843 provides two digital input control pins, CTRL1 and CTRL2, which control the operation and the brightness of the LEDs. The ADM8843 is configured with a sub and main display, the main display refers to 3 of the 6 LEDs (FB1 – FB3) and the sub display refers to the remaining LED (FB54).

The ADM8843 provides the option to control the brightness of the LEDs with a digital PWM signal. The duty cycle of the PWM signal determines the brightness of the backlight LEDs. Brightness control of the LEDs can also be controlled by a DC voltage. The ADM8843 has soft-start circuitry to limit inrush current flow at power up.

The ADM8843 is fabricated using CMOS technology for minimal power consumption. The part is packaged in a 16-lead LFCSP (Lead Frame Chip Scale Package).

Resources

pdf

ADM8843 Evaluation Tools (EVAL-ADM8843)