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Related Links:

Datasheets:
A8434: 6-Channel High Efficiency Charge Pump White LED Driver (PDF)

Selection Guides:
Power Management ICs,

Power Management ICs: Display Power and Backlight

when this product is updated

Press Releases:
A8434: Allegro Microsystems, Inc. Announces New Six-Channel Charge Pump White LED Driver

A8434
6-Channel High Efficiency Charge Pump White LED Driver for Main and Sub Displays

Features

• Proprietary adaptive control scheme (1×, 1.5×, 2×)
• 0.5% typical WLED current matching
• Drives up to 6 white LEDs
  • Main display backlight (up to 6 WLEDs)
  • Main display and sub display backlight
  • Main display and low-current flash/torch
• 30 mA per WLED
• 2 serial dimming interfaces
• 320 mA charge pump capability
• Low EMI design and soft start function
• Short circuit, overvoltage, thermal shutdown protection
• 0.75 mm very thin profile 3×3 mm packages

Applications

• White LED backlights for cellular phones, PDAs
• Digital cameras, camcorders
• Portable audio devices and MP3 players
• Other portable device white LED backlighting

Description

The A8434 high efficiency charge pump ICs offer a simple, low-cost WLED (white LED) driver solution for driving up to six WLEDs in various application configurations, either all six backlighting a single display, or for multiple displays, such as four WLEDs as the main display backlight, with the other two WLEDs used for backlighting a sub display or a low-current flash/torch. Using a proprietary control scheme (1×, 1.5×, and 2×), the A8434 can deliver well-matched WLED current while maintaining the highest efficiency and low EMI.

The WLED current is regulated over the entire range of Li+ battery voltage to provide uniform intensity. WLED brightness and on/off can be controlled for the main display and sub display/torch through 2 single-wire serial interface pins.

The A8434 is available in an MLP/QFN-16 space-conserving (3×3 mm footprint) ES package.

Evaluation tool and reference design are available for this device. For more information, contact us.

Typical Applications

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A8434EESTR-T	16-lead QFN	Yes	view data	-40 °C to  85 °C	new	Due to warehouse relocation, samples will be unavailable until August 1, 2008. Contact your sales rep or purchase from distributor.

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.