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
source：ShenZhen henlito electronic co.,ltd.
web:www.henlito.com
