A8434

• 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

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.