The A8434 is a high-efficiency charge pump IC that offers a simple, low-cost white LED driver solution for driving up to six WLEDs in various application configurations. It can be used to backlight a single display with all six LEDs or to backlight multiple displays, such as using four LEDs for the main display and the other two for a sub display or flash/torch. The A8434 utilizes a proprietary control scheme (1×, 1.5×, and 2×) to deliver well-matched WLED current while maintaining high efficiency and low EMI. The WLED current is regulated over the entire range of Li+ battery voltage to provide uniform intensity. The brightness and on/off of the WLEDs for the main display and sub display/torch can be controlled through 2 single-wire serial interface pins. The A8434 is available in a space-conserving QFN/MLP-16 ES package with a 3×3 mm footprint. Applications include white LED backlights for cellular phones, PDAs, digital cameras, camcorders, portable audio devices, and MP3 players.
The A8434 is a high‑efficiency charge‑pump IC designed to drive up to six white LEDs for backlighting displays, sub‑displays, flash or torch applications. It features a proprietary adaptive control scheme (1×, 1.5×, 2×) that provides tight current matching (0.5 % typical) while maintaining low EMI and a thin 0.75 mm profile in a 3 × 3 mm QFN/MLP package.
Typical applications include white‑LED backlights for cellular phones, PDAs, digital cameras, camcorders and portable audio devices. The device offers overvoltage protection up to 4.9 V, short‑circuit and thermal‑shutdown protection, and supports dimming via a single‑wire serial interface on the ENM and ENS pins.
| Charge Pump Capability | 320 mA |
|---|---|
| Number of Channels | 6 |
| Maximum LED Current per Channel | 30 mA |
| Overvoltage Protection | Up to 4.9 V |
It can drive up to six white LEDs.
The driver limits each LED to about 30 mA.
It provides short‑circuit, overvoltage (up to 4.9 V) and thermal‑shutdown (165 °C) protection.