A8435 Datasheet | Allegro MicroSystems

High Efficiency Charge Pump White LED Driver Features and Benefits - Proprietary adaptive control scheme (1×, 1.5×) - Maximum efficiency, over 92% - 0.5% LED current matching - 1 MHz operating frequency - Flexible dimming control: ▫ Serial 11-level dimming, down to 5% ▫ PWM ▫ 2-bit parallel - Drives up to 4 white LEDs - 30 m A per LED - 120 m A total continuous output - Low input ripple and EMI - Soft-start limits inrush current - Short circuit protection - Overvoltage protection - Thermal shutdown protection - Space-saving MLP-16 package: 3 × 3 mm footprint - Very thin 0.75 mm nominal height package Package: 16 pin QFN/MLP (suffix ES) Approximate Scale Description The A8435 high efficiency charge pump IC offers a simple, low-cost white LED driver solution for portable electronics display applications. Using a proprietary control scheme (1×, 1.5×), the A8435 can output well-matched currents for up to 4 LEDs, while maintaining the highest efficiency over most of the Li-ion battery lifetime. The A8435 accepts an input range of 2.7 to 5.5 V and delivers up to 30 m A for each of the four regulated current sources. The A8435 can deliver a total continuous output current of 120 m A, meeting the requirements of most Li-ion battery-powered white LED backlight applications. Outputs can also be tied together for WLED flash/torch applications. The A8435 offers flexible options for LED current driving. The LED current can be set by any of the following methods: (a) choosing an appropriate value for RSET, (b) 2-bit parallel control with 3 levels, (c) PWM control, or (d) serial programming The A8435 is available in a very thin profile 0.75 mm (nominal height) 3 × 3 mm QFN/MLP-16 package (ES), fitting the needs of space-conscious applications. Applications include: - White LED backlights for cellular phones, PDAs - Digital cameras, camcorders - Portable audio devices - Other portable device white LED...