MAX8678 Datasheet | Maxim Integrated

Description The MAX8678 integrates a charge pump for white lightemitting diodes (LEDs) with an audio loudspeaker amplifier. The high-efficiency, adaptive charge pump drives up to four LEDs with constant current for uniform brightness. The LED current is adjustable from 0.1m A/LED to 24m A/LED in 31 pseudo-logarithmic steps through a single-wire serial-pulse interface. High accuracy and LED-to-LED current matching are maintained throughout the adjustment range. Individual adaptive mode switching for each LED provides high efficiency with a wide range of LED forward voltages. The mono class AB audio amplifier directly drives an 8Ω loudspeaker with 1.1W RMS continuous power from a 5V supply with less than 1% THD+N. The gain is adjustable from -9d B to +18d B in ten 3d B steps through a singlewire serial-pulse interface. Clicks and pops are suppressed during on/off and all gain adjustments. Differential inputs improve mon-mode noise rejection. The MAX8678 includes soft-start, thermal shutdown, open-circuit and short-circuit protection, and is available in the 16-pin, 3mm x 3mm Thin QFN package (0.8mm max height). Features - High-Efficiency White LED Charge Pump Individual Adaptive Supply for Each LED 4 Low-Dropout LED Current Regulators 24m A to 0.1m A Dimming Range Single-Wire, Serial-Pulse Dimming Interface 1% (typ) Accuracy Low 140µA Quiescent Current - Mono Class AB Audio Amplifier 1.1W RMS Mono BTL Output (8Ω, VIN = 5V) Low 0.004% THD+N at 1k Hz High 90d B PSRR at 1k Hz Fully Differential Inputs -9d B to +18d B Gain Settings in 3d B Steps Integrated Click/Pop Suppression Low Quiescent Current - Soft-Start Limits Inrush Current - Thermal Shutdown, Open- and Short-Circuit Protection - 16-Pin, 3mm x 3mm Thin QFN Package Ordering Information PART MAX8678ETE+ PIN-PACKAGE 16 Thin QFN 3mm x 3mm TOP MARK AFF PKG CODE T1633-5 Applications Cell Phones and Smartphones Camera Phones PDAs, Digital Cameras, Camcorders +Denotes a lead-free package. Typical Operating...