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MAX8678 - White LED Charge Pump

Datasheet Summary

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.

Features

  • High-Efficiency White LED Charge Pump Individual Adaptive Supply for Each LED 4 Low-Dropout LED Current Regulators 24mA to 0.1mA 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 1kHz High 90dB PSRR at 1kHz Fully Differential Inputs -9dB to +18dB Gain Settings in 3dB Steps Integrated Click/Pop Suppression Low Quiescent Current.

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Datasheet preview – MAX8678

Datasheet Details

Part number MAX8678
Manufacturer Maxim Integrated Products
File Size 294.95 KB
Description White LED Charge Pump
Datasheet download datasheet MAX8678 Datasheet
Additional preview pages of the MAX8678 datasheet.

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Full PDF Text Transcription

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www.DataSheet4U.com 19-0786; Rev 0; 4/07 White LED Charge Pump with 1.1W Audio Amplifier General 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 0.1mA/LED to 24mA/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.
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