LM4675SD/NOPB

The LM4675SD/NOPB is a single supply high efficiency mono class D Audio Amplifier. A spread spectrum, filterless PWM architecture reduces EMI and eliminates the output filter, reducing external component count, board area consumption and simplifying design. The LM4675 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4Ω speaker load at a continuous average output of 2.2W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4 to 5.5V. The wide band spread spectrum architecture of the LM4675 reduces EMI-radiated emissions due to the modulator frequency. The LM4675 has high efficiency with speaker loads compared to a typical class AB amplifier. With a 3.6V supply driving a 8Ω speaker, the IC's efficiency for a 100mW power level is 80%, reaching 89% at 400mW output power. The LM4675 features a low-power consumption shutdown mode.

• Spread spectrum architecture reduces EMI
• No output filter required for inductive loads
• Externally configurable gain
• Minimum external components
• Click and pop suppression circuitry
• Micro-power shutdown mode
• 17μs (typical) Very fast turn on time
• Green product and no Sb/Br

Applications

Audio, Consumer Electronics, Portable Devices