Texas Instruments LM4673 Class D Audio Power Amplifier
Texas Instruments LM4673 Class D Audio Power Amplifier is a single supply, high efficiency, 2.65W, mono, Class D audio amplifier. A low noise, filterless PWM architecture eliminates the output filter. This architecture reduces the external component count, board area consumption, system cost, and simplifies the design. The LM4673 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 2.1W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V.
Features
- Mono class D operation
- No output filter required for inductive loads
- Externally configurable gain
- 17μs (typ) Very fast turn-on time
- Minimum external components
- "Click and Pop" suppression circuitry
- Micro-power shutdown mode
- Available in space-saving 0.4mm pitch DSBGA and WSON packages
- Efficiency at 3.6V, 400mW into 8Ω speaker 88% (typ)
- Efficiency at 3.6V, 100mW into 8Ω speaker 80% (typ)
- Efficiency at 5V, 1W into 8Ω speaker 86% (typ)
- Quiescent current, 3.6V supply 2.1mA (typ)
- 0.01µA (typ) Total shutdown power supply current
- Single supply range 2.4V to 5.5V
- PSRR, f = 217Hz 78dB
Applications
- Mobile phones
- PDAs
- Portable electronic devices
Publicado: 2016-03-30
| Actualizado: 2022-03-11