MP1740 2.5-5.5V HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER

MP1740 2.5-5.5V HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER

The MP1740 is a high efficiency Class-D H- bridge audio amplifier.

Key Specifications

Features

• 3W Into 4Ω with 5 V Supply @ 10% THD+N
• Efficiency up to 90% at 1.7W Pout, 8 ohm load
• 2.5V to 5.5V Supply Voltage Operation
• THD+N = 0.1% @ 1.8W, 5V, 4Ω
• 2mA Quiescent current and 0.5μA shutdown current
• Full Bridge Output Drive
• Internal 250kHZ Switching frequency
• Fully Differential input
• Improved CMRR Eliminates Two Input Coupling Capacitors
• 1ms start-up time Eliminates pop

Typical Application Circuit

Applications

• Wireless or Cellular Handsets

Design Notes

• The output LC filter corner should sit well below the modulation frequency but above the audio band; component tolerance shifts it more than the nominal value suggests.
• Switching residuals on the speaker leads are best handled at layout — keep the filter close to the amplifier pins.
• Power supply rejection is frequency dependent, so a clean rail still matters at the modulation harmonics.
• The exposed pad is the thermal path; solder it to a copper area sized for continuous output power, not for idle.

Common Questions