LM48557 Speaker Driver

Mono, Bridge-Tied Load, Ceramic Speaker Driver with I2C Volume Control and Reset - Now Available at Digi-Key

National Semiconductor's LM48557 is a single supply, mono, ceramic speaker driver with an integrated charge-pump designed for portable devices where board space is at a premium. It features high power supply rejection ratio, allowing the device to operate in noisy environments without additional power supply conditioning. In addition, its superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.      LM48557 Datasheet
National Semiconductor LM48557 Speaker Driver
  • Features & Applications
  • Diagram
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  • Integrated charge pump
  • Bridge-tied load output
  • Differential input
  • High PSRR
  • I2C volume and mode control
  • Reset input
  • Advanced click-and-pop suppression
  • Low supply current
  • Minimum external components
  • Micro-power shutdown
  • Available in space-saving 16-bump micro SMD package

  • Mobile phones
  • PDAs
  • Notebook electronic devices
  • MP3 players

  • RoHS Compliant

Typical Application Diagram

National Semiconductor LM48557 Speaker Driver Application Diagram

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 Available in Tape & Reel (TR-ND), Cut Tape (CT-ND), and custom Digi-Reel® (DKR-ND)
Part Number
National Semi
Part Number
Voltage - Supply
Output Type
Package / Case
2.7V ~ 4.5V
Depop, Differential Inputs,
I2C, Mute, Shutdown,
Volume Control