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2.8W, Low-EMI, Stereo, Filterless Class D Audio Amplifier

High-Efficiency Audio Amplifier Provides 2.8W of Power into a 4Ω Speaker

Product Details

The MAX9715 high-efficiency, stereo, Class D audio power amplifier provides up to 2.8W per channel into a 4Ω speaker with a 5V supply. Maxim's second-generation Class D technology features robust output protection, high efficiency, and high power-supply rejection (PSRR) while eliminating the need for output filters. Selectable gain settings, +10.5dB or +9.0dB, adjust the amplifier gain to suit the audio input level and speaker load.

The MAX9715 features high PSRR (71dB at 1kHz), allowing for operation from noisy supplies without additional regulation. Comprehensive click-and-pop suppression eliminates audible clicks and pops at startup and shutdown. The MAX9715 operates from a single 5V supply and consumes only 12mA of supply current. Integrated shutdown control reduces supply current to less than 100nA.

The MAX9715 is fully specified over the extended -40°C to +85°C temperature range and is available in thermally enhanced 16-pin TQFN-EP package.

Key Features

  • 5V Single-Supply Operation
  • Spread-Spectrum Modulator Reduces EMI
  • 2.8W, Class D, Stereo Speaker Amplifier (4Ω)
  • Filterless Class D Requires No LC Output Filter
  • High PSRR (71dB at 1kHz)
  • 86% Efficiency (RL = 8Ω, POUT = 1W)
  • Low-Power Shutdown Mode
  • Integrated Click-and-Pop Suppression
  • Low Total Harmonic Distortion: 0.06% at 1kHz
  • Short-Circuit and Thermal Protection
  • Internal Gain, +9.0dB or +10.5dB
  • Available in Space-Saving Packages
    • 16-Pin Thin QFN-EP (5mm x 5mm x 0.8mm)

Applications/Uses

  • High-End Notebook Audio
  • LCD Projectors
  • Multimedia Docking Stations
  • Portable Audio
Parametric specs for Speaker Amplifiers
# Channels 2
Class D
Spkr. Amp. VCC (V) (min) 4.5
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 12.8
POUT into 4Ω @ 1% THD+N (W) (min) 2.3
POUT into 4Ω @ 10% THD+N (W) (min) 2.8
POUT into 8Ω @ 1% THD+N (W) (min) 1.4
POUT into 8Ω @ 10% THD+N (W) (min) 1.5
Spkr. Amp. Half Pwr. THD+N (%) 0.09
SNR (dB) (A- Weighted) 93
PSRR (dB) (min) 71
Package/Pins TQFN/16
Budgetary
Price (See Notes)
$1.11 @1k
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Simplified Block Diagram

MAX9715: Block Diagram MAX9715: Block Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX9715 evaluation kit (EV kit) is a fully assembled and tested PC board that uses the MAX9715 filterless Class D amplifier to drive a pair of stereo bridge-tied-load (BTL) speakers in portable audio applications. Designed to operate from a 5V DC power supply, the EV kit is capable of delivering 2.3W per channel at 1% THD+N into a pair of 4Ω speaker loads. Three different output configurations are available for ease of evaluation.

The MAX9715 EV kit accepts single-ended input signals, and provides fully differential outputs. The EV kit also provides an option to select between 9dB or 10.5dB gains.

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Features

  • Filterless Operation
  • Passes FCC Radiated Emissions Specifications (with Short Cable Lengths)
  • 5V Single-Supply Operation
  • Fully Differential Outputs
  • Drives 2 x 2.3W into 4Ω Speakers at 1% THD+N
  • Selectable Gain
  • 0.1µA Shutdown Current
  • Small 16-Pin TQFN Package
  • Also Available in 16-Pin TSSOP
  • Fully Assembled and Tested

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Parameters

Parametric specs for Speaker Amplifiers
# Channels 2
Class D
Spkr. Amp. VCC (V) (min) 4.5
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 12.8
POUT into 4Ω @ 1% THD+N (W) (min) 2.3
POUT into 4Ω @ 10% THD+N (W) (min) 2.8
POUT into 8Ω @ 1% THD+N (W) (min) 1.4
POUT into 8Ω @ 10% THD+N (W) (min) 1.5
Spkr. Amp. Half Pwr. THD+N (%) 0.09
SNR (dB) (A- Weighted) 93
PSRR (dB) (min) 71
Package/Pins TQFN/16
Budgetary
Price (See Notes)
$1.11 @1k

Key Features

  • 5V Single-Supply Operation
  • Spread-Spectrum Modulator Reduces EMI
  • 2.8W, Class D, Stereo Speaker Amplifier (4Ω)
  • Filterless Class D Requires No LC Output Filter
  • High PSRR (71dB at 1kHz)
  • 86% Efficiency (RL = 8Ω, POUT = 1W)
  • Low-Power Shutdown Mode
  • Integrated Click-and-Pop Suppression
  • Low Total Harmonic Distortion: 0.06% at 1kHz
  • Short-Circuit and Thermal Protection
  • Internal Gain, +9.0dB or +10.5dB
  • Available in Space-Saving Packages
    • 16-Pin Thin QFN-EP (5mm x 5mm x 0.8mm)

Applications/Uses

  • High-End Notebook Audio
  • LCD Projectors
  • Multimedia Docking Stations
  • Portable Audio

Description

The MAX9715 high-efficiency, stereo, Class D audio power amplifier provides up to 2.8W per channel into a 4Ω speaker with a 5V supply. Maxim's second-generation Class D technology features robust output protection, high efficiency, and high power-supply rejection (PSRR) while eliminating the need for output filters. Selectable gain settings, +10.5dB or +9.0dB, adjust the amplifier gain to suit the audio input level and speaker load.

The MAX9715 features high PSRR (71dB at 1kHz), allowing for operation from noisy supplies without additional regulation. Comprehensive click-and-pop suppression eliminates audible clicks and pops at startup and shutdown. The MAX9715 operates from a single 5V supply and consumes only 12mA of supply current. Integrated shutdown control reduces supply current to less than 100nA.

The MAX9715 is fully specified over the extended -40°C to +85°C temperature range and is available in thermally enhanced 16-pin TQFN-EP package.

Simplified Block Diagram

MAX9715: Block Diagram MAX9715: Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal