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Small, Boosted, Digital Input Class-D Amplifier

Integrating a 3X Charge Pump Based Boost Delivers 9W Peak Power and Eliminates the Large and Expensive Inductors

Product Details

Key Features

Parametric specs for Speaker Amplifiers
# Channels 1
Class D
Spkr. Amp. VCC (V) (min) 3
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 1.5
POUT into 8Ω @ 1% THD+N (W) (min) 4.1
POUT into 8Ω @ 10% THD+N (W) (min) 4.85
Spkr. Amp. Half Pwr. THD+N (%) 0.006
SNR (dB) (A- Weighted) 108
PSRR (dB) (min) 60
Package/Pins WLP/24
Budgetary
Price (See Notes)
0
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Simplified Block Diagram

Technical Docs

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Parameters

Parametric specs for Speaker Amplifiers
# Channels 1
Class D
Spkr. Amp. VCC (V) (min) 3
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 1.5
POUT into 8Ω @ 1% THD+N (W) (min) 4.1
POUT into 8Ω @ 10% THD+N (W) (min) 4.85
Spkr. Amp. Half Pwr. THD+N (%) 0.006
SNR (dB) (A- Weighted) 108
PSRR (dB) (min) 60
Package/Pins WLP/24
Budgetary
Price (See Notes)
0

Key Features

  • Integrated Capacitive Boost Converter—No Bulky Inductors
  • 3.6W Output Power into 6Ω at VBAT = 3.7V
  • 10mW Total Quiescent Power
  • 3ms Turn-On Time 
  • 80% Efficiency (1.0W into RL = 8Ω, VBAT = 3.7V)
  • 19.8μVRMS Speaker Mode Output Noise 
  • 16.5μVRMS Receiver Mode Output Noise 
  • Low 0.005% THD+N at 1kHz
  • No MCLK Required
  • Sample Rates of 8kHz to 192kHz
  • Supports Left, Right, or (Left/2 + Right/2) Output in I2S and Left-Justified Modes
  • Sophisticated Edge Rate Control Enables Filterless Class-D Outputs
  • Low RF Susceptibility Rejects TDMA Noise from GSM Radios
  • Class-D Switching Frequency Trimmed to 10% for Better EMI Planning
  • Extensive Click-and-Pop Reduction Circuitry
  • Dynamic Headroom Tracking (DHT)
  • Robust Short-Circuit and Thermal Protection
  • Available in Space-Saving Package: 1.468mm x 2.138mm, 24-Bump WLP (0.35mm Pitch) 

Applications/Uses

  • Smartphones
  • Smart Speakers
  • IoT Devices
  • Tablets

Description

The MAX98380 is a small, mono Class-D audio amplifier featuring an integrated capacitive boost converter. The device implements a tripler charge pump-based boost converter that efficiently delivers up to 4.85W at 1% THD+N into an 8Ω load. The capacitive boost replaces the large and expensive inductor required for an inductive boost with smaller, lower-profile capacitors that reduce the total PCB solution.

Additionally, as the power-supply voltage varies due to declining battery life, an on-chip limiter (DHT) automatically optimizes the headroom available to the Class-D amplifier to maintain consistent distortion and listening levels.

Thermal-foldback protection ensures robust behavior when the thermal limits of the device are reached. When enabled, it automatically reduces the output power when the temperature exceeds a user-specified threshold. This allows for uninterrupted music playback even at high ambient temperatures. Traditional thermal protection is also available in addition to robust overcurrent protection.

The device provides a PCM interface for audio data and a standard I2C interface for control data communication. The PCM interface supports audio playback using I2S, left-justified, and TDM audio data formats. A unique clocking structure eliminates the need for an external master clock for PCM communication. This reduces EMI and possible board coupling issues in addition to reducing the size and pin count.

Active emissions-limiting and edge-rate limiting circuitry greatly reduce EMI. A filterless spread-spectrum modulation scheme eliminates the need for output filtering found in traditional Class-D devices and reduces the component count of the solution.

The IC is available in a 0.35mm pitch 24-bump wafer-level package (WLP). It is specified over the extended, -40°C to +85°C temperature range.

Simplified Block Diagram

MAX98380: Simplified Block Diagram MAX98380: Simplified 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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.