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Boosted 2.2W Class D Amplifier with Automatic Level Control

Delivers Constant 2.2W Output Power Without Collapsing Battery

Product Details

Key Features

Applications/Uses

Parametric specs for Speaker Amplifiers
# Channels 1
Class D
Spkr. Amp. VCC (V) (min) 2.5
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 3.7
POUT into 4Ω @ 1% THD+N (W) (min) 3.4
POUT into 4Ω @ 10% THD+N (W) (min) 4.1
POUT into 8Ω @ 1% THD+N (W) (min) 1.7
POUT into 8Ω @ 10% THD+N (W) (min) 2.2
Spkr. Amp. Half Pwr. THD+N (%) 0.04
SNR (dB) (A- Weighted) 102
PSRR (dB) (min) 95
Package/Pins WLP/16
Budgetary
Price (See Notes)
0.8
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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) 2.5
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 3.7
POUT into 4Ω @ 1% THD+N (W) (min) 3.4
POUT into 4Ω @ 10% THD+N (W) (min) 4.1
POUT into 8Ω @ 1% THD+N (W) (min) 1.7
POUT into 8Ω @ 10% THD+N (W) (min) 2.2
Spkr. Amp. Half Pwr. THD+N (%) 0.04
SNR (dB) (A- Weighted) 102
PSRR (dB) (min) 95
Package/Pins WLP/16
Budgetary
Price (See Notes)
0.8

Key Features

  • Boosted Class D Output
  • Integrated Automatic Level Control
  • Output Power
    • 2.2W into 8Ω, 10% THD+N
    • 1.7W into 8Ω, 1% THD+N
    • 4.1W into 4Ω, 10% THD+N
    • 3.4W into 4Ω, 1% THD+N
  • Wide 2.5V to 5.5V Supply Voltage Range
  • Undervoltage Lockout Protection
  • High Total Efficiency of 87%
  • High Step-Up Switching Frequency (2MHz)
  • Active Emission Limiting for Low EMI

Applications/Uses

  • Active Speaker Accessories
  • Cell Phones
  • GPS Devices
  • Mobile Internet Devices
  • Smartphones

Description

The MAX98502 is a high-efficiency, Class D audio amplifier that features an integrated boost converter to deliver a constant output power over a wide range of battery supply voltages.

The boost converter operates at 2MHz, requiring only a small (2.2µH) external inductor and capacitor.

The automatic level control has a battery tracking function that reduces the output swing as the supply voltage drops, preventing collapse of battery voltage.

The amplifier has differential inputs and an internal fully differential design. The MAX98502 also features three gain settings (6dB, 15.5dB, and 20dB) that are selectable with a logic input.

The MAX98502 is available in a small, 0.5mm pitch 16-bump WLP package (2.1mm x 2.1mm). It is specified over the extended -40°C to +85°C temperature range.

Simplified Block Diagram

MAX98502: Simplified Block Diagram MAX98502: 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 .