Audio Subsystem with Mono Class D Speaker and Class H Headphone Amplifiers

2mm x 2.5mm, 20-Bump WLP Audio Subsystem with Limiter and Industry's Best Class D Speaker and Class H Headphone Amplifiers


The MAX97002 mono audio subsystem combines a mono speaker amplifier with a stereo headphone amplifier and an analog DPST switch. The headphone and speaker amplifiers have independent volume control and on/off control. The 4 inputs are configurable as 2 differential inputs or 4 single-ended inputs.

The entire subsystem is designed for maximum efficiency. The high-efficiency, 700mW, Class D speaker amplifier operates directly from the battery and consumes no more than 1µA in shutdown mode. The Class H headphone amplifier utilizes a dual-mode charge pump to maximize efficiency while outputting a ground-referenced signal that does not require output coupling capacitors.

The speaker amplifier incorporates a distortion limiter to automatically reduce the volume level when excessive clipping occurs. This allows high gain for low-level signals without compromising the quality of large signals.

All control is performed using the 2-wire I²C interface. The MAX97002 operates over the extended -40°C to +85°C temperature range, and is available in the 2mm x 2.5mm, 20-bump WLP package (0.5mm pitch).
MAX97002: Simplified Block Diagram MAX97002: Simplified Block Diagram Enlarge+

Key Features

  • 2.7V to 5.5V Speaker Supply Voltage
  • 1.6V to 2V Headphone Supply Voltage
  • 700mW Speaker Output (VPVDD = 3.7V, ZSPK = 8Ω + 68µH)
  • 37mW/Channel Headphone Output (RHP = 16Ω)
  • Low-Emission Class D Amplifier
  • Efficient Class H Headphone Amplifier
  • Ground-Referenced Headphone Outputs
  • 2 Stereo Single-Ended/Mono Differential Inputs
  • Integrated Distortion Limiter (Speaker Outputs)
  • Integrated DPST Analog Switch
  • No Clicks and Pops
  • TDMA Noise Free
  • 2mm x 2.5mm, 20-Bump, 0.5mm Pitch WLP Package


  • Cell Phones
  • Portable Multimedia Players
Part Number Functions Class Spkr. Amp. VCC
Spkr. Amp. VCC
Spkr. Amp. ICC
Spkr. Amp. POUT
Spkr. Amp. Half Pwr. THD+N
Hdph. Amp. VCC
Hdph. Amp. VCC
Hdph. Amp. ICC
Hdph. Amp. POUT into 32Ω
Hdph. Amp. Half Pwr. THD+N
min max typ min max typ @ 1% THD+N See Notes
MAX97002  Mobile Communication Subsystem D 2.7 5.5 1.38 0.92 0.05 1.6 2 1.7 0.03 0.02 $0.83 @1k
See All Integrated Amplifiers (11)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX97002EVKIT: Evaluation Kit for the MAX97002

Quality and Environmental Data

Request Reliability Report for: MAX97002 
Lead-Free Package Tin (Sn) Whisker Reports

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