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16VP-P Class G Amplifier with Inverting Boost Converter

Industry's Smallest Inductor-Based Boost Solution to Drive Ceramic Speakers
from a Li-Ion Battery

Product Details

Key Features

Parametric specs for Speaker Amplifiers
# Channels 1
Class Boosted/G
Spkr. Amp. VCC (V) (min) 2.7
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 16.5
POUT into 8Ω @ 1% THD+N (W) (min) 0.25
Spkr. Amp. Half Pwr. THD+N (%) 0.07
SNR (dB) (A- Weighted) 95
PSRR (dB) (min) 70
Package/Pins WLP/20
Budgetary
Price (See Notes)
1.56
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Simplified Block Diagram

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Parameters

Parametric specs for Speaker Amplifiers
# Channels 1
Class Boosted/G
Spkr. Amp. VCC (V) (min) 2.7
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 16.5
POUT into 8Ω @ 1% THD+N (W) (min) 0.25
Spkr. Amp. Half Pwr. THD+N (%) 0.07
SNR (dB) (A- Weighted) 95
PSRR (dB) (min) 70
Package/Pins WLP/20
Budgetary
Price (See Notes)
1.56

Key Features

  • Integrated Inverting Boost Converter
  • 2.7V to 5.5V Single-Supply Operation
  • 16VP-P Output Voltage Swing, Ideal for Driving a Ceramic Speaker
  • Maintains Output Voltage Swing as the Battery Decays
  • Clickless/Popless Operation
  • Small, Thermally Efficient 5x4 WLP Package (2.5mm x 2mm)

Applications/Uses

  • Cellular Phones
  • Handheld Gaming Consoles
  • MP3 Players
  • Notebook Computers
  • Personal Media Players
  • Smartphones

Description

The MAX9738 features a mono Class G power amplifier with an integrated inverting boost converter. The Class G amplifier is specifically designed to drive the high capacitance of a ceramic/piezoelectric loud-speaker. The inverting boost converter can typically supply up to 400mA of peak output current, allowing for a constant output of 16VP-P over the 2.7V to 5.5V supply voltage range.

The MAX9738 maximizes battery life by offering high-performance efficiency. Maxim’s proprietary output stage provides efficiency levels greater than Class AB devices without the EMI penalties commonly associated with Class D amplifiers.

The MAX9738 is ideally suited to deliver the high output voltage swing required to drive ceramic/piezoelectric speakers.

The device utilizes fully differential inputs and outputs, comprehensive click-and-pop suppression, shutdown control, and soft-start circuitry. The MAX9738 is fully specified over the -40°C to +85°C extended temperature range and is available in an ultra-small, lead-free 5x4 WLP (2.5mm x 2mm) package.

Simplified Block Diagram

MAX9738: Simplified Block Diagram MAX9738: 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 .