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MAX9738
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


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Description
FULL DATA SHEET (PDF, 336kB)
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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.

Key Features   Applications/Uses
  • 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)

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

    Key Specifications:   Speaker Amplifiers
    Part Number Class Speaker Amp. VCC (min) (V) Speaker Amp. VCC (max) (V) Speaker Amp. ICC (typ) (mA) POUT into 8Ω @ 1% THD+N (W) Speaker Amp. Half Pwr. THD+N (%) SNR, A-weighted (dB) PSRR (db) Speaker Amp. External Gain Features Number of Channels Price**
    MAX9738  Boosted/G 2.7 5.5 16.5 0.25 0.07 95 70 Yes
    Differential Inputs
    Wide Supply Range
    1 $0.62 @ 1k
    See All Speaker Amplifiers (30)
    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 prices and delivery, please see the price and availability page or contact an authorized distributor.

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    Document Ref.: 19-3700; Rev 0; 2008-04-03
    This page last modified: 2008-10-29


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