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Mono 7W Class D Amplifier

Direct-from-Battery 7W Class D Amplifier Slashes Notebook 2.1 Solution Cost
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Status Explanations for product status codes

Active: In Production.


The MAX9737 mono 7W Class D amplifier provides a high-performance, thermally efficient amplifier solution that offers up to 88% efficiency at a 12V supply. The device operates from 8V to 28V and provides a high 80dB PSRR, eliminating the need for a regulated power supply.

Filterless modulation allows the MAX9737 to pass CE EMI limits with 1m cables using only a low-cost ferrite bead and small-value capacitor on each output.

Comprehensive click-and-pop suppression circuitry reduces noise on power-up/down or into and out of shutdown or mute.

An input op amp allows the user to create a lowpass or highpass filter, and select an optimal gain. The internal precharge circuit ensures clickless/popless turn-on within 10ms.

The MAX9737 is available in the 24-pin, TQFN-EP package and is specified over the -40°C to +85°C temperature range.

Data Sheet

Download this datasheet in PDF formatDownload Rev 0 (PDF, 360kB)
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An evaluation board is available: MAX9737EVKIT

Key Features

  • 8V to 28V Supply Voltage Range
  • Spread-Spectrum Modulation Enables Low-EMI Solution
  • Passes EMI Limit with Up to 1m of Speaker Cable
  • High 80dB PSRR
  • Up to 88% Efficiency Eliminates Heatsink
  • Thermal and Output Current Protection
  • < 1µA Shutdown Mode
  • Click-and-Pop Suppression
  • < 10ms Turn-On Time
  • Space-Saving, 4mm x 4mm x 0.8mm, 24-Pin TQFN Package


  • 2.1 Notebook PCs
  • LCD/PDP/CRT Monitors
  • MP3 Docking Stations
  • PC Surround Speakers

Key Specifications:

Speaker Amplifiers
Part Number Class Spkr. Amp. VCC
Spkr. Amp. VCC
Spkr. Amp. ICC
POUT into 4Ω @ 1% THD+N
POUT into 4Ω @ 10% THD+N
POUT into 8Ω @ 1% THD+N
POUT into 8Ω @ 10% THD+N
Spkr. Amp. Half Pwr. THD+N
min max typ min min min min A- Weighted min See Notes
MAX9737  D 8 28 15 12 14 6 7.5 0.06 97 80 $1.09 @1k
See All Speaker Amplifiers (37)

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.


MAX9737: Typical Application Circuit
Typical Application Circuit

Technical Documents

Product Guide 5159  Audio

Product Guides

Audio (PDF)

Reliability Reports

Reliability Report: MAX9737.pdf
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Ordering Information

Filters: Part Number Package: Temperature: Tape and Reel Sample
Part Number Free
Buy Status Explanations for product status codes Package:
Temp RoHS/Lead-Free?
Materials Analysis
Active TQFN;24 pin;16.8 mm²
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
Active TQFN;24 pin;16.8 mm²
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
Active TQFN;24 pin;16.8 mm²
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
Active TQFN;24 pin;16.8 mm²
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

  1. Other options and links for purchasing parts are listed at:
  2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
  3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
  4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Similar Products by Function

See All Speaker Amplifiers (41Products)

Similar Products by Application

MP3 Docking Stations: Mid Level > Class D Speaker Amplifiers

Evaluation Kits

MAX9737EVKIT Evaluation Kit for the MAX9737

Products with Similar Part Numbers

MAX9737EVKIT Evaluation Kit for the MAX9737

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Information Index

Document Ref.: 19-4327 Rev 0; 2008-11-18
This page last modified: 2010-06-08