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.

MAX9737: Typical Application Circuit

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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

Applications/Uses

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

Key Specs

Part Number

Class

Spkr. Amp. V_CC
(V)

Spkr. Amp. I_CC
(mA)

P_OUT into 4Ω @ 1% THD+N
(W)

P_OUT into 4Ω @ 10% THD+N
(W)

P_OUT into 8Ω @ 1% THD+N
(W)

P_OUT into 8Ω @ 10% THD+N
(W)

Spkr. Amp. Half Pwr. THD+N
(%)

SNR
(dB)

PSRR
(dB)

Package/Pins

Budgetary
Price

min

max

typ

min

A- Weighted

min

See Notes

MAX9737

7.5

0.06

TQFN/24

$1.09 @1k

See All Speaker Amplifiers (34)

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.