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MAX9737 Mono 7W Class D Amplifier

Direct-from-Battery 7W Class D Amplifier Slashes Notebook 2.1 Solution Cost

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Status

Active: In Production.

Description

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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.

An evaluation kit is available: MAX9737EVKIT

Key Features Applications/Uses

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