MAX9703, MAX9704 10W Stereo/15W Mono, Filterless, Spread-Spectrum, Class D Amplifiers

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The MAX9703/MAX9704 mono/stereo Class D audio power amplifiers provide Class AB amplifier performance with Class D efficiency, conserving board space and eliminating the need for a bulky heatsink. Using a Class D architecture, these devices deliver up to 15W while offering up to 78% efficiency. Proprietary and patent-protected modulation and switching schemes render the traditional Class D output filter unnecessary.

The MAX9703/MAX9704 offer two modulation schemes: a fixed-frequency mode (FFM), and a spread-spectrum mode (SSM) that reduces EMI-radiated emissions due to the modulation frequency. The device utilizes a fully differential architecture, a full bridged output, and comprehensive click-and-pop suppression.

The MAX9703/MAX9704 feature high 80dB PSRR, low 0.07% THD+N, and SNR in excess of 95dB. Short-circuit and thermal-overload protection prevent the devices from being damaged during a fault condition. The MAX9703 is available in a 32-pin TQFN (5mm x 5mm x 0.8mm) package. The MAX9704 is available in a 32-pin TQFN (7mm x 7mm x 0.8mm) package. Both devices are specified over the extended -40°C to +85°C temperature range.

Key Features

Applications/Uses

Filterless Class D Amplifier
Unique Spread-Spectrum Mode Offers 5dB Emissions Improvement Over Conventional Methods
Up to 78% Efficient (R_L = 8Ω)
Up to 88% Efficient (R_L = 16Ω)
15W Continuous Output Power into 8Ω (MAX9703)
2x10W Continuous Output Power into 8Ω (MAX9704)
Low 0.07% THD+N
High PSRR (80dB at 1kHz)
10V to 25V Single-Supply Operation
Differential Inputs Minimize Common-Mode Noise
Pin-Selectable Gain Reduces Component Count
Industry-Leading Click-and-Pop Suppression
Low Quiescent Current (24mA)
Low-Power Shutdown Mode (0.2μA)
Short-Circuit and Thermal-Overload Protection
Available in Thermally Efficient, Space-Saving Packages
- 32-Pin TQFN (5mm x 5mm x 0.8mm)–MAX9703
- 32-Pin TQFN (7mm x 7mm x 0.8mm)–MAX9704

	Automotive
	Desktop PCs
	Hands-Free Car
	LCD Monitors
	LCD Projectors
	LCD TVs
	Phone Adaptors

Key Specifications: Speaker Amplifiers

Part Number

Class

Speaker Amp. V_CC (min) (V)

Speaker Amp. V_CC (max) (V)

Speaker Amp. I_CC (typ) (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)

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

SNR, A-weighted (dB)

PSRR (db)

Speaker Amp. External Gain

Speaker Amp. Fixed Gain (min) (V/V)

Speaker Amp. Fixed Gain (max) (V/V)

Features

Number of Channels

Package

RoHS Available

Price^*

MAX9703

0.015

4.5

•	Differential Inputs

THIN QFN/32

Yes

$1.75 @ 1k

MAX9704

0.02

$1.95 @ 1k

See All Speaker Amplifiers (29)

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.