MAX9759 3.2W, High-Efficiency, Low-EMI, Filterless, Class D Audio Amplifier

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The MAX9759 mono Class D, audio power amplifier provides Class AB amplifier audio performance with the benefits of Class D efficiency, eliminating the need for a heatsink and extending battery life. The MAX9759 delivers up to 3.2W of continuous power into a 4Ω load while offering greater than 90% efficiency. Maxim's next-generation, low-EMI modulation scheme allows the amplifier to operate without an external LC filter while still meeting FCC EMI-radiated emission levels.

The MAX9759 offers two modulation schemes: a fixed-frequency modulation (FFM) mode and a spread-spectrum modulation (SSM) mode. The SSM mode flattens the wideband spectral components, reducing EMI-radiated emissions due to the modulation frequency. Furthermore, the MAX9759 oscillator can be synchronized to an external clock through the SYNC input, allowing the switching frequency to range from 1000kHz to 1600kHz. The SYNC input and SYNC_OUT output of the MAX9759 allow multiple Maxim Class D amplifiers to be cascaded and frequency locked, minimizing interference due to clock intermodulation. The MAX9759 utilizes fully differential input amplifiers, a full-bridged output, comprehensive click-and-pop suppression, and features four selectable gain settings (6dB, 12dB, 18dB, 24dB).

The MAX9759 features high 81dB PSRR, low 0.02% THD+N, and SNR in excess of 90dB. Short-circuit and thermal-overload protection prevents damage to the device during a fault condition. The MAX9759 operates from a single 5V supply, consumes 8.4mA of supply current, and is available in a 16-pin thin QFN package (4mm x 4mm x 0.8mm). The MAX9759 is fully specified over the extended -40°C to +85°C temperature range.

Key Features

Applications/Uses

3.2W into 4Ω Load (THD+N = 10%)
Filterless Amplifier Passes FCC Radiated Emissions Standards with 7.6cm of Cable
92% Efficiency
High PSRR (81dB at 1kHz)
Low 0.02% THD+N
External Clock Synchronization for Multiple, Cascaded Maxim Class D Amplifiers
3.0V to 5.5V Single-Supply Operation
Pin-Selectable Gain (6dB, 12dB, 18dB, 24dB)
Integrated Click-and-Pop Suppression
Low Quiescent Current (8.4mA)
Low-Power Shutdown Mode (10µA)
Mute Function
Short-Circuit and Thermal-Overload Protection
Available in Thermally Efficient Package 16-Pin TQFN (4mm x 4mm x 0.8mm)

	Cell Phones/PDAs
	Flat-Panel PC Monitors
	LCD Projectors
	LCD TVs
	Notebook PCs
	Portable DVD Players

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

RoHS Available

Package

Smallest Available Package (max w/pins) (mm²)

Price^**

MAX9759

5.5

8.4

2.6

3.2

1.4

1.8

0.03

•	External Clock Synchronization

Yes

THIN QFN/16

$0.90 @ 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.