MAX9709：25W/50W, Filterless, Spread-Spectrum, Stereo/Mono, Class D Amplifier

The MAX9709 stereo/mono, Class D audio power amplifier delivers up to 2 x 25W into an 8Ω stereo mode and 1 x 50W into a 4Ω load in mono mode while offering up to 87% efficiency. The MAX9709 provides Class AB amplifier performance with the benefits of Class D efficiency, eliminating the need for a bulky heatsink and conserving power. The MAX9709 operates from a single +10V to +22V supply, driving the load in a BTL configuration. The MAX9709 offers two modulation schemes: a fixed-frequency modulation (FFM) mode, and a spread-spectrum modulation (SSM) mode that reduces EMI-radiated emissions. The MAX9709 can be synchronized to an external clock from 600kHz to 1.2MHz. A synchronized output allows multiple units to be cascaded in the system. Features include fully differential inputs, comprehensive click-and-pop suppression, and four selectable-gain settings (22dB, 25dB, 29.5dB, and 36dB). A pin-programmable thermal flag provides seven different thermal warning thresholds. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition. The MAX9709 is available in a 56-pin TQFN (8mm x 8mm x 0.8mm) package, and is specified over the extended -40°C to +85°C temperature range.

Key Features

2 x 25W Output Power in Stereo Mode (8Ω, THD = 10%)
1 x 50W Output Power in Mono Mode (4Ω, THD = 10%)
High Efficiency: Up to 87%
Filterless Class D Amplifier
Unique Spread-Spectrum Mode
Programmable Gain (+22dB, +25dB, +29.5dB, +36dB)
High PSRR (90dB at 1kHz)
Differential Inputs Suppress Common-Mode Noise
Shutdown and Mute Control
Integrated Click-and-Pop Suppression
Low 0.1% THD+N
Current Limit and Thermal Protection
Programmable Thermal Flag
Clock Synchronization Input and Output
Available in Thermally Efficient, Space-Saving Package: 56-Pin TQFN

MAX9709: Simplilfied Block Diagram

Applications/Uses

LCD TVs
PC/HiFi Audio Solutions
PDP TVs

DataSheet

title	Download file
MAX9709 Data Sheet	MAX9709.pdf

Parametrics

Part Number	Class	Spkr. Amp. V_CC (V)	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
Part Number	Class	min	max	typ	min	min	min	min	Spkr. Amp. Half Pwr. THD+N (%)	A- Weighted	min	Package/Pins	See Notes
MAX9709	D	10	22	20	39	50	19	25	0.1	95	90	TQFN/56	$3.93 @1k

Design kits & evaluation modules

MAX9709EVKIT

Quality and Environmental Data

MAX9709.pdf

Ordering Information

Part Number	Status	Package	Temp	RoHS
MAX9709ETN+	Active	TQFN,;56 pin;65.6 mm²	-40°C to +85°C	Lead Free
MAX9709ETN+D	Active	TQFN,;56 pin;65.6 mm²	-40°C to +85°C	Lead Free
MAX9709ETN+T	No Longer Available	TQFN,;56 pin;65.6 mm²	-40°C to +85°C	Lead Free
MAX9709ETN+TD	Active	TQFN,;56 pin;65.6 mm²	-40°C to +85°C	Lead Free

MAX9709.pdf MAX9709