Top ![]()
MAX9709
25W/50W, Filterless, Spread-Spectrum, Stereo/Mono, Class D Amplifier
MyMaxim SubscriptionsProduct Details
Key Features
Applications/Uses
Parametric specs for Speaker Amplifiers
| # Channels | 2 |
| Class | D |
| Spkr. Amp. VCC (V) (min) | 10 |
| Spkr. Amp. VCC (V) (max) | 22 |
| Spkr. Amp. ICC (mA) (typ) | 20 |
| POUT into 4Ω @ 1% THD+N (W) (min) | 39 |
| POUT into 4Ω @ 10% THD+N (W) (min) | 50 |
| POUT into 8Ω @ 1% THD+N (W) (min) | 19 |
| POUT into 8Ω @ 10% THD+N (W) (min) | 25 |
| Spkr. Amp. Half Pwr. THD+N (%) | 0.1 |
| SNR (dB) (A- Weighted) | 95 |
| PSRR (dB) (min) | 90 |
| Package/Pins | TQFN/56 |
| Budgetary Price (See Notes) | 9.69 |
View Less
Simplified Block Diagram
Technical Docs
| Data Sheet | 25W/50W, Filterless, Spread-Spectrum, Stereo/Mono, Class D Amplifier | May 12, 2014 | |
| App Note | Fundamentals of Class D Amplifiers | Maxim Integrated |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Parameters
Parametric specs for Speaker Amplifiers
| # Channels | 2 |
| Class | D |
| Spkr. Amp. VCC (V) (min) | 10 |
| Spkr. Amp. VCC (V) (max) | 22 |
| Spkr. Amp. ICC (mA) (typ) | 20 |
| POUT into 4Ω @ 1% THD+N (W) (min) | 39 |
| POUT into 4Ω @ 10% THD+N (W) (min) | 50 |
| POUT into 8Ω @ 1% THD+N (W) (min) | 19 |
| POUT into 8Ω @ 10% THD+N (W) (min) | 25 |
| Spkr. Amp. Half Pwr. THD+N (%) | 0.1 |
| SNR (dB) (A- Weighted) | 95 |
| PSRR (dB) (min) | 90 |
| Package/Pins | TQFN/56 |
| Budgetary Price (See Notes) | 9.69 |
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
Applications/Uses
- LCD TVs
- PC/HiFi Audio Solutions
- PDP TVs
Description
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.
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.
Technical Docs
| Data Sheet | 25W/50W, Filterless, Spread-Spectrum, Stereo/Mono, Class D Amplifier | May 12, 2014 | |
| App Note | Fundamentals of Class D Amplifiers | Maxim Integrated |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Request a Quote