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MAX9709
25W/50W, Filterless, Spread-Spectrum, Stereo/Mono, Class D Amplifier
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Status
Active: In Production.
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.
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Data Sheet
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An evaluation kit is available: MAX9709EVKIT
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
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Applications/Uses
- Automotive
- LCD TVs
- PC/HiFi Audio Solutions
- PDP TVs
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Key Specifications:
| Speaker Amplifiers |
| Part Number |
Class |
Spkr. Amp. VCC
(V) |
Spkr. Amp. VCC
(V) |
Spkr. Amp. ICC
(mA) |
POUT into 4Ω @ 1% THD+N
(W) |
POUT into 4Ω @ 10% THD+N
(W) |
POUT into 8Ω @ 1% THD+N
(W) |
POUT into 8Ω @ 10% THD+N
(W) |
Spkr. Amp. Half Pwr. THD+N
(%) |
SNR
(dB) |
PSRR
(dB) |
Spkr. Amp. Ext. Gain |
Spkr. Amp. Fxd. Gain
(V/V) |
Spkr. Amp. Fxd. Gain
(V/V) |
Channels |
Budgetary Price |
| min |
max |
typ |
min |
min |
min |
min |
A- Weighted |
min |
min |
max |
See Notes |
| MAX9709 |
D |
10 |
22 |
20 |
39 |
50 |
19 |
25 |
0.1 |
95 |
90 |
No |
12.6 |
63 |
2 |
$3.15 @1k |
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See All Speaker Amplifiers (41)
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Pricing 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.
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Diagram
 Simplilfied Block Diagram
Application Notes
Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX9709ETN+
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Active |
TQFN;56 pin;65.6 mm²
Outline Drawing:21-0135 (PDF)
Land Pattern: 90-0047 (PDF)
Use pkgcode/variation: T5688+3*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX9709ETN+D
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Active |
TQFN;56 pin;65.6 mm²
Outline Drawing:21-0135 (PDF)
Land Pattern: 90-0047 (PDF)
Use pkgcode/variation: T5688+3*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX9709ETN+T
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Active |
QFN;
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX9709ETN+TD
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Active |
TQFN;56 pin;65.6 mm²
Outline Drawing:21-0135 (PDF)
Land Pattern: 90-0047 (PDF)
Use pkgcode/variation: T5688+3*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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| MAX9708 |
20W/40W, Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier |
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Information Index
Document Ref.: 19-3769
Rev 1;
2008-06-27
This page last modified: 2010-05-26
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