3-W Stereo Class-D Audio Amplifier with Volume Control (TPA2008) - TPA2008D2


3-W Stereo Class-D Audio Amplifier with Volume Control (TPA2008)



The TPA2008D2 is a third generation 5-V class-D amplifier from Texas Instruments. Improvements to previous generation devices include: dc volume control, lower supply current, lower noise floor, higher efficiency, smaller packaging, and fewer external components. Most notably, a new filter-free class-D modulation technique allows the TPA2008D2 to directly drive the speakers, without needing a low-pass output filter consisting of two inductors and three capacitors per channel. Eliminating this output filter saves approximately 30% in system cost and 75% in PCB area.

The improvements and functionality make this device ideal for LCD projectors, LCD monitors, powered speakers, and other applications that demand more battery life, reduced board space, and functionality that surpasses currently available class-D devices.

A chip-level shutdown control limits total supply current to 1 µA, making the device ideal for battery-powered applications. Protection circuitry increases device reliability: thermal and short circuit. Undervoltage shutdown saves battery power for more essential devices when battery voltage drops to low levels.

The TPA2008D2 is available in a 24-pin TSSOP PowerPAD™ package.


  • 3 W Per Channel into 3- Speakers (THD+N = 10%)
    • < 0.045% THD at 1.5 W, 1 kHz, 3- Load
  • DC Volume Control With 2-dB Steps From –38 dB to 20 dB
  • Filter Free Modulation Scheme Operates Without a Large and Expensive LC Output Filter
  • Extremely Efficient Third Generation 5-V Class-D Technology
    • Low Supply Current, 7 mA
    • Low Shutdown Control, 1 µA
    • Low Noise Floor, –80 dBV
    • Maximum Efficiency into 3 , 78%
    • Maximum Efficiency into 8 , 88%
    • PSRR, –70 dB
  • Integrated Depop Circuitry
  • Operating Temperature Range, –40°C to 85°C
  • Space-Saving, Surface Mount PowerPAD™ Package
    • LCD Projectors
    • LCD Monitors
    • Powered Speakers
    • Battery Operated and Space Constrained Systems

PowerPAD is a trademark of Texas Instruments.

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Parametrics Compare all products in Speaker Amplifier Class AB/Class D

Analog Supply (V) (Min)
Analog Supply (V) (Max)
Speaker Channels (Max)
Audio Input Type
Output Power (W)
Load (Min) (ohms)
Iq (Typ) (mA)
Iq (Max) (mA)
THD + N @ 1 kHz (%)
Iq per channel (Typ) (mA)
Package Size: mm2:W x L (PKG)
Operating Temperature Range (C)
Control Interface
Shutdown Current (ISD) (uA)
TPA2008D2 TPA6011A4 TPA6021A4
Class D       
Analog Input       
3    2    2   
3    3    4   
70    70    70   
24HTSSOP    24HTSSOP    20PDIP   
24HTSSOP: 50 mm2: 6.4 x 7.8(HTSSOP)    24HTSSOP: 50 mm2: 6.4 x 7.8(HTSSOP)    See datasheet (PDIP)   
-40 to 85    -40 to 85    -40 to 85   

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