100-W stereo, 200-W mono, 7- to 32-V supply, analog input Class-D audio amplifier w/ low idle


Product details


Audio input type Analog Input Architecture Class-D Speaker channels (Max) Stereo Power stage supply (Max) (V) 30 Power stage supply (Min) (V) 7 Load (Min) (ohms) 1 Output power (W) 100 SNR (dB) 108 THD + N @ 1 kHz (%) 0.02 Iq (Typ) (mA) 15 Control interface Hardware Closed/open loop Closed Analog supply (Min) (V) 5 Analog supply (Max) (V) 30 PSRR (dB) 60 Operating temperature range (C) -40 to 85 open-in-new Find other Speaker amps

Package | Pins | Size

HTSSOP (DDV) 44 113 mm² 14 x 8.1 open-in-new Find other Speaker amps


  • Wide 7-V to 30-V Supply Voltage Operation
  • Stereo (2 x BTL) and Mono (1 x PBTL) Operation
  • Output Power at 10% THD+N
    • 105-W Stereo into 4 Ω in BTL Configuration
    • 112-W Stereo into 3 Ω in BTL Configuration
    • 208-W Mono into 2 Ω in PBTL Configuration
  • Output Power at 1% THD+N
    • 88-W Stereo into 4 Ω in BTL Configuration
    • 100-W Stereo into 3 Ω in BTL Configuration
    • 170-W Mono into 2 Ω in PBTL Configuration
  • 5-V Gate Drive or Built-in LDO for Optional Single-Supply Operation
  • Closed-Loop Feedback Design
    • Signal Bandwidth up to 100 kHz for High-Frequency Content From HD Sources
    • 0.02% THD+N at 1 W into 4 Ω
    • 60-dB PSRR (BTL, No Input Signal)
    • <75-µV Output Noise (A-Weighted)
    • >108-dB SNR (A-Weighted)
    • AD or HEAD Modulation Schemes
  • Low-Power Operating Modes
    • Standby Modes: Mute and < 1 mA Shutdown
    • Low Idle-Current HEAD Modulation Scheme
    • Single-Channel BTL Operation
  • Multiple Input Options to Simplify Pre-Amp Design
    • Differential or Single-Ended Analog Inputs
    • Selectable Gains: 18 dB, 24 dB, 30 dB, 34 dB
  • Integrated Protection: Undervoltage, Overvoltage, Cycle-by-cycle Current Limit, Short Circuit, Clipping Detection, Overtemperature Warning and Shutdown, and DC Speaker Protection
  • 90% Efficient Class-D Operation (4 Ω)
  • Pin-Compatible Family of Devices with Voltage and Power-Level Options
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TPA3221 is a high-power Class-D amplifier that enables efficient operation at full-power, idle and standby. The device features closed-loop feedback with a bandwidth up to 100 kHz, which provides low distortion across the audio band and delivers excellent sound quality. The device operates with either AD or low idle-current HEAD (High Efficient AD mode) modulation, and can drive up to 2 x 105 W into 4-Ω load or 1 x 208 W into 2-Ω load.

The TPA3221 features a single-ended or differential analog-input interface that supports up to 2 VRMS with four selectable gains: 18 dB, 24 dB, 30 dB and 34 dB. The TPA3221 also achieves >90% efficiency, low idle power (<0.25 W) and ultra-low standby power (<0.1 W). This is made possible through the use of 70-mΩ MOSFETs, an optimized gate drive scheme and low-power operating modes. TPA3221 includes a built-in LDO for easy integration in single-power-supply systems. To further simplify the design, the device integrates essential protection features including undervoltage, overvoltage, cycle-by-cycle current limit, short circuit, clipping detection, overtemperature warning and shutdown, as well as DC speaker protection.

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Technical documentation

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Type Title Date
* Data sheet TPA3221 100-W Stereo, 200-W Mono HD-Audio, Analog-Input, Class-D Amplifier datasheet (Rev. B) Dec. 15, 2017
More literature High-Power Audio Amplifiers TPA322x/4x/5x Dec. 01, 2017
User guide TPA3221 Evaluation Module User's Guide (Rev. B) Nov. 03, 2017
Application note High Efficiency AD (HEAD) Modulation Oct. 18, 2017
Application note Multi-Device Configuration for TPA32xx Amplifiers Sep. 27, 2017
Application note Class-D Amplifier External Load Diagnostics Jan. 23, 2017
Application note LC Filter Design (Rev. A) Nov. 09, 2016
Application note TPA32xx Analog Input Grounding for Single Ended Inputs Aug. 26, 2016

Design & development

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Hardware development

Guitar SideGig Plug-In Module
document-generic User guide

The TI Guitar SideGig plug-in module turns TI Audio Class-D amplifier EVM’s into a guitar, bass or musical instrument amplifier. The board features selectable “clean” and “drive” channels for traditional and overdriven guitar sounds. The clean channel offers volume (...)

  • Connects to TI Class-D Amplifier EVMs with the Audio Interface Board (AIB) connector
  • Drive channel adds drive, tone and level controls
  • Clean Channel with treble, middle, bass and volume controls
  • Supports one BTL channel or PBTL Class-D amplifier output
  • Input: ¼” mono input jack for musical instruments
  • (...)
document-generic User guide
The TPA3221EVM HD-Audio evaluation module demonstrates the TPA3221 integrated circuit from Texas Instruments. TPA3221 is an ultra-low idle-loss Class-D amp which keeps your system cooler and your battery playing longer while supporting 100kHz high resolution audio and features single-rail power (...)
  • Stereo HD Audio evaluation module
  • Integrated protection system (short circuit, clip and thermal)
  • Device integrated support for Single-Ended (SE) and Differential analog input signals
  • BTL and PBTL output configurations supported
  • Double-sided, plated-through, 2oz. Cu 2 layer PCB layout
  • Convenient XLR input (...)

Software development

SLAC766.ZIP (442 KB)

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PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
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  • Supports simultaneous analysis of multiple products
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