10W 3.5V–14.4V Inductor-free stereo QFN analog input Class-D audio amplifier


Product details


Audio input type Analog Input Architecture Class-D Speaker channels (Max) Stereo Power stage supply (Max) (V) 14.4 Power stage supply (Min) (V) 3.5 Load (Min) (ohms) 3.2 Output power (W) 10 SNR (dB) 102 THD + N @ 1 kHz (%) 0.04 Iq (Typ) (mA) 20 Control interface Hardware Closed/open loop Closed Analog supply (Min) (V) 3.5 Analog supply (Max) (V) 14.4 PSRR (dB) 70 Operating temperature range (C) -10 to 85 open-in-new Find other Speaker amps

Package | Pins | Size

VQFN (RGE) 24 16 mm² 4 x 4 open-in-new Find other Speaker amps


  • 2 × 3 W into 8-Ω, 1% THD+N, 7.4-V supply
  • 2 × 10 W into 8-Ω, 1% THD+N, 13.5-V supply
  • Fast Turn-on time < 15 ms
  • Wide supply range 3.5-V to 14.4-V
  • Low idle current and small footprint for portable audio applications
    • 4 x 4 mm2 QFN-24 package
    • 20-mA (12-V) idle current with 1SPW modulation
    • > 90% Class-D efficiency
  • Flexible audio solution:
    • MUTE signal for fast enable and enable of outputs
    • Single-ended or differential analog inputs
    • Selectable gain: 20 dB and 26 dB
  • Integrated Protections and Auto Recovery:
    • Pin-to-pin, pin-to-ground, and pin-to-power short circuit protection
    • Thermal protection, undervoltage protection, and overvoltage protection
    • Power limiter and DC speaker protection
  • Spread-spectrum modulation reduces EMI emission
  • Reduced solution size and cost:
    • EN55022 EMC compliant with ferrite bead filters
    • No external heatsink required

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The TPA3139D2 is a 10-W stereo Class-D audio amplifier, featuring a fast turn-on time of <15 ms and mute function. It consumes low idle current of only 20-mA (12-V) and can operate down to 3.5-V, allowing for longer audio playback. Along with a small, 4 x 4 mm2 QFN package, the TPA3139D2 is optimized for 2-cell or 3-cell battery-powered systems with the space constraints. In addition, the Spread Spectrum Control enables the use of inexpensive ferrite bead filters while meeting EMC requirements for system cost reduction.

To further simplify the design, the TPA3139D2 integrates essential protection features including undervoltage, overvoltage, power limit, short circuit, overtemperature, as well as DC speaker protection. All of these protections support automatic recovery.

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Technical documentation

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Type Title Date
* Datasheet TPA3139D2 10-W Stereo, 3.5-V to 14.4-V, Low-Idle-Current, Inductor Free Class D datasheet (Rev. A) Jul. 24, 2020
User guides TPA3139D2 Evaluation Module User's Guide Jul. 15, 2019

Design & development

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Hardware development

document-generic User guide
The TPA3139D2EVM customer evaluation module demonstrates the TPA3139D2 integrated circuit from Texas Instruments. The TPA3139D2 is a 10-W (per channel) efficient stereo digital amplifier power stage for driving two bridge-tied speakers.
  • Supports Multiple Output Configurations
    • 2 × 10 W Into a 6-O BTL Load at 1% THD and-12 V
    • 2 × 9 W Into a 8-O BTL Load at 10% THD and 12 V
  • Wide Voltage Range: 3.5 V to 14.4 V
  • Efficient Class-D Operation
    • Up to 90% Power Efficiency Combined With Low Idle Loss
    • Advanced Modulation Schemes
  • Programmable Power Limit

Design tools & simulation

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  • 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
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
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CAD/CAE symbols

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VQFN (RGE) 24 View options

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