10-W stereo, 18.5-W mono, 3.5- to 14.4-V, analog input Class-D audio amplifier w/ inductor free


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 Power to parallel bridge tied load (Max) (W) 18.5 PSRR (dB) 70 Rating Catalog Operating temperature range (C) -40 to 85 open-in-new Find other Speaker amps

Package | Pins | Size

HTSSOP (PWP) 28 43 mm² 9.7 x 4.4 open-in-new Find other Speaker amps


  • Wide Supply Range 3.5-V to 14.4-V
    • 2 × 10 W into 6-Ω, 1% THD+N, 12-V Supply
    • 1 x 18.5 W into 4-Ω, 10% THD+N, 12-V Supply
    • THD+N : 0.04% at 1 W, 1 kHz input, 6-Ω
  • Longer Battery Life for Portable Applications:
    • 20-mA (12-V) Idle Current in 1SPW Mode
    • >90% Class-D Efficiency
  • Reduced Solution Size and Cost:
    • Inductor-Free Operation
    • EN55013 and EN55022 EMC Compliant When No Inductors are Used
    • No External Heatsink Required
  • Flexible Audio Solution:
    • Single-ended or Differential Analog Inputs
    • Selectable Gain: 20 dB and 26 dB
    • Pop and Click-Free Startup
  • 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
  • Pin-to-Pin Compatible with TPA3110D2, TPA3136D2 and TPA3136AD2

All trademarks are the property of their respective owners.

open-in-new Find other Speaker amps


The TPA3138D2 is a 10-W/ch, high-efficiency, low-idle-current Class-D stereo audio amplifier. It can drive stereo speakers with a load as low as 3.2-Ω. In the 1SPW mode, it consumes a low idle current of only 21-mA (12-V) and can operate down to 3.5-V, allowing for longer audio play and improved thermal performance in bluetooth speakers, battery-powered appliances and other power-sensitive applications.

Advanced EMI Suppression with 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 TPA3138D2 integrates essential protection features including undervoltage, overvoltage, power limit, short circuit, overtemperature, as well as DC speaker protection. All of these protections come with automatic recovery.

Customers can leverage every TPA3138D2 feature in existing designs as it is fully pin-to-pin compatible to TI’s TPA3110D2, TPA3136D2 and TPA3136AD2.

open-in-new Find other Speaker amps

Technical documentation

= Featured
No results found. Please clear your search and try again. View all 4
Type Title Date
* Datasheet TPA3138D2 10-W, 3.5-V to 14.4-V, Inductor Free, Stereo Class-D Speaker Amplifier datasheet (Rev. A) Jun. 08, 2018
Application notes TPA3136D2 Design Considerations for EMC (Rev. A) Jul. 27, 2018
Application notes TPA3138 Transition Guide – from TPA3110, TPA3113 Jul. 06, 2018
User guides TPA3138D2 Evaluation Module User's Guide Dec. 05, 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide
The TPA3138D2EVM allows for the evaluation of the TPA3138D2. This is an efficient class D audio power amplifier for driving 2 bridged-tied stereo speakers at 10W per channel. The evaluation module is populated with only 1 TPA3138D2 device. It operates from a single power supply from 4.5V to 14.4V (...)
  • 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: 4.5 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

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 28 View options

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​


PurePath™ Studio Graphical Development Environment Start-up

A step-by-step guide to downloading and installing TI's PurePath™ Studio software for audio evaluation modules. This video features the TLV320AIC3254EVM-U.

Posted: 17-Jan-2016
Duration: 03:45

Learn more

Related videos