Product details

Output power (W) 0.25 Analog supply (min) (V) 3 Analog supply voltage (max) (V) 3.6 Load (min) (Ω) 32 PSRR (dB) 80 Rating Catalog Operating temperature range (°C) -40 to 85 Headphone channels Stereo Volume control No Shutdown current (ISD) (µA) 1 Architecture Class-AB Iq per channel (typ) (mA) 14
Output power (W) 0.25 Analog supply (min) (V) 3 Analog supply voltage (max) (V) 3.6 Load (min) (Ω) 32 PSRR (dB) 80 Rating Catalog Operating temperature range (°C) -40 to 85 Headphone channels Stereo Volume control No Shutdown current (ISD) (µA) 1 Architecture Class-AB Iq per channel (typ) (mA) 14
TSSOP (PW) 14 32 mm² 5 x 6.4
  • Stereo DirectPath™ Headphone Amplifier
    • 40 mW Into 32 Ω With 3.3-V Supply
  • Low THD+N < 0.01% at 10 mW Into 32 Ω
  • High SNR, >90 dB
  • Differential Input and Single-Ended Output
  • Adjustable Gain by External Gain-Setting
    Resistors
  • Configurable as a Second-Order Low-Pass Filter
    • Ideal for PWM Audio Sources
  • Low DC Offset, <1 mV
  • Ground-Referenced Outputs Eliminate DC-
    Blocking Capacitors
    • Reduce Board Area
    • Reduce Component Cost
    • Improve THD+N Performance
    • No Degradation of Low-Frequency Response
      Due to Output Capacitors
  • Short-Circuit Protection
  • Click- and Pop-Reduction Circuitry
  • External Undervoltage Mute
  • Active Mute Control for Pop-Free Audio On/Off
    Control
  • Space-Saving TSSOP Package
  • Stereo DirectPath™ Headphone Amplifier
    • 40 mW Into 32 Ω With 3.3-V Supply
  • Low THD+N < 0.01% at 10 mW Into 32 Ω
  • High SNR, >90 dB
  • Differential Input and Single-Ended Output
  • Adjustable Gain by External Gain-Setting
    Resistors
  • Configurable as a Second-Order Low-Pass Filter
    • Ideal for PWM Audio Sources
  • Low DC Offset, <1 mV
  • Ground-Referenced Outputs Eliminate DC-
    Blocking Capacitors
    • Reduce Board Area
    • Reduce Component Cost
    • Improve THD+N Performance
    • No Degradation of Low-Frequency Response
      Due to Output Capacitors
  • Short-Circuit Protection
  • Click- and Pop-Reduction Circuitry
  • External Undervoltage Mute
  • Active Mute Control for Pop-Free Audio On/Off
    Control
  • Space-Saving TSSOP Package

The TPA6138A2 is a pop-free stereo headphone amplifier designed to allow the removal of the output dc-blocking capacitors for reduced component count and cost. The device is ideal for single-supply electronics where size and cost are critical design parameters.

Designed using TI’s patented DirectPath™ technology, The TPA6138A2 is capable of driving 25 mW into a 32-Ω load with 3.3-V supply voltage. The device has differential inputs and uses external gain-setting resistors that supports a gain range of ±1 V/V to ±10 V/V. Gain can be configured individually for each channel. The device can also be configured as a second-order low-pass filter and is ideal for interfacing with PWM audio sources. Audio output compiles with ±8-kV IEC ESD protection, requiring just a simple resistor-capacitor ESD protection circuit. The TPA6138A2 has built-in active-mute control for pop-free audio on/off control. The TPA6138A2 has an external undervoltage detector that mutes the output when the power supply is removed, ensuring a pop-free shutdown.

Using the TPA6138A2 in audio products can reduce component count considerably compared to traditional headphone amplifiers. The TPA6138A2 does not require a split-rail power supply or a dc blocking capacitor. The TPA6138A2 integrates its own charge pump to generate a negative supply rail that provides a clean, pop-free ground-biased audio signal.

The TPA6138A2 is available in a 14-pin TSSOP.

The TPA6138A2 is a pop-free stereo headphone amplifier designed to allow the removal of the output dc-blocking capacitors for reduced component count and cost. The device is ideal for single-supply electronics where size and cost are critical design parameters.

Designed using TI’s patented DirectPath™ technology, The TPA6138A2 is capable of driving 25 mW into a 32-Ω load with 3.3-V supply voltage. The device has differential inputs and uses external gain-setting resistors that supports a gain range of ±1 V/V to ±10 V/V. Gain can be configured individually for each channel. The device can also be configured as a second-order low-pass filter and is ideal for interfacing with PWM audio sources. Audio output compiles with ±8-kV IEC ESD protection, requiring just a simple resistor-capacitor ESD protection circuit. The TPA6138A2 has built-in active-mute control for pop-free audio on/off control. The TPA6138A2 has an external undervoltage detector that mutes the output when the power supply is removed, ensuring a pop-free shutdown.

Using the TPA6138A2 in audio products can reduce component count considerably compared to traditional headphone amplifiers. The TPA6138A2 does not require a split-rail power supply or a dc blocking capacitor. The TPA6138A2 integrates its own charge pump to generate a negative supply rail that provides a clean, pop-free ground-biased audio signal.

The TPA6138A2 is available in a 14-pin TSSOP.

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Technical documentation

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Type Title Date
* Data sheet TPA6138A2 DirectPath™ Headphone Driver With Adjustable Gain datasheet (Rev. B) PDF | HTML 24 Aug 2015
Application note Guidelines for Measuring Audio Power Amplifier Performance (Rev. A) 26 Aug 2019
Application note AN-1849 An Audio Amplifier Power Supply Design (Rev. C) 27 Jun 2019
EVM User's guide TPA6138A2 EVM User's Guide (Rev. A) 11 Jan 2011

Design & development

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

Evaluation board

TPA6138A2EVM — TPA6138A2EVM Evaluation Module

The TPA6138A2EVM customer evaluation module (EVM) demonstrates the capabilities and operation of the TPA6138A2PW integrated circuit from Texas Instruments. The TPA6138A2PW is a 25mW Pop-Free stereo Head Phone driver designed to replace headphone circuit based on Op amps and passives.

The TPA6138A2 (...)

User guide: PDF
Not available on TI.com
Simulation model

TPA6138A2 PSPICE Transient Model (Rev. B)

SLOM212B.ZIP (33 KB) - PSpice Model
Simulation model

TPA6138A2 TINA-TI Transient Reference Design (Rev. A)

SLOM214A.TSC (33 KB) - TINA-TI Reference Design
Simulation model

TPA6138A2 TINA-TI Transient Spice Model (Rev. A)

SLOM213A.ZIP (15 KB) - TINA-TI Spice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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TSSOP (PW) 14 View options

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