350-mW, mono, Class-AB audio amplifier with bridge tied load to single-ended switching mode


Product details


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Package | Pins | Size

HVSSOP (DGN) 8 15 mm² 3 x 4.9 SOIC (D) 8 19 mm² 3.91 x 4.9 open-in-new Find other Speaker amps


  • Fully Specified for 3.3-V and 5-V Operation
  • Wide Power Supply Compatibility 2.5 V - 5.5 V
  • Output Power for RL = 8
    • 350 mW at VDD = 5 V, BTL
    • 250 mW at VDD = 5 V, SE
    • 250 mW at VDD = 3.3 V, BTL
    • 75 mW at VDD = 3.3 V, SE
  • Shutdown Control
    • IDD = 7 µA at 3.3 V
    • IDD = 60 µA at 5 V
  • BTL to SE Mode Control
  • Integrated Depop Circuitry
  • Thermal and Short-Circuit Protection
  • Surface Mount Packaging
    • SOIC
    • PowerPADTM MSOP

PowerPAD is a trademark of Texas Instruments Incorporated.

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The TPA311 is a bridge-tied load (BTL) or single-ended (SE) audio power amplifier developed especially for low-voltage applications where internal speakers and external earphone operation are required. Operating with a 3.3-V supply, the TPA311 can deliver 250-mW of continuous power into a BTL 8- load at less than 1% THD+N throughout voice band frequencies. Although this device is characterized out to 20 kHz, its operation was optimized for narrower band applications such as cellular communications. The BTL configuration eliminates the need for external coupling capacitors on the output in most applications, which is particularly important for small battery-powered equipment. A unique feature of the TPA311 is that it allows the amplifier to switch from BTL to SE on the fly when an earphone drive is required. This eliminates complicated mechanical switching or auxiliary devices just to drive the external load. This device features a shutdown mode for power-sensitive applications with special depop circuitry to virtually eliminate speaker noise when exiting shutdown mode and during power cycling. The TPA311 is available in an 8-pin SOIC surface-mount package and the surface-mount PowerPAD MSOP, which reduces board space by 50% and height by 40%.

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Technical documentation

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Type Title Date
* Datasheet 350-mW Low-Voltage Audio Power Amplifier datasheet (Rev. C) May 02, 2003
Application notes PowerPAD™ Thermally Enhanced Package (Rev. H) Jul. 06, 2018
User guides TPA311EVM - User Guide (Rev. A) Apr. 17, 2001
User guides TPA311MSOPEVM - User Guide (Rev. A) Apr. 17, 2001

Design & development

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Design tools & simulation

PSpice® for TI design and simulation tool
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
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  • Supports simultaneous analysis of multiple products
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Coefficient Calculator For Digital Biquad Filters
COEFFICIENT-CALC COEFFICIENT-CALC (TIBQ) calculates the coefficients for the digital filter biquad transfer function implemented in TI audio codecs. The characteristics of the digital filter are adjusted by selecting a filter type and moving a control point within a window that shows the transfer function gain and (...)

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HVSSOP (DGN) 8 View options
SOIC (D) 8 View options

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