TPA321

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350-mW Mono Class-AB Audio Amplifier with Differential Inputs

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Product details

Parameters

Audio input type Analog Input Architecture Class-AB Speaker channels (Max) Mono Power stage supply (Max) (V) 5.5 Power stage supply (Min) (V) 2.5 Load (Min) (ohms) 8 Output power (W) 0.35 THD + N @ 1 kHz (%) 1 Iq (Typ) (mA) 0.7 Control interface Hardware Closed/open loop Closed Analog supply (Min) (V) 2.5 Analog supply (Max) (V) 5.5 PSRR (dB) 85 Rating Catalog Operating temperature range (C) -40 to 85 open-in-new Find other Speaker amps

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

Features

  • 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
    • 250 mW at VDD = 3.3 V
  • Ultralow Supply Current in Shutdown Mode...0.15 µA
  • Thermal and Short-Circuit Protection
  • Surface-Mount Packaging
    • SOIC
    • PowerPAD™ MSOP

PowerPAD is a trademark of Texas Instruments.

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Description

The TPA321 is a bridge-tied load (BTL) audio power amplifier developed especially for low-voltage applications where internal speakers are required. Operating with a 3.3-V supply, the TPA321 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. This device features a shutdown mode for power-sensitive applications with a quiescent current of 0.15 µA during shutdown. The TPA321 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 TPA321: 350-mW Mono Audio Power Amplifier with Differential Inputs datasheet (Rev. C) Jun. 23, 2004
User guides TPA321EVM - User Guide Nov. 17, 2000

Design & development

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

Design tools & simulation

CALCULATION TOOLS Download
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 (...)

CAD/CAE symbols

Package Pins Download
HVSSOP (DGN) 8 View options
SOIC (D) 8 View options

Ordering & quality

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