3-W Mono Class-D Audio Amplifier with SmartGain™ AGC/DRC


Product details


Audio input type Analog Input Architecture Class-D Speaker channels (Max) Mono Power stage supply (Max) (V) 5.5 Power stage supply (Min) (V) 2.5 Load (Min) (ohms) 4 Output power (W) 3 THD + N @ 1 kHz (%) 0.1 Iq (Typ) (mA) 2 Control interface I2C Closed/open loop Closed Analog supply (Min) (V) 2.5 Analog supply (Max) (V) 5.5 PSRR (dB) 80 Operating temperature range (C) -40 to 85 open-in-new Find other Speaker amps

Package | Pins | Size

DSBGA (YZF) 9 3 mm² 1.664 x 1.664 open-in-new Find other Speaker amps


  • Filter-Free Class-D Architecture
  • 3 W Into 4 at 5 V (10% THD+N)
  • 880 mW Into 8 at 3.6 V (10% THD+N)
  • Power Supply Range: 2.5 V to 5.5 V
  • Flexible Operation With/Without I2C
  • Programmable DRC/AGC Parameters
  • Digital I2C Volume Control
  • Selectable Gain from -28 dB to 30 dB in 1-dB Steps (when compression is used)
  • Selectable Attack, Release and Hold Times
  • 4 Selectable Compression Ratios
  • Low Supply Current: 1.8 mA
  • Low Shutdown Current: 0.2 µA
  • High PSRR: 80 dB
  • Fast Start-up Time: 5 ms
  • AGC Enable/Disable Function
  • Limiter Enable/Disable Function
  • Short-Circuit and Thermal Protection
  • Space-Saving Package
    • 1,63 mm × 1,63 mm Nano-Free WCSP (YZF)
    • Wireless or Cellular Handsets and PDAs
    • Portable Navigation Devices
    • Portable DVD Player
    • Notebook PCs
    • Portable Radio
    • Portable Games
    • Educational Toys
    • USB Speakers

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The TPA2018D1 is a mono, filter-free Class-D audio power amplifier with volume control, dynamic range compression (DRC) and automatic gain control (AGC). It is available in a 1.63 mm x 1.63 mm WCSP package.

The DRC/AGC function in the TPA2018D1 is programmable via a digital I2C interface. The DRC/AGC function can be configured to automatically prevent distortion of the audio signal and enhance quiet passages that are normally not heard. The DRC/AGC can also be configured to protect the speaker from damage at high power levels and compress the dynamic range of music to fit within the dynamic range of the speaker. The gain can be selected from -28 dB to +30 dB in 1-dB steps. The TPA2018D1 is capable of driving 3 W at 5 V into 4 load or 880 mW at 3.6 V into 8 load. The device features hardware and software shutdown controls and also provides thermal and short-circuit protection.

In addition to these features, a fast start-up time and small package size make the TPA2018D1 an ideal choice for cellular handsets, PDAs and other portable applications.

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Same functionality and pinout but is not an equivalent to the compared device:
TPA2028D1 ACTIVE 3.0 W Mono Class-D Audio Amplifier with fast gain ramp SmartGain™ AGC and DRC This product a functionally identical Class-D audio amp with the same pinout, but has faster gain ramp on the SmartGain AGC/DRC
Similar but not functionally equivalent to the compared device:
TPA2010D1 ACTIVE 2.5-W Mono Class-D Audio Amplifier with Variable Gain (TPA2010) This product is a lower-power (2.5-W) mono Class-D amplifier with variable gain
TPA2011D1 ACTIVE 3.2W mono class-d with auto-recovering short-circuit protection This product is a similar mono Class-D amplifier with lower supply current and lower shutdown current

Technical documentation

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Type Title Date
* Datasheet 3-W Mono Class-D Audio Amplifier with SmartGain AGC/DRC datasheet Aug. 01, 2009

Design & development

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Hardware development

document-generic User guide

The TPA2018D1 is a mono, filter-free Class-D audio power amplifier with automatic gain control (AGC), dynamic range compression(DRC) and I2C digital volume control. The AGC and DRC functions enhance the perceived audio loudness, and at the same time prevent speaker damage from overdrive. The (...)

  • Filter-Free Class-D Architecture
  • 1.7 W Into 8 ohm at 5 V (10% THD+N)
  • 750 mW Into 8 ohm at 3.6 V (10% THD+N)
  • Power Supply Range: 2.5 V to 5.5 V
  • Flexible Operation With/Without I2C™
  • Programmable DRC/AGC Parameters
  • Digital I2C™ Volume Control
  • Selectable Gain from -28 dB to 30 dB in 1-dB
  • Steps (when compression (...)

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  • 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
  • (...)
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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