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2.9-W 3-Input Audio Subsystem with SmartGain™ Mono Class-D and DirectPath Headphone Amplifier


Package | PIN: YFF | 25
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $2.83
10-24 $2.53
25-99 $2.35
100-249 $2.05
250-499 $1.89
500-749 $1.59
750-999 $1.30
1000+ $1.19


  • Mono Class-D Amp: 730 mW into 8 from 3.6 V Supply (1% THD)
  • Class-D Bypass Switches
  • DirectPath Stereo Headphone Amplifier
    • No Output Capacitors Required
  • SpeakerGuard Automatic Gain Control (AGC)
  • One Differential Mono and Two Stereo Single-Ended Inputs
  • 3:1 Input MUX with Mode Control
  • 32-Step Volume Control for Both Input Channels
  • Independent Volume Controls for All Inputs
  • Independent Shutdown for Headphone and Class-D Amplifiers
  • I2C Interface
  • Short-Circuit and Thermal-Overload Protection
  • Operates from 2.5 V to 5.5 V
  • 25-Ball 2,16 mm × 2,11 mm, 0,4 mm pitch WCSP
    • Smart Phones / Cellular Phones
    • Portable Media Players
    • Portable Gaming
    • Multimedia Platforms

Texas Instruments  TPA2051D3YFFR

The TPA2051D3 is an audio subsystem with a mono Class-D power amplifier, a stereo DirectPath headphone amplifier, and bypass switches. The DirectPath headphone amplifier eliminates the need for external dc-blocking output capacitors. The built-in charge pump creates a negative supply voltage for the headphone amplifier, allowing a 0 V dc bias at the output. The DirectPath headphone amplifier drives 25 mW into 16 speakers from a 4.2 V supply.

The subsystem includes three inputs: A differential mono input and two stereo single-ended (SE) inputs. The stereo inputs are also configurable as differential mono inputs. Each input channel has an independent volume control. Seven operating modes provide input-to-output combinations and shutdown control. Operating mode and volume levels are controlled over a 1.8 V compatible I2C interface.

The TPA2051D3 uses SpeakerGuardTM technology to prevent output clipping distortion and excessive power to the speaker and headphones.

The Class-D amplifier includes a bypass mode. This allows the baseband IC (BB) to directly drive the 8 speaker. This is useful for dual-mode speaker phones in voice—only mode.

The Class-D amplifier uses 4.9 mA and the DirectPath amplifier uses 4.1 mA of typical quiescent current. Total supply current reduces to less than 1 µA in shutdown.

The TPA2051D3 is available in a 25-bump 2,16 mm × 2,11 mm, 0,4 mm pitch WCSP with less than 0.8 mm height.