1 Features

1• Patented DirectPath™ Technology Eliminates

Need for DC-Blocking Capacitors

– Outputs Biased at 0 V

– Excellent Low Frequency Fidelity

• Active Click and Pop Suppression

• 2.1 mA Typical Supply Current

• Fully Differential or Single-Ended Inputs

– Built-In Resistors Reduces Component Count

– Improves System Noise Performance

• Constant Maximum Output Power from 2.3 V to

5.5 V Supply

– Simplifies Design to Prevent Acoustic Shock

• Improved RF Noise Immunity

• MicrosoftTM Windows VistaTM Compliant

• High Power Supply Noise Rejection

– 100 dB PSRR at 217 Hz

– 90 dB PSRR at 10 kHz

• Wide Power Supply Range: 2.3 V to 5.5 V

• Gain Settings: –6 dB, 0 dB, 3 dB, and 6 dB

• Short-Circuit and Thermal-Overload Protection

• ±8 kV HBM ESD Protected Outputs

• Small Package Available

– 16-Pin, 3 mm × 3 mm Thin QFN

2 Applications

• Smart Phones / Cellular Phones

• Notebook Computers

• CD / MP3 Players

• Portable Gaming

3 Description

The TPA6132A2 (sometimes referred to as TPA6132)

is a DirectPath™ stereo headphone amplifier that

eliminates the need for external dc-blocking output

capacitors. Differential stereo inputs and built-in

resistors set the device gain, further reducing external

component count. Gain is selectable at –6 dB, 0 dB,

3 dB or 6 dB. The amplifier drives 25 mW into 16 Ω

speakers from a single 2.3 V supply. The TPA6132A2

(TPA6132) provides a constant maximum output

power independent of the supply voltage, thus

facilitating the design for prevention of acoustic

shock.

The TPA6132A2 features fully differential inputs to

reduce system noise pickup between the audio

source and the headphone amplifier. The high power

supply noise rejection performance and differential

architecture provides increased RF noise immunity.

For single-ended input signals, connect INL+ and

INR+ to ground.

The device has built-in pop suppression circuitry to

completely eliminate disturbing pop noise during turnon

and turn-off. The amplifier outputs have shortcircuit

and thermal-overload protection along with

±8 kV HBM ESD protection, simplifying end

equipment compliance to the IEC 61000-4-2 ESD

standard.

The TPA6132A2 operates from a single 2.3 V to

5.5 V supply with 2.1 mA of typical supply current.

Shutdown mode reduces supply current to less than

1 μA.