De Pop

GAIN

Control

Current

Limit

Charge Pump

Thermal

Limit

Left

Right

Power

Management

Current

Limit

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9

TPA6139A2

www.ti.com

SLOS700C – JANUARY 2011 – REVISED APRIL 2016

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9 Detailed Description

9.1 Overview

The TPA6139A2 is a DirectPath stereo headphone amplifier that requires no output DC-blocking capacitors and

is capable of delivering 25 mW into a 32-

Ω load. The device has built-in pop suppression circuitry to completely

eliminate pop noise during turnon and turnoff. The amplifier outputs have short-circuit protection.

The TPA6139A2 gain is controlled by external resistors Rin and Rfb, see Gain Setting for recommended values.

The TPA6139A2 operates from a single 3-V to 3.6-V supply, as it uses a built-in charge pump to generate a

negative voltage supply for the headphone amplifiers.

9.2 Functional Block Diagram

9.3 Feature Description

9.3.1 DirectPath Headphone Driver

Single-supply line-driver amplifiers typically require DC-blocking capacitors. The top drawing in Figure 9

illustrates the conventional line-driver amplifier connection to the load and output signal.

DC-blocking capacitors are often large in value, and a mute circuit is needed during power up to minimize click

and pop. The output capacitor and mute circuit consume PCB area and increase cost of assembly, and can

reduce the fidelity of the audio output signal.