The TPA6139A2 is a 25-mW, pop-free stereo headphone driver designed to reduce component
count, board space and cost. It is ideal for single-supply electronics where size and cost are
critical design parameters.
The TPA6139A2 device does not require a power supply greater than 3.3 V to generate its
25 mW, nor does it require a split rail power supply.
The TPA6139A2 device was designed using TIs patented DirectPath™
technology, which integrates a charge pump to generate a negative
supply rail that provides a clean, pop-free ground biased output. The
TPA6139A2 is capable of
driving 25 mW into a 32-Ω load and 2 Vrms
into a 600-Ω load. DirectPath also allows the removal of the costly
The device has fixed gain single-ended inputs with a gain select pin. Using a single
resistor on this pin, the designer can choose from 13 internal programmable gain settings to match
the line driver with the CODEC output level. It also reduces the component count and board
Headphone outputs have &plusm;8-kV HBM ESD protection enabling a simple ESD protection circuit.
The TPA6139A2 has built-in active mute control with more that 80-dB attenuation for pop-free mute
ON and OFF control.
The TPA6139A2 device is available in a 14-pin TSSOP and a 16-pin QFN. For a
pin-compatible, 2-Vrms line driver see DRV612.