1 Features

1• DirectPath™

– Eliminates Pops and Clicks

– Eliminates Output DC-Blocking Capacitors

– 3-V to 3.6-V Supply Voltage

• Low Noise and THD

– SNR > 105 dB at –1x Gain

– Typical Vn < 15 μVms 20 to 20 kHz at –1x

Gain

– THD+N < 0.003% at 10-kΩ Load and –1x Gain

• 25 mW into 32-Ω Load

• 2-Vrms Output Voltage into 600-Ω Load

• Single-Ended Input and Output

• Programmable Gain Select Reduces Component

Count

– 13x Gain Values

• Active Mute With More Than 80-dB Attenuation

• Short-Circuit and Thermal Protection

• ±8-kV HBM ESD Protected Outputs

2 Applications

• PDP and LCD TVs

• Blu-ray Discs™, DVD Players

• Mini and Micro Combo Systems

• Soundcards

3 Description

The TPA6139A2 is a 25-mW, pop-free stereo

headphone driver designed to reduce component

count, board space and cost. It is ideal for singlesupply

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 TI's

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 output DC-blocking

capacitors.

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 space.

Headphone outputs have ±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.