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.