1FEATURES
23· Patented DirectPath™ Technology Eliminates
Need for DC-Blocking Capacitors
– Outputs Biased at 0 V
– Excellent Low Frequency Fidelity
· Active Click and Pop Suppression
· HI-Z Output Mode Allows Sharing Output Jack
· 2.1 mA Typical Supply Current
· Fully Differential Inputs Reduce System Noise
– Also Configurable as Single-Ended Inputs
· SGND Pin Eliminates Ground Loop Noise
· Constant Maximum Output Power from 2.3 V
to 5.5 V Supply
– Simplifies Design to Prevent Acoustic
Shock
· MicrosoftTM Windows VistaTM Compliant
· 100 dB Power Supply Noise Rejection
· Wide Power Supply Range: 2.3 V to 5.5 V
· Gain Settings: 0 dB and 6 dB
· Short-Circuit and Thermal-Overload Protection
· ±8 kV HBM ESD Protected Outputs
· Small Package Available
– 16-Ball, 1.6 x 1.6 mm, 0.4 mm Pitch WCSP

APPLICATIONS
· Smart Phones / Cellular Phones
· Portable Media / MP3 Players
· Notebook Computers
· Portable Gaming

DESCRIPTION
The TPA6136A2 (sometimes referred to as TPA6136)
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 0 dB or 6 dB.
The amplifier drives 25 mW into 16 Ω speakers from
a single 2.3 V supply. The TPA6136A2 (TPA6136)
provides a constant maximum output power
independent of the supply voltage, thus facilitating the
design for prevention of acoustic shock.
The TPA6136A2 (TPA6136) features fully differential
inputs with an integrated low pass filter to reduce
system noise pickup between the audio source and
the headphone amplifier and to reduce DAC
out-of-band noise. 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
turn-on and turn-off. The amplifier outputs have
short-circuit and thermal-overload protection along with ±8 kV HBM ESD protection, simplifying end
equipment compliance to the IEC 61000-4-2 ESD
standard.
The TPA6136A2 (TPA6136) 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 mA.