1FEATURES

23· Stereo Class-D Amp:

– 1.4 W into 8 Ω from 5.0 V (10% THD + N)

– 1.25 W into 8 Ω from 5.0 V (1% THD + N)

· DirectPath™ Stereo Headphone Amplifier

– No Output Capacitors Required

· Independent Gain Select for Headphone

Amplifier

· Eight Programmable Maximum Headphone

Voltage Limits

· Two Single-Ended or One Differential Stereo

Input

· 3:1 Input MUX with Mode Control

· 32-Step Volume Control for Both Input

Channels

· Independent Shutdown for Headphone and

Class-D Amplifiers DC·

Short-Circuit and Thermal-Overload Protection

· ±8 kV HBM ESD Protection on Headphone

Outputs

· I2C™ Interface

· 25-Ball 2,61 mm × 2,61 mm WCSP

APPLICATIONS

· Smart Phones / Cellular Phones

· Laptop Computers

· Portable Gaming

· Portable Media Players

DESCRIPTION

The TPA2054D4 features a stereo Class-D power

amplifier along with a stereo DirectPath™ headphone

amplifier. The TPA2054D4 has a mono differential

input and two stereo single-ended (SE) inputs that

can be configured as one stereo differential input.

Both input channels have a 32-step volume control

and the DirectPath headphone amplifier has a 4-level

gain control for coarse volume adjustment. All

amplifiers have output short-circuit and thermal-

overload protection.

The Class-D amplifiers deliver 1.25 W into 8 Ω at 1%

THD from a 5.0 V supply, and 700 mW from 3.6 V.

The DirectPath headphone amplifier features an

output voltage limiter to reduce the maximum output

power to one of seven possible limits. The voltage

limiter is programmed through the I2C interface.

DirectPath eliminates the need for external DC·

blocking output capacitors to the headphones. The built-in charge pump creates a negative supply

voltage for the headphone amplifier, allowing a 0-V

DC bias at the output.

The DirectPath headphone amplifier gains are +6 dB

default), 0 dB, –6 dB, and –14 dB, selected through

the I2C interface. This allows the headphone volume

to be different from the loudspeaker volume if both

are used simultaneously.

The TPA2054D4 has a 3:1 input MUX for audio

source selection. The MUX has mode control which

directs the input-to-output signal path. Mode and gain controls operate from a 1.8 V compatible I2C

interface.

The voltage supply range for both the Class-D

amplifiers and the headphone charge pump is 2.5 V

to 5.5 V. The Class-D amplifiers use a combined 7

mA and the headphone amplifier uses 10 mA of

typical quiescent current. Total supply current

reduces to less than 2mA.

The TPA2054D4YZK is available in a 25-ball 2,61

mm × 2,61 mm WCSP package.