TPA2054D4A Datasheet, PDF (1/30 Pages) Texas Instruments – 1.4 W/CH STEREO CLASS-D AUDIO SUBSYSTEM WITH DirectPath™ HEADPHONE AMPLIFIER AND 3:1 INPUT MUX

TPA2054D4A
www.ti.com
SLOS666 – MAY 2010
1.4 W/CH STEREO CLASS-D AUDIO SUBSYSTEM WITH DirectPath™ HEADPHONE
AMPLIFIER AND 3:1 INPUT MUX
Check for Samples: TPA2054D4A
FEATURES
1
•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
• 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
SIMPLIFIED SYSTEM BLOCK DIAGRAM
ABB
Mono+
Mono-
8 Speaker
Codec
MP3
FM Tuner
Left
SE
Right
SE
TPA2054D4A
Stereo Class D
plus
DirectPath™
Left
SE
Right
SE
8 Speaker
Stereo
Headphone Jack
DESCRIPTION
The TPA2054D4A features a stereo Class-D power
amplifier along with a stereo DirectPath™ headphone
amplifier. The TPA2054D4A 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 TPA2054D4A has a 3:1 input MUX for audio
source selection. Mode and gain controls operate
from a 1.7 V to 3.6 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 in shutdown reduces to less than
4 mA. Undervoltage lockout keeps supply current to
less than 4 µA when the supply voltage is less than
2.1 V.
The TPA2054D4AYZK is available in a 25-ball
2,61 mm × 2,61 mm WCSP package.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DirectPath is a trademark of Texas Instruments.
2
I²C is a trademark of NXP Semiconductors.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010, Texas Instruments Incorporated