TPA2051D3 Datasheet, PDF (1/33 Pages) Texas Instruments – 2.9 W/Channel Mono Class-D Audio Subsystem with DirectPath™ Headphone Amplifier & SpeakerGuard™

TPA2051D3
www.ti.com ...................................................................................................................................................................................................... SLOS641 – JUNE 2009
2.9 W/Channel Mono Class-D Audio Subsystem with DirectPath™ Headphone Amplifier &
SpeakerGuard™
FEATURES
1
•23 Mono Class-D Amp: 730 mW into 8 Ω from 3.6
V Supply (1% THD)
• Class-D Bypass Switches
• DirectPath™ Stereo Headphone Amplifier
– No Output Capacitors Required
• SpeakerGuard™ Automatic Gain Control
(AGC)
• One Differential Mono and Two Stereo
Single-Ended Inputs
• 3:1 Input MUX with Mode Control
• 32-Step Volume Control for Both Input
Channels
• Independent Volume Controls for All Inputs
• Independent Shutdown for Headphone and
Class-D Amplifiers
• I²C™ Interface
• Short-Circuit and Thermal-Overload Protection
• Operates from 2.5 V to 5.5 V
• 25-Ball 2,16 mm × 2,11 mm, 0,4 mm pitch
WCSP
APPLICATIONS
• Smart Phones / Cellular Phones
• Portable Media Players
• Portable Gaming
• Multimedia Platforms
DESCRIPTION
The TPA2051D3 is an audio subsystem with a mono
Class-D power amplifier, a stereo DirectPath
headphone amplifier, and bypass switches. The
DirectPath headphone amplifier eliminates the need
for external dc-blocking output capacitors. 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 drives
25 mW into 16 Ω speakers from a 4.2 V supply.
The subsystem includes three inputs: A differential
mono input and two stereo single-ended (SE) inputs.
The stereo inputs are also configurable as differential
mono inputs. Each input channel has an independent
volume control. Seven operating modes provide
input-to-output combinations and shutdown control.
Operating mode and volume levels are controlled
over a 1.8 V compatible I²C interface.
The TPA2051D3 uses SpeakerGuard^TM technology to
prevent output clipping distortion and excessive
power to the speaker and headphones.
The Class-D amplifier includes a bypass mode. This
allows the baseband IC (BB) to directly drive the 8Ω
speaker. This is useful for dual-mode speaker phones
in voice–only mode.
The Class-D amplifier uses 4.9 mA and the
DirectPath amplifier uses 4.1 mA of typical quiescent
current. Total supply current reduces to less than
1 µA in shutdown.
The TPA2051D3 is available in a 25-bump 2,16 mm
× 2,11 mm, 0,4 mm pitch WCSP with less than
0.8 mm height.
ABB
Codec
(MP 3)
FM Tuner
Bypass+
Bypass-
Mono+
Mono-
Left
(SE)
TPA2051D3
Mono Class-D
plus
DirectPath^TM
Right
(SE)
Left
(SE)
Right
(SE)
8 Dual-Mode
Speaker
Stereo
Headphone Jack
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, SpeakerGuard are trademarks of Texas Instruments.
2
I2C is a trademark of Phillips Electronics.
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 © 2009, Texas Instruments Incorporated