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TPA0312 Datasheet(PDF) 1 Page - Texas Instruments

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Part No. TPA0312
Description  2.6-W STEREO AUDIO POWER AMPLIFIER WITH FOUR SELECTABLE GAIN SETTINGS AND MUX CONTROL
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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FEATURES
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PWP PACKAGE
(TOP VIEW)
GND
GAIN0
GAIN1
LOUT+
LLINEIN
LHPIN
PVDD
RIN
LOUT–
LIN
BYPASS
GND
GND
RLINEIN
SHUTDOWN
ROUT+
RHPIN
VDD
PVDD
HP/LINE
ROUT–
SE/BTL
PC-BEEP
GND
DESCRIPTION
TPA0312
SLOS335A – DECEMBER 2000 – REVISED OCTOBER 2004
2.6-W STEREO AUDIO POWER AMPLIFIER WITH FOUR
SELECTABLE GAIN SETTINGS AND MUX CONTROL
Compatible With PC 99 Desktop Line-Out Into
10-k
Ω Load
Internal Gain Control, Which Eliminates
External Gain-Setting Resistors
2.6-W/Ch Output Power Into 3-
Ω Load
Input MUX Select Terminal
PC-Beep Input
Depop Circuitry
Stereo Input MUX
Fully Differential Input
Low Supply Current and Shutdown Current
Surface-Mount Power Packaging 24-Pin
TSSOP PowerPAD™
The TPA0312 is a stereo audio power amplifier in a 24-pin TSSOP thermally enhanced package capable of
delivering 2.6 W of continuous RMS power per channel into 3-
Ω loads. This device minimizes the number of
external components needed, simplifying the design, and freeing up board space for other features. When driving
1 W into 8-
Ω speakers, the TPA0312 has less than 0.65% THD+N across its specified frequency range. Included
within this device is integrated depop circuitry that virtually eliminates transients that cause noise in the speakers.
Amplifier gain is internally configured and controlled by way of two terminals (GAIN0 and GAIN1). BTL gain
settings of 6 dB, 10 dB, 15.6 dB, and 21.6 dB (inverting) are provided, whereas SE gain is always configured as
4.1 dB for headphone drive. An internal input MUX allows two sets of stereo inputs to the amplifier. The HP/LINE
terminal allows the user to select which MUX input is active, regardless of whether the amplifier is in SE or BTL
mode. In notebook applications, where internal speakers are driven as BTL and the line outputs (often
headphone drive) are required to be SE, the TPA0312 automatically switches into SE mode when the SE/BTL
input is activated, and this reduces the gain to 4.1 dB.
The TPA0312 consumes only 6 mA of supply current during normal operation. A miserly shutdown mode
reduces the supply current to 150 µA.
The PowerPAD™ package (PWP) delivers a level of thermal performance that was previously achievable only in
TO-220-type packages. Thermal impedances of approximately 35
°C/W are readily realized in multilayer PCB
applications. This allows the TPA0312 to operate at full power into 8-
Ω loads at an ambient temperature of 85°C.
AVAILABLE OPTIONS
PACKAGED DEVICE
TA
TSSOP(1) (PWP)
–40
°C to 85°C
TPA0312PWP
(1)
The PWP package is available taped and reeled. To order a taped
and reeled part, add the suffix R to the part number (e.g.,
TPA0312PWPR).
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.
PowerPAD is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 2000–2004, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.




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