TPA0252_16 Datasheet, PDF (1/35 Pages) Texas Instruments – 2.8-W STEREO AUDIO POWER AMPLIFIER WITH DIGITAL VOLUME CONTROL

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TPA0252
SLOS288B – JUNE 2000 – REVISED SEPTEMBER 2004
2.8-W STEREO AUDIO POWER AMPLIFIER
WITH DIGITAL VOLUME CONTROL
• Internal Memory Restores Volume Setting
After Shutdown or Power Down
• Digital Volume Control From 20 dB to -40 dB
• 2.8-W/Ch Output Power Into 3-Ω Load
• Stereo Input MUX
• Compatible With PC 99 Desktop Line-Out Into
10-kΩ Load
• Compatible With PC 99 Portable Into 8-Ω Load
• PC-Beep Input
• Depop Circuitry
• Fully Differential Input
• Low Supply Current and Shutdown Current
• Surface-Mount Power Packaging 24-Pin
TSSOP PowerPAD™
LOUT–
SHUTDOWN
PV_DD
UP
DOWN
CLK
BYPASS
PV_DD
VAUX
PC-BEEP
ROUT–
GND
PWP PACKAGE
(TOP VIEW)
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
GND
LOUT+
SE/BTL
LIN
LLINEIN
LHPIN
V_DD
RHPIN
RLINEIN
RIN
HP/LINE
ROUT+
DESCRIPTION
The TPA0252 is a stereo audio power amplifier in a 24-pin TSSOP thermally-enhanced package capable of
delivering 2.8 W of continuous RMS power per channel into 3-Ω loads. This device minimizes the number of
external components needed, which simplifies the design and frees up board space for other features. When
driving 1 W into 8-Ω speakers, the TPA0252 has less than 0.3% THD+N across its specified frequency range.
The integrated depop circuitry virtually eliminates transients that cause noise in the speakers.
Amplifier gain is controlled by two terminals, UP and DOWN. There are 31 discrete steps covering the range of
20 dB (maximum volume setting) to –40 dB (minimum volume setting) in 2 dB steps. By pressing either button
momentarily, the volume steps up or down 2 dB. If a button is held down, the device starts stepping through
volume settings at a rate determined by the capacitor on the CLK terminal.
An internal input MUX, controlled by the HP/LINE pin, allows two sets of stereo inputs to the amplifier. In
notebook applications, where internal speakers are driven as bridge-tied loads (BTL) and the line outputs (often
headphone drive) are required to be single-ended (SE), the TPA0252 automatically switches into SE mode when
the SE/BTL input is activated. This effectively reduces the gain by 6 dB.
The TPA0252 includes a VAUX terminal that is used to power the volume-setting registers when the device is in
SHUTDOWN, and even if the main V_DD power supply is removed. As long as the VAUX terminal is held above 3
V, the registers are maintained. If the VAUX terminal is allowed to go below 3 V, then the data in the registers is
lost, and the default gain of –10 dB is loaded into the registers.
The TPA0252 consumes only 9 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 truly realized in multilayer PCB
applications. This allows the TPA0252 to operate at full power into 8-Ω loads at ambient temperatures of 85°C.
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2004, Texas Instruments Incorporated