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STMicroelectronics |
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TS4985
2 X 1.2W Stereo Audio Power Amplifier with
Dedicated Standby Pins
■ Operating from VCC=2.2V to 5.5V
■ 1.2W output power per channel @ VCC=5V,
THD+N=1%, RL=8Ω
■ 10nA standby current
■ 62dB PSRR @ 217Hz with grounded inputs
■ High SNR: 106dB(A) typ.
■ Near zero pop & click
■ Lead-free 15 bumps, flip-chip package
Description
The TS4985 has been designed for top-class
stereo audio applications. Thanks to its compact
and power-dissipation efficient flip-chip package,
it suits various applications.
With a BTL configuration, this audio power
amplifier is capable of delivering 1.2W per
channel of continuous RMS output power into an
8Ω load @ 5V.
Each output channel (left and right), has an
external controlled standby mode pin (STDBYL &
STDBYR) to reduce the supply current to less
than 10nA per channel. The device also features
an internal thermal shutdown protection.
The gain of each channel can be configured by
external gain setting resistors.
Flip-chip - 15 bumps
Pin Connection (top view)
VCC1
VO-L
IN-L
VCC2
VO+L
IN+L
STDBYL
BYPASS
STDBYR
IN+R
VO+R
GND2
IN-R
VO-R
GND1
Applications
■ Cellular mobile phones
■ Notebook & PDA computers
■ LCD monitors & TVs
■ Portable audio devices
Order Codes
Part Number
TS4985EIJT
TS4985EKIJT
Temperature Range
-40, +85°C
Package
Lead free flip-chip
Lead free flip-chip +
back coating
Packaging
Tape & Reel
Marking
A85
May 2005
Rev 2
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Typical Application Schematic
www.DataSTheSe4t49U8.c5om
1 Typical Application Schematic
Figure 1 shows a typical application schematic for the TS4985.
Figure 1. Application schematic
Input L
GND
Cin-L
100n
Rin-L
22k
VCC
1
2
3
Cb
1u
Cfeed-L
Rfeed-L
22k
VCC
Cs
1u
A5 B6
A1 IN-L -
B2 IN+L +
C5
Standby L
Bias
C3 Bypass
VO-L A3
-
AV = -1
+
VO+L B4
Input R
GND
Cin-R
100n
Rin-R
22k
VCC
1
2
3
D6 IN+R +
E5 IN-R -
C1
Standby R
VO-R E3
-
AV = -1
+
VO+R D4
Neg. Output L
Pos. Output L
Neg. Output R
Pos. Output R
Cfeed-R
Rfeed-R
22k
E1 D2
TS4985
Table 1. External component descriptions
Components
Functional Description
RIN L,R
CIN L,R
RFEED L,R
CS
CB
AV L, R
Inverting input resistors which sets the closed loop gain in
conjunction with Rfeed. These resistors also form a high pass
filter with CIN (fc = 1 / (2 x Pi x RIN x CIN))
Input coupling capacitors which blocks the DC voltage at the
amplifier input terminal
Feedback resistors which sets the closed loop gain in
conjunction with RIN
Supply Bypass capacitor which provides power supply filtering
Bypass pin capacitor which provides half supply filtering
Closed loop gain in BTL configuration = 2 x (RFEED / RIN) on
each channel
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