TS4984
2 x 1W Stereo audio power amplifier
with active low standby mode
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Operating from V
CC
=2.2V to 5.5V
1W output power per channel @ V
CC
=5V,
THD+N=1%, RL=8Ω
10nA standby current
62dB PSRR @ 217Hz with grounded inputs
High SNR: 100dB(A) typ.
Near-zero pop & click
Available in QFN16 4x4 mm, 0.5mm pitch,
leadfree package
Pin Connections (top view)
TS4984IQ — TQFN16 4x4mm
Description
The TS4984 has been designed for top of the
class stereo audio applications. Thanks to its
compact and power dissipation efficient QFN
package, it suits various applications.
With a BTL configuration, this Audio Power
Amplifier is capable of delivering 1W per channel
of continuous RMS output power into an 8
Ω
load
@ 5V.
An externally controlled standby mode control
reduces 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.
IN- L
IN+ L
BYPASS L
NC
VO-L VO+L VCC1 VCC2
16 15
1
2
3
4
5
6
14
13
12
11
10
9
STBY
BYPASS R
IN+ R
IN- R
7
8
GND1 GND2 VO+R VO-R
Applications
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Cellular mobile phones
Notebook computers & PDAs
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LCD monitors & TVs
Portable audio devices
Order Codes
Part Number
TS4984IQT
Temperature Range
-40, +85°C
Package
QFN
Packaging
Tape & Reel
Marking
K984
January 2005
Revision 1
1/29
TS4984
1
Typical Application
Typical Application
Figure 1
shows a schematic view of a typical audio amplification application using the TS4984.
Table 1
describes the components used in this typical application.
Figure 1: Typical application schematic
Cfeed-L
Rfeed-L
22k
VCC
+
14
13
Cs
1u
U1
VCC1
1
Input L
GND
Cin-L
100n
Rin-L
22k
IN-L
-
VO-L
16
2
IN+L
+
VCC
1
2
3
VCC2
-
12
Standby
Bypass L
Bias
AV = -1
+
Neg. Output L
VO+L
15
Pos. Output L
3
+
Cb
1u
Wire optional
Internal connection
Cin-R
Input R
GND
100n
22k
10
IN+R
+
VO-R
8
Rin-R
9
IN-R
-
-
AV = -1
11
Neg. Output R
VO+R
7
Pos. Output R
Bypass R
+
GND1
GND2
TS4984
5
Cfeed-R
Rfeed-R
22k
Table 1: External component descriptions
Components
R
IN L,R
C
IN L,R
R
FEED L,R
C
S
C
B
A
V L, R
Functional Description
Inverting input resistors which sets the closed loop gain in conjunction with
R
feed
. These resistors
also form a high pass filter with
C
IN
(fc = 1 / (2 x Pi x R
IN
x C
IN
)).
Input coupling capacitors which blocks the DC voltage at the amplifier input terminal.
Feedback resistors which sets the closed loop gain in conjunction with
R
IN
.
Supply Bypass capacitor which provides power supply filtering.
Bypass pin capacitor which provides half supply filtering.
Closed loop gain in BTL configuration =
2 x (R
FEED
/ R
IN
) on each channel.
2/29
6
Absolute maximum ratings and operating conditions
2
Absolute maximum ratings and operating conditions
TS4984
Table 2: Key parameters and their absolute maximum ratings
Symbol
V
CC
V
i
T
oper
T
stg
T
j
R
thja
P
d
ESD
ESD
Supply voltage
1
Input Voltage
2
Operating Free Air Temperature Range
Storage Temperature
Maximum Junction Temperature
Thermal Resistance Junction to Ambient
QFN16
Power Dissipation
Human Body Model
3
Machine Model
Latch-up Immunity
Parameter
Value
6
GND to V
CC
-40 to + 85
-65 to +150
150
120
Internally Limited
2
200
200mA
kV
V
Unit
V
V
°C
°C
°C
°C/W
1) All voltages values are measured with respect to the ground pin
2) The magnitude of input signal must never exceed V
CC
+ 0.3V / GND - 0.3V
3) The voltage value is measured with respect from pin to supply
Table 3: Operating conditions
Symbol
V
CC
V
ICM
V
STB
R
L
T
SD
R
THJA
Supply Voltage
Common Mode Input Voltage Range
Standby Voltage Input:
Device ON
Device OFF
Load Resistor
Thermal Shutdown Temperature
Thermal Resistance Junction to Ambient
QFN16
1
QFN16
2
Parameter
Value
2.2 to 5.5
1.2V to V
CC
1.35
≤
V
STB
≤
V
CC
GND
≤
V
STB
≤
0.4
Unit
V
V
V
≥
4
≥
1
150
45
85
Ω
M
Ω
°C
°C/W
R
OUTGND
Resistor Output to GND (V
STB
= GND)
1) When mounted on a 4-layer PCB with via
2) When mounted on a 2 layer PCB
3/29
TS4984
3
Electrical characteristics
Electrical characteristics
Table 4: Electrical characteristics for V
CC
= +5V, GND = 0V, T
amb
= 25°C (unless otherwise
specified)
Symbol
I
CC
I
STANDBY
Voo
P
out
THD + N
Supply Current
No input signal, no load
Standby Current
1
No input signal, Vstdby = G
ND
, RL = 8
Ω
Output Offset Voltage
No input signal, RL = 8
Ω
Output Power
THD = 1% Max, F = 1kHz, RL = 8
Ω
Total Harmonic Distortion + Noise
Po = 1Wrms, Av = 2, 20Hz
≤
F
≤
20kHz, RL = 8
Ω
Power Supply Rejection Ratio
2
RL = 8
Ω,
Av = 2
,
Vripple = 200mVpp, Input Grounded
F = 217Hz
F = 1kHz
Channel Separation, R
L
= 8
Ω
F = 1kHz
F = 20Hz to 20kHz
Wake-Up Time (Cb = 1µF)
Standby Time (Cb = 1µF)
Standby Voltage Level High
Standby Voltage Level Low
Phase Margin at Unity Gain
R
L
= 8
Ω
, C
L
= 500pF
Gain Margin
R
L
= 8
Ω
, C
L
= 500pF
Gain Bandwidth Product
R
L
= 8
Ω
65
15
1.5
0.8
Parameter
Min.
Typ.
7.4
10
Max.
12
1000
Unit
mA
nA
mV
W
%
1
1
0.2
10
PSRR
55
55
62
64
-92
-70
90
10
1.3
0.4
130
dB
Crosstalk
T
WU
T
STDB
V
STDBH
V
STDBL
dB
ms
µs
V
V
Degrees
dB
MHz
Φ
M
GM
GBP
1) Standby mode is activated when Vstdby is tied to Gnd.
2) All PSRR data limits are guaranteed by production sampling tests
Dynamic measurements -
20*log(rms(Vout)/rms(Vripple)).
Vripple is the sinusoidal signal superimposed upon Vcc.
4/29
Electrical characteristics
TS4984
Table 5: Electrical characteristics for V
CC
= +3.3V, GND = 0V, T
amb
= 25°C (unless otherwise
specified)
Symbol
I
CC
I
STANDBY
Voo
P
out
THD + N
Supply Current
No input signal, no load
Standby Current
1
No input signal, Vstdby = G
ND
, RL = 8
Ω
Output Offset Voltage
No input signal, RL = 8
Ω
Output Power
THD = 1% Max, F = 1kHz, RL = 8
Ω
Total Harmonic Distortion + Noise
Po = 400mWrms, Av = 2, 20Hz
≤
F
≤
20kHz, RL = 8
Ω
Power Supply Rejection Ratio
2
RL = 8
Ω,
Av = 2
,
Vripple = 200mVpp, Input Grounded
F = 217Hz
F = 1kHz
Channel Separation, R
L
= 8
Ω
F = 1kHz
F = 20Hz to 20kHz
Wake-Up Time (Cb = 1µF)
Standby Time (Cb = 1µF)
Standby Voltage Level High
Standby Voltage Level Low
Phase Margin at Unity Gain
R
L
= 8
Ω
, C
L
= 500pF
Gain Margin
R
L
= 8
Ω
, C
L
= 500pF
Gain Bandwidth Product
R
L
= 8
Ω
65
15
1.5
300
Parameter
Min.
Typ.
6.6
10
Max.
12
1000
Unit
mA
nA
mV
mW
%
1
450
0.1
10
PSRR
55
55
61
63
-94
-68
110
10
1.2
0.4
140
dB
Crosstalk
T
WU
T
STDB
V
STDBH
V
STDBL
dB
ms
µs
V
V
Degrees
dB
MHz
Φ
M
GM
GBP
1) Standby mode is activated when Vstdby is tied to Gnd
2) All PSRR data limits are guaranteed by production sampling tests
Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the sinusoidal signal superimposed upon Vcc.
5/29
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