ST TS4990 User Manual
TS4990
1.2 W audio power amplifier with active-low standby mode
Features
■ Operating range from V
■ 1.2 W output power at V
F = 1 kHz, with 8 Ω load
■ Ultra-low consumption in standby mode (10 nA)
■ 62 dB PSRR at 217 Hz in grounded mode
■ Near-zero pop and click
■ Ultra-low distortion (0.1%)
■ Unity gain stable
■ Available in 9-bump flip-chip, miniSO-8 and
DFN8 packages
= 2.2 V to 5.5 V
CC
= 5 V, THD = 1%,
CC
Applications
■ Mobile phones (cellular / cordless)
■ Laptop / notebook computers
■ PDAs
■ Portable audio devices
Description
The TS4990 is designed for demanding audio
applications such as mobile phones to reduce the
number of external components.
This audio power amplifier is capable of delivering
1.2 W of continuous RMS output power into an
8 Ω load at 5 V.
TS4990IJT/TS4990EIJT - Flip-chip 9 bumps
Vin+
Vin+
VOUT1 GND
VOUT1 GND
Vin- GND BYPASS
Vin- GND BYPASS
VCC
VCC
STBY
STBY
VOUT2
VOUT2
TS4990IST - MiniSO-8
TS4990IQT - DFN8
STANDBY
BYPASS
V
IN+
V
IN–
1
2
3
4
V
8
OUT2
7
GND
V
6
CC
V
5
OUT1
An externally controlled standby mode reduces
TS4990ID/TS4990IDT - SO-8
the supply current to less than 10 nA. It also
includes an internal thermal shutdown protection.
STBY
STBY
1
1
8
8
VOUT2
VOUT2
The unity-gain stable amplifier can be configured
2
VIN+
VIN+
VIN-
VIN-
2
3
3
4
4
by external gain setting resistors.
BYPASS
BYPASS
August 2011 Doc ID 9309 Rev 13 1/33
7
7
6
6
5
5
GND
GND
V
V
CC
CC
VOUT1
VOUT1
www.st.com
33
Contents TS4990
Contents
1 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3
2 Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1 BTL configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2 Gain in a typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3 Low and high frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.4 Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.5 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6 Wake-up time (t
4.7 Standby time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.8 Pop performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.9 Application example: differential input, BTL power amplifier . . . . . . . . . . 23
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
WU
5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.1 Flip-chip package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.2 MiniSO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.3 DFN8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.4 SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2/33 Doc ID 9309 Rev 13
TS4990 Absolute maximum ratings and operating conditions
1 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings (AMR)
Symbol Parameter Value Unit
(2)
(1)
6V
GND to V
CC
V
T
T
CC
V
oper
stg
T
Supply voltage
in
Input voltage
Operating free-air temperature range -40 to + 85 °C
Storage temperature -65 to +150 °C
j
Maximum junction temperature 150 °C
Thermal resistance junction to ambient
R
thja
P
diss
ESD
Flip-chip
(3)
MiniSO-8
DFN8
Power dissipation Internally limited
HBM: Human body model
MM: Machine model
(4)
(5)
250
215
120
2
200
°C/W
kV
Latch-up immunity 200 mA
Lead temperature (soldering, 10sec)
Lead temperature (soldering, 10sec) for lead-free version
1. All voltage values are measured with respect to the ground pin.
2. The magnitude of the input signal must never exceed V
3. The device is protected in case of over temperature by a thermal shutdown active at 150° C.
4. Human body model: A 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ resistor
between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.
5. Machine model: A 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the
device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of connected pin combinations
while the other pins are floating.
Table 2. Operating conditions
+ 0.3 V / GND - 0.3 V.
CC
250
260
°C
V
V
Symbol Parameter Value Unit
V
CC
V
icm
Supply voltage 2.2 to 5.5 V
Common mode input voltage range 1.2V to V
CC
Standby voltage input:
V
STBY
R
T
SD
Device ON
Device OFF
L
Load resistor ≥ 4 Ω
1.35 ≤ V
GND ≤ V
Thermal shutdown temperature 150 °C
STBY
STBY
≤ V
≤ 0.4
CC
Thermal resistance junction to ambient
R
thja
Flip-chip
MiniSO-8
DFN8
1. This thermal resistance is reached with a 100 mm2 copper heatsink surface.
2. When mounted on a 4-layer PCB.
(1)
(2)
100
190
40
Doc ID 9309 Rev 13 3/33
V
V
°C/W
Typical application schematics TS4990
2 Typical application schematics
Figure 1. Typical application schematics
Rfeed
Cfeed Vcc
+
Cs
Audio In
Table 3. Component descriptions
Cin
Standby
Control
Rin
Cb
Vin-
-
Vin+
+
Bypass
Standby
+
Bias
VCC
-
AV = -1
+
GND
Component Functional description
R
in
Inverting input resistor that sets the closed loop gain in conjunction with R
resistor also forms a high pass filter with Cin (Fc = 1 / (2 x Pi x Rin x Cin)).
Vout 1
Vout 2
TS4990
Speaker
8Ohms
feed
. This
C
in
R
feed
C
s
C
b
C
feed
A
V
Exposed pad
Input coupling capacitor that blocks the DC voltage at the amplifier input terminal.
Feed back resistor that sets the closed loop gain in conjunction with Rin.
Supply bypass capacitor that provides power supply filtering.
Bypass pin capacitor that provides half supply filtering.
Low pass filter capacitor allowing to cut the high frequency (low pass filter cut-off
frequency 1/ (2 x Pi x R
feed
x C
feed
Closed loop gain in BTL configuration = 2 x (R
DFN8 exposed pad is electrically connected to pin 7. See DFN8 package
information on page 29 for more information.
4/33 Doc ID 9309 Rev 13
)).
feed
/ Rin).
TS4990 Electrical characteristics
3 Electrical characteristics
Table 4. Electrical characteristics when VCC= +5 V, GND = 0 V, T
(unless otherwise specified)
Symbol Parameter Min. Typ. Max. Unit
amb
=25°C
I
I
STBY
V
P
THD + N
PSRR
Supply current
CC
No input signal, no load
Standby current
No input signal, V
Output offset voltage
oo
No input signal, RL = 8 Ω
Output power
out
THD = 1% max, F = 1kHz, R
Total harmonic distortion + noise
= 1W
P
out
, AV = 2, 20Hz ≤ F ≤ 20kHz, RL = 8 Ω
rms
Power supply rejection ratio
RL = 8 Ω, AV = 2, V
F = 217Hz
(1)
= GND, RL = 8Ω
STBY
= 8 Ω
L
(2)
= 200mVpp, input grounded
ripple
F = 1kHz
t
WU
t
STBY
V
STBYH
V
STBYL
Φ
GM
GBP
R
OUT-GND
1. Standby mode is active when V
2. All PSRR data limits are guaranteed by production sampling tests.
Dynamic measurements - 20*log(rms(V
V
Wake-up time (Cb = 1 µF) 90 130 ms
Standby time (Cb = 1 µF) 10 µs
Standby voltage level high 1.3 V
Standby voltage level low 0.4 V
Phase margin at unity gain
M
RL = 8 Ω, CL = 500 pF
Gain margin
R
= 8 Ω, CL = 500 pF
L
Gain bandwidth product
= 8 Ω
R
L
Resistor output to GND (V
V
out1
V
out2
.
CC
STBY
≤ V
STBY
is tied to GND.
out
)/rms(V
STBYL
ripple
)
)). V
is the sinusoidal signal superimposed upon
ripple
3.7 6 mA
10 1000 nA
110mV
0.9 1.2 W
0.2 %
55
55
62
64
dB
65 Degrees
15 dB
1.5 MHz
3
kΩ
43
Doc ID 9309 Rev 13 5/33
Electrical characteristics TS4990
Table 5. Electrical characteristics when VCC= +3.3 V, GND = 0 V, T
amb
= 25°C
(unless otherwise specified)
Symbol Parameter Min. Typ. Max. Unit
I
CC
I
STBY
V
P
Supply current
No input signal, no load
Standby current
No input signal, V
Output offset voltage
oo
No input signal, RL = 8 Ω
Output power
out
THD = 1% max, F = 1 kHz, RL = 8 Ω
(1)
STBY
= GND, RL = 8 Ω
Total harmonic distortion + noise
THD + N
= 400 mW
P
out
, AV = 2, 20 Hz ≤ F ≤ 20 kHz,
rms
RL=8 Ω
(2)
= 200mVpp, input grounded
PSRR
Power supply rejection ratio
RL = 8 Ω, AV = 2, V
ripple
F = 217 Hz
F = 1 kHz
t
WU
t
STBY
V
STBYH
V
STBYL
Φ
GM
GBP
R
OUT-GND
1. Standby mode is active when V
2. All PSRR data limits are guaranteed by production sampling tests.
Dynamic measurements - 20*log(rms(V
V
Wake-up time (Cb = 1 µF) 110 140 ms
Standby time (Cb = 1 µF) 10 µs
Standby voltage level high 1.2 V
Standby voltage level low 0.4 V
Phase margin at unity gain
M
RL = 8 Ω, CL = 500 pF
Gain margin
= 8 Ω, CL = 500 pF
R
L
Gain bandwidth product
= 8 Ω
R
L
Resistor output to GND (V
V
out1
V
out2
.
CC
STBY
≤ V
STBY
is tied to GND.
out
)/rms(V
STBYL
ripple
)). V
)
is the sinusoidal signal superimposed upon
ripple
3.3 6 mA
10 1000 nA
110mV
375 500 mW
0.1 %
55
55
61
63
dB
65 Degrees
15 dB
1.5 MHz
4
kΩ
44
6/33 Doc ID 9309 Rev 13
TS4990 Electrical characteristics
Table 6. Electrical characteristics when V
= 2.6V, GND = 0V, T
CC
= 25°C (unless
amb
otherwise specified)
Symbol Parameter Min. Typ. Max. Unit
I
CC
I
STBY
V
P
Supply current
No input signal, no load
Standby current
No input signal, V
Output offset voltage
oo
No input signal, RL = 8 Ω
Output power
out
THD = 1% max, F = 1 kHz, RL = 8 Ω
(1)
STBY
= GND, RL = 8 Ω
Total harmonic distortion + noise
THD + N
= 200 mW
P
out
, AV = 2, 20 Hz ≤ F ≤ 20 kHz,
rms
RL=8 Ω
(2)
= 200 mVpp, input grounded
PSRR
Power supply rejection ratio
RL = 8 Ω, AV = 2, V
ripple
F = 217 Hz
F = 1 kHz
t
WU
t
STBY
V
STBYH
V
STBYL
Φ
GM
GBP
R
OUT-GND
1. Standby mode is active when V
2. All PSRR data limits are guaranteed by production sampling tests.
Dynamic measurements - 20*log(rms(V
V
Wake-up time (Cb = 1 µF) 125 150 ms
Standby time (Cb = 1 µF) 10 µs
Standby voltage level high 1.2 V
Standby voltage level low 0.4 V
Phase margin at unity gain
M
RL = 8 Ω, CL = 500 pF
Gain margin
= 8 Ω, CL = 500 pF
R
L
Gain bandwidth product
= 8 Ω
R
L
Resistor output to GND (V
V
out1
V
out2
.
CC
STBY
≤ V
STBY
is tied to GND.
out
)/rms(V
STBYL
ripple
)
)). V
is the sinusoidal signal superimposed upon
ripple
3.1 6 mA
10 1000 nA
110mV
220 300 mW
0.1 %
55
55
60
62
dB
65 Degrees
15 dB
1.5 MHz
6
kΩ
46
Doc ID 9309 Rev 13 7/33
Electrical characteristics TS4990
0.1 1 10 100 1000 10000
-60
-40
-20
0
20
40
60
-200
-160
-120
-80
-40
0
Gain
Phase
Gain (dB)
Frequency (kHz)
Vcc = 3.3V
RL = 8
Ω
Tamb = 25°C
Phase (°)
Figure 2. Open loop frequency response Figure 3. Open loop frequency response
60
40
20
0
Gain (dB)
-20
-40
-60
0.1 1 10 100 1000 10000
Phase
Vcc = 5V
RL = 8
Ω
Tamb = 25°C
Frequency (kHz)
Gain
0
-40
-80
-120
-160
-200
Phase (°)
Figure 4. Open loop frequency response Figure 5. Open loop frequency response
60
40
20
0
Gain (dB)
-20
-40
-60
0.1 1 10 100 1000 10000
Vcc = 2.6V
RL = 8
Ω
Tamb = 25°C
Phase
Gain
Frequency (kHz)
0
-40
-80
-120
-160
-200
100
80
60
40
Phase (°)
20
Gain (dB)
0
-20
-40
0.1 1 10 100 1000 10000
Vcc = 5V
CL = 560pF
Tamb = 25°C
Gain
Phase
Frequency (kHz)
0
-40
-80
-120
-160
-200
Phase (°)
Figure 6. Open loop frequency response Figure 7. Open loop frequency response
100
80
60
40
20
Gain (dB)
0
Vcc = 3.3V
-20
CL = 560pF
Tamb = 25°C
-40
0.1 1 10 100 1000 10000
8/33 Doc ID 9309 Rev 13
Gain
Phase
Frequency (kHz)
0
-40
-80
Phase (°)
-120
-160
-200
100
80
60
40
20
Gain (dB)
0
-20
-40
0.1 1 10 100 1000 10000
Vcc = 2.6V
CL = 560pF
Tamb = 25°C
Gain
Phase
Frequency (kHz)
0
-40
-80
-120
-160
-200
Phase (°)
TS4990 Electrical characteristics
100 1000 10000 100000
-50
-40
-30
-20
-10
0
Vcc :
2.2V
2.6V
3.3V
5V
Vripple = 200mVpp
Av = 10
Input = Grounded
Cb = Cin = 1μF
RL >= 4
Ω
Tamb = 25°C
PSRR (dB)
Frequency (Hz)
100 1000 10000 100000
-60
-50
-40
-30
-20
-10
0
Vcc :
2.2V
2.6V
3.3V
5V
Vripple = 200mVpp
Av = 5
Input = Grounded
Cb = Cin = 1μF
RL >= 4
Ω
Tamb = 25°C
PSRR (dB)
Frequency (Hz)
100 1000 10000 100000
-80
-70
-60
-50
-40
-30
-20
-10
0
Vcc = 2.2, 2.6, 3.3, 5V
Vripple = 200mVpp
Rfeed = 22kΩ
Input = Floating
Cb = 0.1μF
RL >= 4
Ω
Tamb = 25°C
PSRR (dB)
Frequency (Hz)
Figure 8. PSRR vs. power supply Figure 9. PSRR vs. power supply
0
Vripple = 200mVpp
-10
Av = 2
Input = Grounded
-20
Cb = Cin = 1μF
RL >= 4
-30
-40
PSRR (dB)
-50
-60
-70
Ω
Tamb = 25°C
100 1000 10000 100000
Vcc :
2.2V
2.6V
3.3V
5V
Frequency (Hz)
Figure 10. PSRR vs. power supply Figure 11. PSRR vs. power supply
0
Vripple = 200mVpp
-10
Rfeed = 22kΩ
Input = Floating
-20
Cb = 1μF
RL >= 4
-30
-40
PSRR (dB)
-50
-60
-70
-80
Ω
Tamb = 25°C
100 1000 10000 100000
Vcc = 2.2, 2.6, 3.3, 5V
Frequency (Hz)
Figure 12. PSRR vs. power supply Figure 13. PSRR vs. power supply
0
Vripple = 200mVpp
-10
Av = 2
Input = Grounded
Cb = 0.1μF, Cin = 1μF
-20
RL >= 4
Tamb = 25°C
-30
PSRR (dB)
-40
-50
-60
Vcc = 5, 3.3, 2.5 & 2.2V
100 1000 10000 100000
Ω
Frequency (Hz)
Doc ID 9309 Rev 13 9/33
Electrical characteristics TS4990
-5-4-3-2-1012345
-50
-40
-30
-20
-10
0
Vcc = 5V
Vripple = 200mVpp
RL = 8
Ω
Cb = 1μF
AV = 10
Tamb = 25°C
PSRR (dB)
Differential DC Output Voltage (V)
-5-4-3-2-1012345
-60
-50
-40
-30
-20
-10
0
Vcc = 5V
Vripple = 200mVpp
RL = 8
Ω
Cb = 1μF
AV = 5
Tamb = 25°C
PSRR (dB)
Differential DC Output Voltage (V)
-3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0
-50
-40
-30
-20
-10
0
Vcc = 3.3V
Vripple = 200mVpp
RL = 8
Ω
Cb = 1μF
AV = 10
Tamb = 25°C
PSRR (dB)
Differential DC Output Voltage (V)
Figure 14. PSRR vs. DC output voltage Figure 15. PSRR vs. DC output voltage
0
-10
-20
-30
-40
PSRR (dB)
-50
-60
-70
-5-4-3-2-1012345
Vcc = 5V
Vripple = 200mVpp
RL = 8
Ω
Cb = 1μF
AV = 2
Tamb = 25°C
Differential DC Output Voltage (V)
Figure 16. PSRR vs. DC output voltage Figure 17. PSRR vs. DC output voltage
0
-10
-20
-30
PSRR (dB)
-40
Vcc = 3.3V
Vripple = 200mVpp
RL = 8
Ω
Cb = 1μF
AV = 5
Tamb = 25°C
-50
-60
-3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0
Differential DC Output Voltage (V)
Figure 18. PSRR vs. DC output voltage Figure 19. PSRR vs. DC output voltage
0
-10
-20
-30
-40
PSRR (dB)
-50
-60
-70
-3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0
10/33 Doc ID 9309 Rev 13
Vcc = 3.3V
Vripple = 200mVpp
RL = 8
Ω
Cb = 1μF
AV = 2
Tamb = 25°C
Differential DC Output Voltage (V)
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