October 2008 Rev 2 1/14
1
TDA7389A
4 x 45W quad bridge car radio amplifier
Features
■High output power:
– 4 x 45 W / 4 Ω max.
– 4 x 28 W / 4 Ω @ 14.4 V, 1 kHz, 10 %
■Low distortion
■Low output noise
■Standby function
■Mute function
■Automute at min. supply voltage detection
■Low external component count:
– Internally fixed gain (26dB)
– No external compensation
– No bootstrap capacitors
■Clipping detector
■Offset detector
■Diagnostic facility for:
– Out to GND short
– Out to V
S
short
– Thermal shutdown
Protections:
■Output short circuit to GND, to V
S
, across the
load
■Very inductive loads
■Overrating chip temperature with soft thermal
limiter
■Load dump voltage
■Fortuitous open GND
■Output DC offset detector
■Reversed battery
■ESD
Description
The TDA7389A is an AB class audio power
amplifier, packaged in Flexiwatt 27 designed for
high end car radio applications.
Based on the fully complementary PNP/NPN
configuration the TDA7389A allows a rail to rail
output voltage swing with no need of bootstrap
capacitors.
Flexiwatt27
Table 1. Device summary
Order code Package Packing
TDA7389A Flexiwatt27 Tube
www.st.com
Contents TDA7389A
2/14
Contents
1 Pin connection and block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5 Test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TDA7389A List of tables
3/14
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 5. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
List of figures TDA7389A
4/14
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4. Quiescent output voltage vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Output power vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6. Maximum output power vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 7. Distortion vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 8. Distortion vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 9. Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 10. Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 11. Output noise vs. source resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 12. Power dissipation and efficiency vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 13. ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . . 9
Figure 14. Test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 15. Flexiwatt27 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
TDA7389A Pin connection and block diagrams
5/14
1 Pin connection and block diagrams
Figure 1. Block diagram
Figure 2. Pin connection (top view)
IN1
MUTE
ST-BY
IN2
OUT1+
OUT1-
OUT2+
OUT2-
PW-GND
IN3
IN4
OUT3+
OUT3-
OUT4+
OUT4-
PW-GND
PW-GND
PW-GND
D05AU1613
AC-GND SVR TAB S-GND
Vcc1 Vcc2
CD
OFFSET
DETECTOR
FLEX27_O
OFF.DET
TAB
TAB
127
P-GND2
OUT2-
ST-BY
OUT2+
VCC
OUT1-
P-GND1
OUT1+
SVR
IN1
IN2
S-GND
IN4
IN3
AC-GND
OUT3+
P-GND3
OUT3-
VCC
OUT4+
MUTE
OUT4-
P-GND4
CD
Electrical specifications TDA7389A
6/14
2 Electrical specifications
2.1 Absolute maximum ratings
2.2 Thermal data
2.3 Electrical characteristics
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
S
Operating supply voltage 18 V
V
S (DC)
DC supply voltage 28 V
V
S (pk)
Peak supply voltage (t = 50ms) 50 V
I
O
Output peak current:
Repetitive (duty cycle 10% at f = 10Hz)
Non repetitive (t = 100μs)
4.5
5.5
A
P
tot
Power dissipation, (T
case
= 70°C) 80 W
T
j
Junction temperature 150 °C
T
stg
Storage temperature – 55 to 150 °C
Table 3. Thermal data
Symbol Parameter Value Unit
R
th j-case
Thermal resistance junction to case max. 1 °C/W
Table 4. Electrical characteristics
(VS = 14.4V; f = 1KHz; Rg = 600Ω; RL = 4Ω; Tamb = 25°C; Refer to the test and application
diagram (Figure 14), unless otherwise specified.)
Symbol Parameter Test condition Min. Typ. Max. Unit
I
q1
Quiescent current R
L
= ∞ 150 350 mA
V
OS
Output offset voltage Play Mode ±80 mV
dV
OS
During mute on/off output
offset voltagef ITU R-ARM weighted
see Figure 13
-10 10
mV
During standby on/off output
offset voltage -50 50
G
v
Voltage gain 25 26 27 dB
ΔG
v
Channel gain unbalance ±1 dB
P
o
Output power THD = 10%; V
S
= 14.4V 26 28 W
P
o max
Max.output power(1) V
S
= 14.4V 41 45 W
TDA7389A Electrical specifications
7/14
THD Distortion P
o
= 4W 0.04 0.10 %
e
No
Output noise "A" Weighted 50 70 μV
Bw = 20 Hz to 20 kHz 70 100 μV
SVR Supply voltage rejection f = 100Hz; V
r
= 1V
rms
50 75 dB
f
ch
High cut-off frequency P
o
= 0.5W 100 200 KHz
R
i
Input Impedance 70 100 150 KΩ
C
T
Cross talk f = 1 kHz; Po = 4W 60 75 dB
f = 10 kHz; Po = 4W 60 dB
I
SB
Standby current
consumption
V
St-by
= 1.2V 50
μA
V
St-by
= 0V 25
I
pin4
Standby pin current V
St-by
= 1.2 to 2.6V ±1 μA
V
SB out
Standby Out threshold
voltage (Amp: On) 2.6 V
V
SB IN
Standby In threshold voltage (Amp: Off) 1.2 V
A
M
Mute attenuation P
Oref
= 4 W 80 90 dB
V
M out
Mute Out threshold voltage (Amp: play) 2.6 V
V
M in
Mute In threshold voltage (Amp: mute) 1.2 V
V
AM in
V
S
automute threshold
(Amp: mute); Att ≥ 80 dB;
P
Oref
= 4 Ω
(Amp: play); Att < 0.1 dB;
P
O
= 0.5 W 7.6
6.5
8.5
V
I
pin22
Muting pin current
V
MUTE
= 1.2 V
(Source current) 51120
μA
V
MUTE
= 2.6 V -5 - -20
Offset detector
OD
LK
OD leakage current 1 µA
V
off
Detected diff. output offset V
St-by
=5 V 1.5 ±2 2.5 V
V
Pin2_Fw27
Pin2_Fw27 voltage
for Detection = True
I
pin2
= 1 mA
V
St-by
=5V; |V
off
| > 2.5 V 0.2 0.4 V
Clipping detector
CD
LK
Clip det high leakage current CD Off 1 μA
CD
SAT
Clip det sat voltage DC On; I
CD
= 1 mA 0.2 0.4 V
CD
THD
Clip det THD level Po > 16 W 2 %
1. Saturated square wave output.
Table 4. Electrical characteristics (continued)
(VS = 14.4V; f = 1KHz; Rg = 600Ω; RL = 4Ω; Tamb = 25°C; Refer to the test and application
diagram (Figure 14), unless otherwise specified.)
Symbol Parameter Test condition Min. Typ. Max. Unit
Electrical specifications TDA7389A
8/14
2.4 Electrical characteristic curves
Figure 3. Quiescent current vs. supply
voltage
Figure 4. Quiescent output voltage vs.
supply voltage
Figure 5. Output power vs. supply voltage
Figure 6. Maximum output power vs. supply
voltage
Figure 7. Distortion vs. output power
Figure 8. Distortion vs. frequency
120
130
140
150
160
170
180
8 1012141618
V
S
(V)
I
d
(mA)
V
in
= 0
R
L
= 4Ω
AC00483
3
4
5
6
7
8
9
10
8 9 10 11 12 13 14 15 16 17 18
V
s (V)
Vo (V)
Vi = 0
RL = 4Ω
AC00484
5
10
15
20
25
30
35
40
45
50
8 9 10 11 12 13 14 15 16 17 18
Vs (V)
P
o
(W)
R
L
= 4Ω
f = 1 KHz
THD = 10%
THD = 1%
AC00485
10
15
20
25
30
35
40
45
50
55
60
65
70
8 9 10 11 12 13 14 15 16 17 18
V
s
(V)
P
o
(W)
AC00486
0.01
0.1
1
10
0.1 1 10 100
P
o
(W)
THD (%)
V
s
= 14.4V
R
L
= 4Ω
f = 10 KHz
f = 1 KHz
AC00487
0.01
0.1
1
10
10 10
2
10
3
10
4
10
5
f (Hz)
THD (%)
Vs = 14.4V
RL = 4Ω
Po = 4W
AC00488
TDA7389A Electrical specifications
9/14
Figure 9. Supply voltage rejection vs.
frequency
Figure 10. Crosstalk vs. frequency
Figure 11. Output noise vs. source resistance
Figure 12. Power dissipation and efficiency
vs. output power
Figure 13. ITU R-ARM frequency response,
weighting filter for transient pop
20
30
40
50
60
70
80
90
100
10 10
2
10
3
10
4
10
5
f (Hz)
SVR (dB)
AC0048
9
R
g
= 600Ω
V
ripple
= 1 Vrms
30
40
50
60
70
80
90
100
10 10
2
10
3
10
4
10
5
f (Hz)
SVR (dB)
R
L
= 4Ω
P
o
= 4W
R
g
= 600Ω
AC0049
0
0
20
40
60
80
100
120
140
160
180
11010
2
10
3
10
4
10
5
R
g
(Ω)
E
n
(µV)
V
s
= 14.4V
R
L
= 4Ω
22-22K Hz lin
"A" wgtd
AC00491
0
10
20
30
40
50
60
70
80
024681012141618202224
Po (W)
Pdiss (W)
0
10
20
30
40
50
60
70
80
Vs = 13.2V
RL = 4 x 4Ω
f = 1 KHz
η (%)
Pdiss
η
AC0049
2
Output attenuation (dB)
-50
-40
-30
-20
-10
0
10
10
Hz
AC00343
10
2
10
3
10
4
10
5
Electrical specifications TDA7389A
10/14
2.5 Test and application circuit
Figure 14. Test and application circuit
IN1
0.1μF
C9
1μF
IN2
C2 0.1μF
OUT1
OUT2
IN3
C3 0.1μF
IN4
C4 0.1μF
OUT3
OUT4
D05AU1614A
C5
0.47μF
C6
47μF
SVR TAB
Vcc1-2 Vcc3-4
C8
0.1μF
C7
2200μF
C10
1μF
ST-BY
R1
10K
R2
47K
MUTE
C1
15
16
13
12
23
5
14
S-GND
17 11 26 1, 27
CD OUT
721
10
9
8
6
3
4
18
19
20
22
25
24
2
OFFSET
DETECTOR OUT
47K
R4
V
47K
R3 V
CD
TDA7389A Application hints
11/14
3 Application hints
Ref. to the circuit of Figure 14.
3.1 SVR
Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF
time sequence and, consequently, plays an essential role in the pop optimization during
ON/OFF transients.
To conveniently serve both needs, its minimum recommended value is 22µF, 47µF can
be used to optimize pop performances.
3.2 Input stage
The TDA7389A’s inputs are ground-compatible and can stand very high input signals (±
8Vpk) without any performances degradation.
If the standard value for the input capacitors (0.1µF) is adopted, the low frequency cut-off
will amount to 16 Hz.
The input capacitors should be 1/4 of the capacitor connected to AC-GND pin for optimum
pop performances.
3.3 Standby and muting
Standby and muting facilities are both 3.3 V CMOS-compatible. If unused, a straight
connection to Vs of their respective pins would be admissible.
Conventional/low-power transistors can be employed to drive muting and stand-by pins in
absence of true CMOS ports or microprocessors. R-C cells have always to be used in order
to smooth down the transitions for preventing any audible transient noises.
Since a DC current of about 10µA normally flows out of pin 23, the maximum allowable
muting-series resistance (R
2
) is 70 kΩ, which is sufficiently high to permit a muting capacitor
reasonably small (about 1µF).
If R
2
is higher than recommended, the involved risk will be that the voltage at pin 23 may rise
to above the 1.2 V threshold voltage and the device will consequently fail to turn OFF when
the mute line is brought down.
About the stand-by, the time constant to be assigned in order to obtain a virtually pop-free
transition has to be slower than 2.5V/ms.
Package information TDA7389A
12/14
4 Package information
In order to meet environmental requirements, ST (also) offers these devices in ECOPACK®
packages. ECOPACK® packages are lead-free. The category of second Level Interconnect
is marked on the package and on the inner box label, in compliance with JEDEC Standard
JESD97. The maximum ratings related to soldering conditions are also marked on the inner
box label.
ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
Figure 15. Flexiwatt27 mechanical data and package dimensions
OUTLINE AND
MECHANICAL DATA
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 4.45 4.50 4.65 0.175 0.177 0.183
B 1.80 1.90 2.00 0.070 0.074 0.079
C 1.40 0.055
D 0.75 0.90 1.05 0.029 0.035 0.041
E 0.37 0.39 0.42 0.014 0.015 0.016
F (1) 0.57 0.022
G 0.80 1.00 1.20 0.031 0.040 0.047
G1 25.75 26.00 26.25 1.014 1.023 1.033
H (2) 28.90 29.23 29.30 1.139 1.150 1.153
H1 17.00 0.669
H2 12.80 0.503
H3 0.80 0.031
L (2) 22.07 22.47 22.87 0.869 0.884 0.904
L1 18.57 18.97 19.37 0.731 0.747 0.762
L2 (2) 15.50 15.70 15.90 0.610 0.618 0.626
L3 7.70 7.85 7.95 0.303 0.309 0.313
L4 5 0.197
L5 3.5 0.138
M 3.70 4.00 4.30 0.145 0.157 0.169
M1 3.60 4.00 4.40 0.142 0.157 0.173
N 2.20 0.086
O 2 0.079
R 1.70 0.067
R1 0.5 0.02
R2 0.3 0.12
R3 1.25 0.049
R4 0.50 0.019
V5˚ (Typ.)
V1 3˚ (Typ.)
V2 20˚ (Typ.)
V3 45˚ (Typ.)
(1): dam-bar protusion not included
(2): molding protusion included
Flexiwatt27 (vertical)
H3
R4
G
V
V
G1
L2
H1
H
F
M1
L
FLEX27ME
V3
OL3 L4
H2
R3
N
V2
R
R2
R2
C
B
L1
M
R1
L5 R1 R1
E
D
A
V1
V1
7139011
Pin 1
TDA7389A Revision history
13/14
5 Revision history
Table 5. Document revision history
Date Revision Changes
14-Nov-2007 1Initial release.
20-Oct-2008 2Updated the Table 3: Thermal data on page 6.
TDA7389A
14/14
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