SA58631
3 W BTL audio amplifier
Rev. 02 — 12 October 2007
Product data sheet
1. General description
The SA58631 is a one channel audio amplifier in an HVSON8 package. It provides power
output of 3 W with an 8
Ω
load at 9 V supply. The internal circuit is comprised of a BTL
(Bridge Tied Load) amplifier with a complementary PNP-NPN output stage and
standby/mute logic. The SA58631 is housed in an 8-pin HVSON package which has an
exposed die attach paddle enabling reduced thermal resistance and increased power
dissipation.
2. Features
I
I
I
I
I
I
I
I
I
Low junction-to-ambient thermal resistance using exposed die attach paddle
Gain can be fixed with external resistors from 6 dB to 30 dB
Standby mode controlled by CMOS-compatible levels
Low standby current < 10
µA
No switch-on/switch-off plops
High power supply ripple rejection: 50 dB minimum
ElectroStatic Discharge (ESD) protection
Output short circuit to ground protection
Thermal shutdown protection
3. Applications
I
Professional and amateur mobile radio
I
Portable consumer products: toys and games
I
Personal computer remote speakers
NXP Semiconductors
SA58631
3 W BTL audio amplifier
4. Quick reference data
Table 1.
Quick reference data
V
CC
= 5 V; T
amb
= 25
°
C; R
L
= 8
Ω
; f = 1 kHz; V
MODE
= 0 V; measured in test circuit
Figure 3;
unless
otherwise specified.
Symbol
V
CC
I
q
I
stb
P
o
Parameter
supply voltage
quiescent current
standby current
output power
Conditions
operating
R
L
=
∞ Ω
V
MODE
= V
CC
THD+N = 10 %
THD+N = 0.5 %
THD+N = 10 %;
V
CC
= 9 V
THD+N
PSRR
total harmonic distortion-plus-noise P
o
= 0.5 W
power supply rejection ratio
[2]
[3]
[1]
Min
2.2
-
-
1
0.6
-
-
50
40
Typ
9
8
-
1.2
0.9
3.0
0.15
-
-
Max
18
12
10
-
-
-
0.3
-
-
Unit
V
mA
µA
W
W
W
%
dB
dB
[1]
[2]
With a load connected at the outputs the quiescent current will increase, the maximum of this increase
being equal to the DC output offset voltage divided by R
L
.
Supply voltage ripple rejection is measured at the output with a source impedance of R
s
= 0
Ω
at the input.
The ripple voltage is a sine wave with a frequency of 1 kHz and an amplitude of 100 mV (RMS), which is
applied to the positive supply rail.
Supply voltage ripple rejection is measured at the output, with a source impedance of R
s
= 0
Ω
at the input.
The ripple voltage is a sine wave with a frequency between 100 Hz and 20 kHz and an amplitude of
100 mV (RMS), which is applied to the positive supply rail.
[3]
5. Ordering information
Table 2.
Type
number
SA58631TK
Ordering information
Package
Name
HVSON8
Description
Version
plastic thermal enhanced very thin small outline package; SOT909-1
no leads; 8 terminals; body 4 x 4 x 0.85 mm
SA58631_2
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 — 12 October 2007
2 of 21
NXP Semiconductors
SA58631
3 W BTL audio amplifier
6. Block diagram
SA58631
IN−
IN+
V
CC
4
3
6
R
R
5
OUT−
20 kΩ
8
OUT+
SVR
2
20 kΩ
MODE
1
STANDBY/MUTE LOGIC
7
GND
002aac005
Fig 1. Block diagram of SA58631
7. Pinning information
7.1 Pinning
terminal 1
index area
MODE
SVR
IN+
IN−
1
2
8
7
OUT+
GND
V
CC
OUT−
SA58631TK
3
4
6
5
002aac006
Transparent top view
Fig 2. Pin configuration for HVSON8
SA58631_2
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 — 12 October 2007
3 of 21
NXP Semiconductors
SA58631
3 W BTL audio amplifier
7.2 Pin description
Table 3.
Symbol
MODE
SVR
IN+
IN−
OUT−
V
CC
GND
OUT+
Pin description
Pin
1
2
3
4
5
6
7
8
Description
operating mode select (standby, mute, operating)
half supply voltage, decoupling ripple rejection
positive input
negative input
negative output terminal
supply voltage
ground
positive output terminal
8. Functional description
The SA58631 is a single-channel BTL audio amplifier capable of delivering 3 W output
power to an 8
Ω
load at THD+N = 10 % using a 9 V power supply. Using the MODE pin,
the device can be switched to standby and mute condition. The device is protected by an
internal thermal shutdown protection mechanism. The gain can be set within a range of
6 dB to 30 dB by external feedback resistors.
8.1 Power amplifier
The power amplifier is a Bridge Tied Load (BTL) amplifier with a complementary
PNP-NPN output stage. The voltage loss on the positive supply line is the saturation
voltage of a PNP power transistor, on the negative side the saturation voltage of an NPN
power transistor. The total voltage loss is < 1 V. With a supply voltage of 9 V and an 8
Ω
loudspeaker, an output power of 3 W can be delivered to the load.
8.2 Mode select pin (MODE)
The device is in Standby mode (with a very low current consumption) if the voltage at the
MODE pin is greater than V
CC
−
0.5 V, or if this pin is floating. At a MODE voltage in the
range between 1.5 V and V
CC
−
1.5 V the amplifier is in a mute condition. The mute
condition is useful to suppress plop noise at the output, caused by charging of the input
capacitor.
SA58631_2
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 — 12 October 2007
4 of 21
NXP Semiconductors
SA58631
3 W BTL audio amplifier
9. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter
V
CC
V
I
I
ORM
T
stg
T
amb
V
P(sc)
P
tot
[1]
Conditions
operating
Min
−0.3
−0.3
-
Max
+18
V
CC
+ 0.3
1
+150
+85
10
2.3
Unit
V
V
A
°C
°C
V
W
supply voltage
input voltage
repetitive peak output current
storage temperature
ambient temperature
short-circuit supply voltage
total power dissipation
AC and DC short-circuit safe voltage.
non-operating
operating
[1]
−55
−40
-
-
HVSON8
10. Thermal characteristics
Table 5.
Symbol
R
th(j-a)
Thermal characteristics
Parameter
thermal resistance from junction to
ambient
Conditions
free air
9.7 cm
2
(1.5 in
2
)
heat spreader
32 cm
2
(5 in
2
)
heat spreader
R
th(j-sp)
[1]
[1]
Typ
80
32
28
5
Unit
K/W
K/W
K/W
K/W
[1]
thermal resistance from junction to
solder point
Thermal resistance is 28 K/W with DAP soldered to 32 cm
2
(5 in
2
), 35
µm
copper (1 ounce copper) heat
spreader.
SA58631_2
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 — 12 October 2007
5 of 21
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