SA58632
2
×
2.2 W BTL audio amplifier
Rev. 02 — 4 March 2010
Product data sheet
1. General description
The SA58632 is a two-channel audio amplifier in an HVQFN20 package. It provides
power output of 2.2 W per channel with an 8
Ω
load at 9 V supply. The internal circuit is
comprised of two BTL (Bridge-Tied Load) amplifiers with a complementary PNP-NPN
output stage and standby/mute logic. The SA58632 is housed in a 20-pin HVQFN
package, which has an exposed die attach paddle enabling reduced thermal resistance
and increased power dissipation.
2. Features
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
Professional and amateur mobile radio
Portable consumer products: toys and games
Personal computer remote speakers
NXP Semiconductors
SA58632
2
×
2.2 W BTL audio amplifier
4. Quick reference data
Table 1.
Quick reference data
V
CC
= 6 V; T
amb
= 25
°
C; R
L
= 8
Ω
; 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
power supply rejection ratio
P
o
= 0.5 W
[2]
[3]
[1]
Min
2.2
-
-
1.2
0.9
-
-
50
40
Typ
9
15
-
1.5
1.1
2.2
0.15
-
-
Max
18
22
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.
Ordering information
Name
SA58632BS
HVQFN20
Description
plastic thermal enhanced very thin quad flat package;
no leads; 20 terminals; body 6
×
5
×
0.85 mm
Version
SOT910-1
Type number Package
SA58632_2
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 4 March 2010
2 of 28
NXP Semiconductors
SA58632
2
×
2.2 W BTL audio amplifier
6. Block diagram
V
CCL
V
CCR
SA58632
INL−
INL+
15
14
R
17
10
16
OUTL−
V
CCL
R
20 kΩ
1
OUTL+
20 kΩ
STANDBY/MUTE LOGIC
INR−
INR+
12
13
R
11
OUTR−
V
CCR
R
20 kΩ
6
OUTR+
SVR
3
20 kΩ
MODE
BTL/SE
2
4
STANDBY/MUTE LOGIC
5
n.c.
8
9
19
18
20
7
GND GND GND GND LGND RGND
002aac078
Fig 1.
Block diagram of SA58632
SA58632_2
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 4 March 2010
3 of 28
NXP Semiconductors
SA58632
2
×
2.2 W BTL audio amplifier
7. Pinning information
7.1 Pinning
20 LGND
17 V
CCL
16 OUTL−
15 INL−
14 INL+
13 INR+
12 INR−
11 OUTR−
V
CCR
10
7
8
GND
9
GND
002aac079
19 GND
terminal 1
index area
OUTL+
MODE
SVR
BTL/SE
n.c.
OUTR+
1
2
3
4
5
6
SA58632BS
Transparent top view
Fig 2.
Pin configuration for HVQFN20
7.2 Pin description
Table 3.
Symbol
OUTL+
MODE
SVR
BTL/SE
n.c.
OUTR+
RGND
GND
V
CCR
OUTR−
INR−
INR+
INL+
INL−
OUTL−
V
CCL
LGND
[1]
Pin description
Pin
1
2
3
4
5
6
7
8, 9, 18, 19
10
11
12
13
14
15
16
17
20
Description
positive loudspeaker terminal, left channel
operating mode select (standby, mute, operating)
half supply voltage, decoupling ripple rejection
BTL loudspeaker or SE headphone operation
not connected
positive loudspeaker terminal, right channel
ground, right channel
ground
[1]
supply voltage; right channel
negative loudspeaker terminal, right channel
negative input, right channel
positive input, right channel
positive input, left channel
negative input, left channel
negative output terminal, left channel
supply voltage, left channel
ground, left channel
Pins 8, 9, 18 and 19 are connected to the lead frame and also to the substrate. They may be kept floating.
When connected to the ground plane, the PCB can be used as heatsink.
SA58632_2
RGND
18 GND
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 4 March 2010
4 of 28
NXP Semiconductors
SA58632
2
×
2.2 W BTL audio amplifier
8. Functional description
The SA58632 is a two-channel BTL audio amplifier capable of delivering 2
×
1.5 W output
power to an 8
Ω
load at THD+N = 10 % using a 6 V power supply. It is also capable of
delivering 2
×
2.2 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 6 V and an 8
Ω
loudspeaker, an output power of 1.5 W can be delivered to the load, and with a 9 V supply
voltage and an 8
Ω
loudspeaker an output power of 2.2 W can be delivered.
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. The device is in Active mode if the MODE pin is grounded or less than 0.5 V
(see
Figure 6).
8.3 BTL/SE output configuration
To invoke the BTL configuration (see
Figure 3),
the BTL/SE pin is taken to logic HIGH or
not connected. The output differentially drives the speakers, so there is no need for
coupling capacitors. The headphone can be connected to the amplifier negative outputs
using a coupling capacitor for each channel. The headphone common ground is
connected to the amplifier ground.
To invoke the Single-Ended (SE) configuration (see
Figure 15),
the BTL/SE pin is taken to
logic LOW or connected to ground. The positive outputs are muted with a DC level of
0.5V
CC
. Using a coupling capacitor for each channel, speakers can be connected to the
amplifier negative outputs. The speaker common ground is connected to the amplifier
ground. Headphones can be connected to the negative outputs without using output
coupling capacitors. The headphone common ground pin is connected to one of the
amplifier positive output pins.
SA58632_2
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 4 March 2010
5 of 28
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