Copyright
ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002
APA2020
www.anpec.com.tw
1
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Stereo 2-W Audio Power Amplifier
The APA2020 also served well in low-voltage
applications , which provides 800-mW per channel
into 4
loads with a 3.3V supply voltage. Both of the
depop circuitry and the thermal shutdown protection
circuitry are integrated in the APA2020 , that reduces
pops and clicks noise during power up and when
using the shutdown or mute modes and protects the
chip from being destroyed by over-temperature
failure.
To simplify the audio system design in notebook
computer applications , the APA2020 combines a
stereo bridge-tied loads (BTL) mode for speaker drive
and a stereo single-end (SE) mode for headphone
drive into a single chip , where both modes are easily
switched by the SE/BTL input control pin signal. For
power sensitive applications , the APA2020 also
features a shutdown function which keeps the supply
current only 0.5 A (typ).
Features
Depop Circuitry Integrated
Thermal Shutdown Circuitry Integrated
Output Power at 1% THD+N, V
DD
=5V
- 1.8 W/Ch (typ) into a 4
Load
- 1.2 W/Ch (typ) into a 8
Load
Bridge-Tied Load (BTL) or Single-Ended
(SE) Modes Operation
Various 24-Pin Power Packages Available
SOP, TSSOP-P
Shutdown Control Mode , I
DD
= 0.5A
Applications
Stereo Audio Power Amplifier for Notebook
Computer
General Description
Ordering and Marking Information
A P A 2 0 2 0
H a n d lin g C o d e
T e m p . R a n g e
P a c k a g e C o d e
P a c k a g e C o d e
K : S O P
R : T S S O P - P *
T e m p . R a n g e
I : - 4 0 to 8 5 C
H a n d lin g C o d e
T U : T u b e T R : T a p e & R e e l
T Y : T r a y
L e a d F r e e C o d e
L : L e a d F r e e D e v ic e B la n k : O r ig in a l D e v ic e
A P A 2 0 2 0 K :
A P A 2 0 2 0
X X X X X
X X X X X - D a t e C o d e
A P A 2 0 2 0 R :
A P A 2 0 2 0
X X X X X
X X X X X - D a t e C o d e
L e a d F r e e C o d e
* TSSOP-P is a standard TSSOP package with a thermal pad exposure on the bottom of the package.
The APA2020 is a stereo bridge-tied audio power am-
plifier in various 24-pin power packages , including
SOP , TSSOP-P. When connecting to a 5V voltage
supply , the APA2020 is capable of delivering 1.8W/
1.2W of continuous RMS power per channel into 4
/
8
loads with less than 1% THD+N , respectively.
The APA2020 simplifies design and frees up board
space for other features.
Copyright
ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002
APA2020
www.anpec.com.tw
2
Block Diagram
M U X
M U X
M U X
S E / B T L
(Over operating free-air temperature range unless otherwise noted.)
Symbol
Parameter
Rating
Unit
V
CC
Supply Voltage
6
V
T
A
Operating Ambient Temperature Range
-40 to 85
C
T
J
Maximum Junction Temperature
150
C
T
STG
Storage Temperature Range
-65 to +150
C
T
S
Soldering Temperature,10 seconds
300
C
V
ESD
Electrostatic Discharge
-3000 to 3000
*1
-200 to 200
*2
V
Absolute Maximum Ratings
Note: 1. Human body model : C=100pF , R=1500
, 3 positive pulses plus 3 negative pulses
2. Machine model : C=200pF , L=0.5mH , R=0
, 3 positive pulses plus 3 negative pulses
Copyright
ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002
APA2020
www.anpec.com.tw
3
Recommended Operating Conditions
Min.
Typ.
Max.
Unit
Supply Voltage, V
DD
3
5
5.5
V
V
DD
=5V, 4-
stereo BTL drive,
250mW/Ch average power, with proper PCB
design
-20
85
Operating free-air
temperature, T
A
V
DD
=5V, 3-
stereo BTL drive,
2 W/Ch average power, with proper PCB design
and 300 CFM
forced-air cooling
-20
85
C
V
DD
=5 V
1.25
4.5
Common mode
input voltage, V
ICM
V
DD
=3.3V
1.25
2.7
V
AC Operating Characteristics , V
DD
= 5V , T
A
= 25C , R
L
= 4
(unless otherwise noted)
APA2020
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
THD = 10% , BTL , R
L
=4
R
L
=8
2.3
1.5
THD = 1% , BTL , R
L
=4
R
L
=8
1.8
1.2
W
THD = 10% , SE , R
L
=4
R
L
=8
650
400
P(out)
Output power (each channel )
see Note 1
THD = 1% , SE , R
L
=4
R
L
=8
THD = 0.5% , SE , R
L
=32
500
320
90
mW
P
O
= 1.6W , BTL , R
L
=4
P
O
= 1W , BTL , R
L
=8
P
O
= 78mW , SE ,R
L
=32
300
150
20
THD + N Total harmonic distortion plus
noise
V
1
= 1V , R
L
=4
,
G = 1
10
m%
B
OM
Maximum output power
bandwidth
G = 10 , THD < 1%
>20
KHz
R
L
= 4
, BTL
72
R
L
= 4
, Open Load
71
Phase margin
R
L
= 4
, SE
52
Notes 1 : Output power is meaured at the output teminals of the IC at 1 KHz.
Electrical Characteristics (Cont.)
Copyright
ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002
APA2020
www.anpec.com.tw
4
Electrical Characteristics (Cont.)
AC Operating Characteristics , V
DD
= 5V , T
A
= 25C , R
L
= 4
(unless otherwise noted)
APA2020
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
PSRR
Power supply ripple rejection
f =100 Hz
80
dB
Mute attenuation
85
dB
Channel-to-channel output
separation
85
dB
Line HP input separation
75
dB
BTL attenuation in SE mode
80
dB
ZI
Input impedance
2
MW
Signal-to-noise ratio
Po = 500 mW , BTL
90
dB
Vn
Output noise voltage
80
V(
rms)
Notes 1 : Output power is meaured at the output teminals of the IC at 1 KHz.
Electrical Characteristics (Cont.)
APA2020
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
THD = 10% , BTL , R
L
=4
R
L
=8
1
0.6
THD = 1% , BTL , R
L
=4
R
L
=8
0.8
0.5
W
THD = 10% , SE , R
L
=4
R
L
=8
290
180
P(out)
Output power (each channel )
see Note 2
THD = 1% , SE , R
L
=4
R
L
=8
THD = 0.5% , SE , R
L
=32
230
140
43
mW
P
O
= 1.6W , BTL , R
L
=4
P
O
= 1W , BTL , R
L
=8
P
O
= 78mW , SE ,R
L
=32
270
150
20
THD
+
N Total harmonic distortion plus
noise
V
1
= 1V , R
L
=4
,
G = 1
10
m%
B
OM
Maximum output power
bandwidth
G = 10 , THD < 1%
>20
KHz
R
L
= 4
, BTL
92
R
L
= 4
, Open Load
70
Phase margin
R
L
= 4
, SE
57
Notes 2 : Output power is meaured at the output teminals of the IC at 1 KHz.
AC Operating Characteristics , V
DD
= 3.3V , T
A
= 25C , R
L
= 4
(unless otherwise noted)
Copyright
ANPEC Electronics Corp.
Rev. A.8 - Nov., 2002
APA2020
www.anpec.com.tw
5
Electrical Characteristics (Cont.)
AC Operating Characteristics , V
DD
= 3.3V , T
A
= 25C , R
L
= 4
(unless otherwise noted)
APA2020
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
PSRR
Power supply ripple rejection
f =100 Hz
70
dB
Mute attenuation
85
dB
Channel-to-channel output
separation
f =1 KHz
85
dB
Line HP input separation
75
dB
BTL attenuation in SE mode
80
dB
ZI
Input impedance
2
MW
Signal-to-noise ratio
Po = 500 mW , BTL
90
dB
Vn
Output noise voltage
50
V(
rms)
Notes 2 : Output power is meaured at the output teminals of the IC at 1 KHz.
DC Electrical Characteristic , T
A
=25 C
APA2020
Symbol
Parameter
Test Conditions
Typ.
Max.
Unit
Stereo BTL
8
11
mA
V
DD
= 5V
Stereo SE
4
6.5
mA
Stereo BTL
7
9
mA
I
DD
Supply Current
V
DD
= 3.3 V
Stereo SE
3.5
5.6
mA
V
O (DIFF)
DC Differential Output
Voltage
V
DD
=5V, Gain = 2, see Note3
5
25
mV
I
DD(MUTE)
Supply Current in Mute Mode V
DD
= 5V
8
11
mA
I
SD
I
DD
in Shutdown
V
DD
= 5V
0.5
5
A
Note 3 : at 3V<V
DD
<5V , the DC output voltage is approximately V
DD
/ 2.
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