Copyright ANPEC Electronics Corp.
Rev. A.5 - July., 2002
APA2020A
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
Features
Low Supply Current , I
DD
= 8mA at Stereo BTL
Low Shutdown Current , I
DD
= 0.5A
Depop Circuitry Integrated
Low Supply Voltage
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
High Supply Voltage Ripple Rejection
Applications
General Description
Ordering Information
APA2020A
Handling Code
Temp. Range
Package Code
Package Code
K : SOP
R : TSSOP-P *
Temp. Range
I: - 40 to 85 C
Handling Code
TU : Tube TR : Tape & Reel
TY : Tray
* TSSOP-P is a standard TSSOP package with a thermal pad exposure on the bottom of the package.
The APA2020A is a stereo bridge-tied audio power
amplifier in various 24-pin power packages , includ-
ing SOP , TSSOP-P. When connecting to a 5V volt-
age supply , the APA2020A 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 APA2020A simplifies design and
frees up board space for other features .
Stereo Audio Power Amplifier for Notebook
Computer
The APA2020A 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 APA2020A , 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 APA2020A 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 APA2020A also
features a shutdown function which keeps the supply
current only 0.5 A (typ) .
Copyright ANPEC Electronics Corp.
Rev. A.5 - July., 2002
APA2020A
www.anpec.com.tw
2
Block Diagram
MUX
MUX
MUX
SE/BTL
(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.5 - July., 2002
APA2020A
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)
APA2020A
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
Electrical Characteristics (Cont.)
Copyright ANPEC Electronics Corp.
Rev. A.5 - July., 2002
APA2020A
www.anpec.com.tw
4
Electrical Characteristics (Cont.)
AC Operating Characteristics , V
DD
= 5V , T
A
= 25C , R
L
= 4
(unless otherwise noted)
APA2020A
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
M
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.
APA2020A
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
AC Operating Characteristics , V
DD
= 3.3V , T
A
= 25C , R
L
= 4
(unless otherwise noted)
Copyright ANPEC Electronics Corp.
Rev. A.5 - July., 2002
APA2020A
www.anpec.com.tw
5
Electrical Characteristics (Cont.)
AC Operating Characteristics , V
DD
= 3.3V , T
A
= 25C , R
L
= 4
(unless otherwise noted)
APA2020A
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
M
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.
A
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