APA2020A
Stereo 2-W Audio Power Amplifier
Features
•
•
•
•
•
•
Low Supply Current , I
DD
= 8mA at Stereo BTL
Low Shutdown Current , I
DD
= 0.5µA
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
Ω
Load
- 1.2 W/Ch (typ) into a 8
Ω
Load
General Description
The APA2020A 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 APA2020A is capable of delivering 1.8W/1.2W of
continuous RMS power per channel into 4Ω/8Ω loads
with less than 1% THD+N, respectively. The APA2020A
simplifies design and frees up board space for other
features.
The APA2020A also served well in low-voltage
applications, which provides 800-mW per channel into
4Ω 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 µA (typ).
•
•
•
•
Bridge-Tied Load (BTL) or Single-Ended
(SE) Modes Operation
Various 24-Pin Power Packages Available
SOP , TSSOP-P
High Supply Voltage Ripple Rejection
Lead Free Available (RoHS Compliant)
Applications
•
Stereo Audio Power Amplifier for Notebook
Computer
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.
Copyright
©
ANPEC Electronics Corp.
Rev. A.7 - Jun., 2005
1
www.anpec.com.tw
APA2020A
Ordering and Marking Information
APA2020A
Package Code
K : SOP
R : TSSOP-P *
Lead Free Code T e m p . R a n g e
I : - 40 to 85 ° C
Handling Code
Handling Code
TU : Tube
TR : Tape & Reel
Temp. Range
TY : Tray
Package Code
Lead Free Code
L : Lead Free Device Blank : Original Device
APA2020A
XXXXX - Date Code
XXXXX
APA2020A
XXXXX
XXXXX - Date Code
APA2020A K :
APA2020A R :
* TSSOP-P is a standard TSSOP package with a thermal pad exposure on the bottom of the package.
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termina-
tion finish; which are fully compliant with RoHS and compatible with both SnPb and lead-free soldiering operations.
ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J STD-020C for MSL classificaion
at lead-free peak reflow temperature.
Block Diagram
MUX
MUX
MUX
SE/BTL
Absolute Maximum Ratings
(Over operating free-air temperature range unless otherwise noted.)
Symbol
V
CC
T
A
T
J
T
STG
T
S
V
ESD
Supply Voltage
Parameter
Rating
6
-40 to 85
150
-65 to +150
300
-3000 to 3000
*1
-200 to 200
*2
Unit
V
°C
°C
°C
°C
V
Operating Ambient Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Soldering Temperature,10 seconds
Electrostatic Discharge
Note: 1. Human body model : C=100pF , R=1500Ω , 3 positive pulses plus 3 negative pulses
2. Machine model : C=200pF , L=0.5mH , R=0Ω , 3 positive pulses plus 3 negative pulses
Copyright
©
ANPEC Electronics Corp.
Rev. A.7 - Jun., 2005
2
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APA2020A
Recommended Operating Conditions
Min.
Supply Voltage, V
DD
V
DD
=5V,
4-Ω stereo BTL drive,
Operating free-air 250mW/Ch average power, with proper PCB
temperature, T
A
design
V
DD
=5V,
2 W/Ch average power,
3-Ω stereo BTL drive,
with proper PCB design
and 300 CFM
forced-air cooling
3
-20
Typ.
5
Max.
5.5
85
Unit
V
°C
-20
85
V
DD
=5 V
Common mode
input voltage, V
ICM
V
DD
=3.3V
1.25
1.25
4.5
2.7
V
Electrical Characteristics
AC Operating Characteristics , V
DD
= 5V , T
A
= 25°C , R
L
= 4Ω (unless otherwise noted)
Symbol
P (out)
Parameter
Output power (each channel)
see Note 1
Test Condition
THD = 10%, BTL, R
L
=4
Ω
R
L
=8
Ω
THD = 1%, BTL, R
L
=4Ω
R
L
=8
Ω
THD = 10%, SE, R
L
=4Ω
R
L
=8
Ω
THD = 1%, SE, R
L
=4
Ω
R
L
=8Ω
THD = 0.5%, SE, R
L
=32
Ω
THD + N Total harmonic distortion plus P
O
= 1.6W, BTL, R
L
=4
Ω
noise
P
O
= 1W, BTL, R
L
=8
Ω
P
O
= 78mW, SE, R
L
=32
Ω
V
1
= 1V, R
L
=4
Ω,
G = 1
B
OM
Maximum output power
bandwidth
Phase margin
G = 10, THD < 1%
R
L
= 4
Ω
, BTL
R
L
= 4
Ω
, Open Load
R
L
= 4Ω, SE
PSRR
Power supply ripple rejection
Mute attenuation
Channel-to-channel output
separation
Line HP input separation
BTL attenuation in SE mode
Copyright
©
ANPEC Electronics Corp.
Rev. A.7 - Jun., 2005
3
APA2020A
Min. Typ
.
Max.
2.3
1.5
1.8
1.2
650
400
500
320
90
300
150
20
10
>20
72
71
52
80
85
85
75
80
Unit
W
mW
m%
KHz
°
dB
dB
dB
dB
dB
f =100 Hz
www.anpec.com.tw
APA2020A
Electrical Characteristics (Cont.)
AC Operating Characteristics , V
DD
= 5V , T
A
= 25°C , R
L
= 4Ω (unless otherwise noted)
Symbol
ZI
Parameter
Input impedance
Signal-to-noise ratio
Po = 500 mW , BTL
Test Condition
APA2020A
Min. Typ
.
Max.
2
90
80
Unit
MΩ
dB
µV(rms)
Vn
Output noise voltage
Notes 1: Output power is meaured at the output teminals of the IC at 1 KHz.
AC Operating Characteristics , V
DD
= 3.3V , T
A
= 25°C , R
L
= 4Ω (unless otherwise noted)
Symbol
P (out)
Parameter
Output power (each channel)
see Note 2
Test Condition
THD = 10%, BTL, R
L
=4Ω
R
L
=8Ω
THD = 1%, BTL, R
L
=4Ω
R
L
=8Ω
THD = 10%, SE, R
L
=4Ω
R
L
=8Ω
THD = 1%, SE, R
L
=4Ω
R
L
=8Ω
THD = 0.5%, SE, R
L
=32
Ω
THD + N Total harmonic distortion plus P
O
= 1.6W, BTL, R
L
=4Ω
noise
P
O
= 1W, BTL, R
L
=8Ω
P
O
= 78mW, SE, R
L
=32Ω
V
1
= 1V, R
L
=4Ω
,
G = 1
B
OM
Maximum output power
bandwidth
Phase margin
G = 10, THD < 1%
R
L
= 4Ω, BTL
R
L
= 4Ω, Open Load
R
L
= 4Ω, SE
PSRR
Power supply ripple rejection
Mute attenuation
Channel-to-channel output
separation
Line HP input separation
BTL attenuation in SE mode
ZI
Input impedance
Signal-to-noise ratio
Po = 500 mW, BTL
f =1 KHz
f =100 Hz
APA2020A
Min. Typ. Max.
1
0.6
0.8
0.5
290
180
230
140
43
270
150
20
10
>20
92
70
57
70
85
85
75
80
2
90
50
dB
dB
dB
dB
dB
MΩ
dB
µV(rms)
°
mW
W
Unit
m%
KHz
Vn
Output noise voltage
Notes 2: Output power is measured at the output terminals of the IC at 1 KHz.
Copyright
©
ANPEC Electronics Corp.
Rev. A.7 - Jun., 2005
4
www.anpec.com.tw
APA2020A
Electrical Characteristics (Cont.)
DC Electrical Characteristic , T
A
=25℃
Symbol
Parameter
Test Condition
V
DD
= 5V
I
DD
Supply Current
V
DD
= 3.3V
Stereo BTL
Stereo SE
Stereo BTL
Stereo SE
V
O (DIFF)
DC Differential Output
Voltage
I
SD
V
IH
V
IL
I
DD
in Shutdown
High level threshold Voltage
Low level threshold Voltage
V
DD
= 5V, Gain = 2, see Note3
APA2020A
Min. Typ
.
Max.
8
4
7
3.5
5
8
0.5
2
4
0.8
3
11
6.5
9
5.6
25
11
5
Unit
mA
mA
mA
mA
mV
mA
µA
V
V
V
V
I
DD (MUTE)
Supply Current in Mute Mode V
DD
= 5V
V
DD
= 5V
SHUTDOWN, MUTEIN
SE/BTL, HP/LINE
SHUTDOWN, MUTEIN
SE/BTL, HP/LINE
Note 3: at 3V<VDD<5V, the DC output voltage is approximately VDD / 2.
Pin Description
GND/HS
T
J
LOUT+
LLINEIN
LHPIN
LBYPASS
LV
DD
SHUTDOWN
MUTE OUT
LOUT-
MUTE IN
GND/HS
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
GND/HS
NC
ROUT+
RLINEIN
RHPIN
RBYPASS
RV
DD
NC
HP/LINE
ROUT-
SE/BTL
GND/HS
Thermal
Pad
Top View
For SOP and TSSOP-P
Bottom View
For TSSOP-P Only
Pin
Name
GND/HS
TJ
No
1,12,
13,24
2
I/O
Description
Ground connection for circuitry, directly connected to thermal pad (only in
TSSOP-P package).
Shutdown mode control signal input, sources a current proportional to the
junction temperature. This pin should be left unconnected during normal
operation. For more information, see the junction temperature
measurement section of this document.
Left channel + output in BTL mode, + output in SE mode.
5
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O
LOUT +
3
O
Copyright
©
ANPEC Electronics Corp.
Rev. A.7 - Jun., 2005
