DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
Description
Features
The AAT5101 is a high efficiency, 2.5W mono class D
audio power amplifier. The low noise, filterless PWM
architecture eliminates the output filter, reduces the
external component count and system cost, and simplifies system design. With high efficiency of up to 92% and
the industry lowest 1.35mA quiescent current, it increases battery lifetime and dramatically lowers the junction
temperature. The space saving wafer-level chip scale
package (WLCSP) and minimum external component
requirements make it ideal for cellular phones and
PDAs.
• Maximum Battery Life and Minimum Heat
▪ 1.35mA Quiescent Current
▪ 0.06μA Shutdown Current
▪ Up to 92% Efficiency
• Large Output Power Capabilities
▪ 1.35W with 8Ω Load and THD+N < 1%
▪ 2.5W with 4Ω Load and THD+N < 10%
• Pop and Click Noise Suppression Circuitry
• Thermal and Output Short Circuit Protection with Selfrecovery
• High Performance, THD+N of 0.12% at 5V, 8Ω Load
and POUT = 1.0W
• Filter-less Capability
• Internally Generated 250 kHz Switching Frequency
• Excellent PSRR and Wide Supply Voltage Range (2.1V
to 5.5V)
• Fully Differential Design
• External Gain Configuration Capability
• 9-Pin Wafer-Level Chip Scale Packaging (WLCSP)
With high PSRR, low THD+N, and 91dB SNR, the
AAT5101 guarantees clean sound across the wide audio
output power range and the full audio frequency domain.
Short circuit and thermal protection with self-recovery
prevents the device from being damaged during over
current conditions.
In cellular phones, the earpiece, speaker phone and
melody ringer can each be driven by the AAT5101. Also,
proprietary technology successfully suppresses pop and
click noise.
Applications
•
•
•
•
•
Cellular Phones
MP4s
Notebook Computers
PDAs
Portable DVD Players
Typical Application
To Battery
CS
VDD
+
RI
IN -
VO +
-
Differential
input
PWM
H-Bridge
+
-
RI
RL
VO -
IN +
Shutdown Control
SHUTDOWN
GND
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1
DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
Pin Description
Pin #
Symbol
Type
A1
A2
A3
B1
B2
B3
C1
IN+
GND
VOVDD
PVDD
GND
IN-
I
I
O
I
I
I
I
C2
SHUTDOWN
C3
VO+
O
Description
Positive differential input.
Analog ground.
Negative BTL output.
Analog power supply.
Power supply for internal H-bridge stage.
Analog ground.
Negative differential input.
The device enters shutdown mode when a low level is applied on this pin. An internal
300kΩ will force the device into shutdown mode if no signal is applied to this pin. It also
helps to save space and cost.
Positive BTL output
Pin Configuration
.
2
WLCSP-9
(Top View)
IN+
GND
VO-
A1
A2
A3
VDD
PVDD
GND
B1
B2
B3
IN-
SHUTDOWN
VO+
C1
C2
C3
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DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
Absolute Maximum Ratings
Symbol
Description
Max
Active Mode
Shutdown Mode
VDD
Supply Voltage
IOUT
TA
TJ
Maximum Output Current
Operating Ambient Temperature
Maximum Junction Temperature
Latchup Current @ TA = 85°C
5.5
6.0
1.5
-40 to +85
165
> 200
Units
V
A
°C
mA
Recommended Operating Conditions
Symbol
Description
Min
Max
Units
PVDD, VDD
TA
Supply Voltage
Operating Temperature
2.1
-40
5.5
85
V
°C
Thermal Characteristics
Symbol
ΘJA
PD
Description
Maximum Thermal Resistance
Maximum Power Dissipation1,2
1
Value
Units
120
833
°C/W
mW
1. Mounted on a FR4 board.
2. Derate 6.25mW/°C above 25°C.
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3
DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
Electrical Characteristics
TA = 25°C unless otherwise noted.
Symbol
VDD
IQ
ISD
VSDIH
VSDIL
FSW
G
Characteristic
Conditions
Operating Supply Voltage
TA = -40°C to +85°C
VDD = 5.5V, No Load
VDD = 3.6V, No Load
VDD = 2.1V, No Load
VDD = 2.1V to 5.5V
VDD = 3.6V, TA = -40°C to 85°C
VDD = 3.6V, TA = -40°C to 85°C
VDD = 2.1V to 5.5V
RL = 4Ω
RL = 8Ω
VDD = 5.5V
VDD = 3.6V
VDD = 2.1V
Supply Quiescent Current
Shutdown Current
Shutdown Voltage High
Shutdown Voltage Low
Switching Frequency
Amplifier Gain
RDS
Static Drain-Source On-State
Resistance
RS
TON
TOFF
Resistance from Shutdown to GND
Turn On Time
Turn Off Time
Min
Typ
Max
Units
5.5
3.2
V
2.1
1.72
1.35
0.87
0.06
mA
2.5
1
μA
1.4
200
280kΩ/RI
300kΩ/RI
VDD = 2.1V to 5.5V
VDD = 2.1V to 5.5V
250
300kΩ/RI
320kΩ/RI
300
350
500
300
8
8
0.6
300
320kΩ/RI
340kΩ/RI
V
kHz
V/V
mΩ
KΩ
ms
Operating Characteristics
TA = 25°C, Gain = 2V/V, RI = 150kΩ unless otherwise noted.
Symbol
Characteristic
Conditions
Min
THD+N = 10%, f = 1kHz, RL = 4Ω
THD+N = 1%, f = 1kHz, RL = 4Ω
POUT
Output Power
THD+N = 10%, f = 1kHz, RL = 8Ω
THD+N = 1%, f = 1kHz, RL = 8Ω
RL = 8Ω, f = 1kHz
Efficiency
RL = 4Ω,f = 1kHz
THD+N
SNR
CMRR
PSRR
ZI
4
Total Harmonic
Distortion + Noise
RL = 8Ω, f = 1kHz
RL = 8Ω, f = 1kHz
RL = 8Ω, f = 1kHz
VDD = 5.0V, POUT = 1.0W, RL = 8Ω
Signal-to Noise Ratio
Common Mode
Rejection Ratio
Power Supply Ripple
Rejection
VDD = 3.6V, Inputs AC-ground with
CI = 2.2μF
Input Impedance
RL = 4Ω
VDD = 3.6V, VIC = 1Vpp
VDD
VDD
VDD
VDD
VDD
VDD
VDD
=
=
=
=
=
=
=
VDD = 5.0V
VDD = 3.6V
VDD = 2.5V
VDD = 5.0V
VDD = 3.6V
VDD = 2.5V
VDD = 5.0V
VDD = 3.6V
VDD = 2.5V
VDD = 5.0V
VDD = 3.6V
VDD = 2.5V
5.0V, POUT =
3.6V, POUT =
5.0V, POUT =
3.6V, POUT =
5.0V, POUT =
3.6V, POUT =
2.5V, POUT =
Typ
Max
2.80
1.41
0.62
2.35
1.14
0.46
1.66
0.84
0.37
1.35
0.68
0.29
92
91
87
85
0.12
0.21
0.26
91
1.2W
0.6W
2.0W
1.0W
1.0W
0.5W
0.2W
f = 217Hz
-63
VRIPPLE = 200mVpp,
f = 217Hz
-60
142
150
W
%
dB
158
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Units
kΩ
DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
Typical Characteristics1, 2
+
CI
RI
IN+
+
VO+
Load
Measurement
Output
30kHz Low Pass
Filter
AAT5101
-
CI
RI
IN-
VO-
VDD
Measurement
Input
-
GND
4.7μF
+
Power Supply
-
Test Set-up for Typical Characteristics Graphs.
1. A 33μH inductor was placed in series with load resistor to emulate a small speaker for efficiency measurement.
2. The 30kHz low-pass filter is required even if the analyzer has an internal low-pass filter. An RC low pass filter (100Ω, 47nF) is used on each output for the data sheet
graphs.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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5
DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
Typical Characteristics
Efficiency vs. Output Power
Efficiency vs. Output Power
(f = 1kHz; RL = 4Ω + 33μH)
100
90
90
80
80
70
Efficiency (%)
Efficiency (%)
(f = 1kHz; RL = 8Ω
Ω + 33μH)
70
60
50
40
VDD = 5.0V
VDD = 3.6V
VDD = 2.5V
VDD = 2.1V
30
20
10
60
50
40
30
VDD = 5.0V
VDD = 3.6V
VDD = 2.5V
VDD = 2.1V
20
10
0
0
0
0.3
0.6
0.9
1.2
1.5
0
0.5
Output Power (W)
Supply Current vs. Output Power
1.5
2.0
(f = 1kHz; RL = 4Ω
Ω + 33μH)
600
350
Supply Current (mA)
300
250
200
150
VDD = 5.0V
VDD = 3.6V
VDD = 2.5V
VDD = 2.1V
100
50
0
0
500
400
300
200
VDD = 5.0V
VDD = 3.6V
VDD = 2.5V
VDD = 2.1V
100
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Output Power (W)
0
0.5
1.0
1.5
2.0
Output Power (W)
Quiescent Current vs. Supply Voltage
Quiescent Current (mA)
2.5
2
1.5
1
85°C
25°C
-40°C
0.5
0
2.0
2.3
2.6
2.9
3.2
3.5
3.8
4.1
4.4
4.7
5.0
5.3
5.6
Supply Voltage (V)
6
2.5
Supply Current vs. Output Power
(f = 1kHz; RL = 8Ω
Ω + 33μH)
Supply Current (mA)
1.0
Output Power (W)
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2.5
DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
Typical Characteristics
THD+N vs. Output Power
THD+N vs. Output Power
(f = 1kHz; RL = 8Ω)
(f = 1kHz; RL = 4Ω)
10
VDD = 5.0V
VDD = 3.6V
VDD = 2.5V
VDD = 2.1V
THD+N (%)
THD+N (%)
10
1
0.1
0.01
0.1
1
VDD = 5.0V
VDD = 3.6V
VDD = 2.5V
VDD = 2.1V
1
0.1
0.01
10
0.1
Output Power (W)
THD+N vs. Frequency
(CI = 2.2μF; RL = 4Ω)
10
10
VDD = 5V, POUT = 1W
VDD = 3.6V, POUT = 500mW
VDD = 2.5V, POUT = 200mW
VDD = 2.1V, POUT = 150mW
1
THD+N (%)
THD+N (%)
10
THD+N vs. Frequency
(CI = 2.2μF; RL = 8Ω)
0.1
0.01
10
100
1000
10000
VDD = 5.0V, POUT = 1.5W
VDD = 3.6V, POUT = 800mW
VDD = 2.5V, POUT = 300mW
VDD = 2.1V, POUT = 200mW
1
0.1
0.01
10
100000
100
Frequency (Hz)
10000
100000
Output Power vs. Supply Voltage
(f = 1kHz; RL = 8Ω)
(f = 1kHz; RL = 4Ω)
3.0
1.5
2.5
Output Power (W)
1.8
1.2
0.9
0.6
THD+N = 1%
THD+N = 10%
0.3
1000
Frequency (Hz)
Output Power vs. Supply Voltage
Output Power (W)
1
Output Power (W)
2.0
1.5
1.0
0.5
THD+N = 1%
THD+N = 10%
0.0
0.0
2.0
2.5
3.0
3.5
4.0
Supply Voltage (V)
4.5
5.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Supply Voltage (V)
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7
DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
Typical Characteristics
PSRR vs. Frequency
(VRIPPLE = 200mVpp; CI = 2.2μF; RL = 4Ω; Inputs AC-grounded)
-40
-40
-45
-45
-50
-50
-55
-60
VDD = 5.0V
VDD = 3.6V
VDD = 2.5V
VDD = 2.1V
-65
-70
10
100
1000
10000
PSRR (dB)
PSRR (dB)
PSRR vs. Frequency
(VRIPPLE = 200mVpp; CI = 2.2μF; RL = 8Ω; Inputs AC-grounded)
-55
-60
VDD = 5.0V
VDD = 3.6V
VDD = 2.5V
VDD = 2.1V
-65
-70
10
100000
100
1000
Frequency (Hz)
10000
100000
Frequency (Hz)
CMRR vs. Frequency
Shutdown Voltage (High) vs. Supply Voltage
(VDD = 3.6V; VIC = 200mVpp; RL = 8Ω)
Shutdown Voltage (High) (V)
-40
CMRR (dB)
-45
-50
-55
-60
-65
-70
10
100
1000
10000
100000
Frequency (Hz)
1.6
1.4
1.2
1
0.8
0.6
0.4
85°C
25°C
-40°C
0.2
0
2.1
2.4
2.7
3.0
3.3
3.6
3.9
4.2
4.5 4.8
5.1
Supply Voltage (V)
Shutdown Voltage (Low) (V)
Shutdown Voltage (Low) vs. Supply Voltage
1.6
1.4
1.2
1
0.8
0.6
0.4
85°C
25°C
-40°C
0.2
0
2.1
2.4
2.7
3.0
3.3 3.6
3.9 4.2
4.5 4.8
5.1
5.4
5.7 6.0
Supply Voltage (V)
8
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5.4
5.7
6.0
DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
Application Information
Input Resistor (RI) Selection
The input resistors (RI) set the gain of the amplifier
according to the following equation:
Gain = 300KΩ (RL = 4Ω)
Gain = 320KΩ (RL = 8Ω)
For input resistors (RI), resistor matching is a very
important criteria. The balance of the output around the
reference voltage depends on a matched ratio of the
resistors. CMRR and PSRR diminish if resistor mismatch
occurs. Therefore, it is recommended to use 1% tolerance resistors or better to keep the performance optimized.
Decoupling Capacitor (CS) Selection
The AAT5101 is a high-performance class-D audio amplifier that requires adequate power supply decoupling to
ensure high efficiency and low total harmonic distortion
(THD). For decoupling capacitor (CS), a good low equivalent series resistance (ESR) 4.7μF ceramic capacitor is
preferred.
Input Capacitor (CI) Selection
The input capacitors and input resistors form a high-pass
filter with the corner frequency, FC, determined by the
following equation. The value of the input capacitor is an
important consideration as it directly affects the bass
(low frequency) performance of the circuit. Speakers in
wireless phones cannot usually respond well to low frequencies, so a high pass filter will be useful in this application.
FC =
1
2 · π · RI · CI
Optional Output Filter
The AAT5101 can be designed without an output filter if
the traces from the amplifier to the speaker are short.
However, to lower radiated emissions as much as possible when used in filter-free mode, a ferrite bead filter
can be used. If choosing a ferrite bead, choose one with
high impedance at high frequencies, but very low impedance at low frequencies. The MPZ1608S221A1 from TDK
is a good choice.
VO +
Ferrite Bead
Ferrite Bead
VO Figure 1: Optional EMI Ferrite Bead Filter.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201876B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
9
DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
To Battery
CS
VDD
RI
+
IN -
VO +
-
Differential
input
H-Bridge
PWM
+
RI
-
RL
VO -
IN +
Shutdown Control
GND
SHUTDOWN
Figure 2: AAT5101 Application Schematic with DC-Coupled Fully Differential Input Configuration.
To Battery
CS
VDD
CI
RI
IN VO+
-
Differential
input
CI
PWM
H-Bridge
+
RI
RL
VO -
IN +
Shutdown Control
SHUTDOWN
GND
Figure 3: AAT5101 Application Schematic with AC-Coupled Fully Differential Input Configuration.
10
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201876B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
To Battery
CS
VDD
CI
RI
IN -
VO +
Single -ended
input
H- Bridge
PWM
CI
+
RI
RL
VO -
IN +
Shutdown Control
GND
SHUTDOWN
Figure 4: AAT5101 Application Schematic with Single-Ended Input Configuration.
To Battery
CS
+
Differential
input 1
-
RI1
RI1
RI2
VDD
IN -
VO+
+
-
Differential
input 2
PWM
H-Bridge
+
-
RI2
RL
VO-
IN +
Shutdown Control
SHUTDOWN
GND
Figure 5: AAT5101 Application Schematic with AAT5101 Summing Two Differential Inputs.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201876B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012
11
DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
To Battery
CS
RI1
Differential
input 1
RI1
CI2
RI2
VDD
IN -
VO+
Single-ended
input 2
H-Bridge
PWM
+
CI2
RI2
RL
VO-
IN +
Shutdown Control
GND
SHUTDOWN
Figure 6: AAT5101 Application Schematic with AAT5101 Summing
Differential Input and Single-Ended Input Signals.
To Battery
CS
CI1
RI1
VDD
Single-ended
Input 1
CI2
RI2
IN VO+
Single-ended
Input 2
PWM
H- Bridge
RL
+
CP
RP
VO-
IN +
Shutdown Control
SHUTDOWN
GND
Figure 7: AAT5101 Application Schematic with AAT5101 Summing Two Single-Ended Inputs.
12
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
PCB Guidance
3.
The suggested PCB layout for the AAT5101 is shown in
Figure 9. All components are placed as close as possible
to the AAT5101's leads to achieve better performance.
4.
The following guidelines should be used to help ensure a
proper layout.
WLCSP Package Light Sensitivity
1.
2.
The input routes should be similar and the distance
between the two routes should be small.
The output traces should be short, wide, and not
pass beneath the IC in the other layers.
The electrical performance of the WLCSP package can be
adversely affected by exposing the device to certain light
sources, such as direct sunlight or a halogen lamp whose
wavelengths are red and infra-reds. However, fluorescent lighting has very little effect on the electrical performance of the WLCSP package.
The decoupling capacitor (C4) should connect to the
VDD pin and PVDD pin as closely as possible.
The input resistor (R1, R2) should be placed very
close to the AAT5101.
Evaluation Board Information
VDD
C3
C4
4.7μF
GND
U1
GND PVDD VDD
IN+
VO -
GND
In+
GND
C1
0.1μF
R1
150kΩ
C2
0.1μF
R2
150kΩ
1
2
InAudio In
J4
VO+
IN-
OutOut+
Audio Out
SD
AAT5101
J1
VDD
1
2
3
Shutdown
Figure 8: AAT5101 Evaluation Board Schematic.
Component Selection
Item
1
2
3
4
Part Description
SMD Resistor 150KΩ
Ceramic Capacitor 0.1μF, 50V, X7R
Ceramic Capacitor 4.7μF, 6.3V, X5R
Not populated
Ref
PCB Footprint
Manufacturer
Part Number
R1, R2
C1, C2
C4
C3
0603
0603
0603
Vishay-Draloric
TDK
TDK
CRCW0603
C1608X7R1H104KT
C1608X5R0J475MT
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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13
DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
(a) Top Layer
(b) Ground Plane
(c) Power Plane
(d) Bottom Layer
Figure 9: AAT5101 Evaluation Board PCB Layout.
14
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT5101
2.5W Mono Filter-Free Class D Audio Power Amplifier
Ordering Information
Package
Part Marking1
Part Number (Tape and Reel)2
WLCSP-9
7HYW
AAT5101IUR-T1
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Packaging Information
WLCSP-9
0.500 BSC
1.000
Top View
Bottom View
0.650 ± 0.060
0.320 ± 0.020
1.000
1.420 ± 0.025
1.420 ± 0.025
0.235 ± 0.020
0.415 ± 0.040
1.420 ± 0.025
Side View
All dimensions in millimeters.
1. YW = date code.
2. Sample stock is generally held on part numbers listed in BOLD.
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