19-3589; Rev 2; 7/08
KIT
ATION
EVALU
BLE
AVAILA
2.8W, Low-EMI, Stereo, Filterless
Class D Audio Amplifier
General Description
Features
♦
5V Single-Supply Operation
♦
Spread-Spectrum Modulator Reduces EMI
♦
2.8W, Class D, Stereo Speaker Amplifier (4Ω)
♦
Filterless Class D Requires No LC Output Filter
♦
High PSRR (71dB at 1kHz)
♦
86% Efficiency (R
L
= 8Ω, P
OUT
= 1W)
♦
Low-Power Shutdown Mode
♦
Integrated Click-and-Pop Suppression
♦
Low Total Harmonic Distortion: 0.06% at 1kHz
♦
Short-Circuit and Thermal Protection
♦
Internal Gain, +9.0dB or +10.5dB
♦
Available in Space-Saving Package
16-Pin Thin QFN-EP (5mm x 5mm x 0.8mm)
MAX9715
The MAX9715 high-efficiency, stereo, Class D audio
power amplifier provides up to 2.8W per channel into a
4Ω speaker with a 5V supply. Maxim’s second-generation
Class D technology features robust output protection,
high efficiency, and high power-supply rejection (PSRR)
while eliminating the need for output filters. Selectable
gain settings, +10.5dB or +9.0dB, adjust the amplifier
gain to suit the audio input level and speaker load.
The MAX9715 features high PSRR (71dB at 1kHz),
allowing for operation from noisy supplies without addi-
tional regulation. Comprehensive click-and-pop sup-
pression eliminates audible clicks and pops at startup
and shutdown. The MAX9715 operates from a single 5V
supply and consumes only 12mA of supply current.
Integrated shutdown control reduces supply current to
less than 100nA.
The MAX9715 is fully specified over the extended
-40°C to +85°C temperature range and is available in a
thermally enhanced 16-pin TQFN-EP package.
Applications
High-End Notebook Audio
LCD Projectors
Portable Audio
Multimedia Docking Stations
Typical Operating Circuit/Functional Diagram appears at
end of data sheet.
PART
MAX9715ETE+
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
16 TQFN-EP*
+Denotes
a lead-free/RoHS-compliant package.
*EP
= Exposed pad.
Block Diagram
PGND
Pin Configurations
OUTR+
OUTR-
10
TOP VIEW
4.5V TO 5.5V SUPPLY
12
BIAS 13
V
DD
14
11
PV
DD
9
8
7
OUTR+
INR
OUTR-
GAIN
CLASS D
AMPLIFIER
OUTL+
INL
OUTL-
SHDN
GND
GAIN
N.C.
MAX9715
INR 15
INL 16
+
1
PGND
2
OUTL+
3
OUTL-
4
PV
DD
6
5
MAX9715
TQFN
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
2.8W, Low-EMI, Stereo, Filterless Class D
Audio Amplifier
MAX9715
ABSOLUTE MAXIMUM RATINGS
V
DD
, PV
DD
, to GND ...............................................................+6V
GND to PGND .......................................................-0.3V to +0.3V
Any Other Pin to PGND ............................. -0.3V to (V
DD
+ 0.3V)
Duration of OUT__ Short Circuit to PGND or PV
DD
....Continuous
Duration of OUT_+ Short Circuit between OUT_- ......Continuous
Continuous Current Into/Out of (PV
DD
, OUT__, PGND)........1.7A
Continuous Input Current (All Other Pins) ....................... ±20mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin TQFN-EP (derate 20.8mW/°C above +70°C)..1666mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
DD
= PV
DD
= 5.0V, GND = PGND = 0V, V
SHDN
= V
DD
, C
BIAS
= 1μF, speaker impedance = 8Ω in series with 68μH connected between
OUT_+ and OUT_-, GAIN = +10.5dB, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
GENERAL
Supply Voltage Range
Quiescent Current
Shutdown Supply Current
Input Resistance
Turn-On Time
BIAS Voltage
CLASS D SPEAKER AMPLIFIERS
Output Offset Voltage
Maximum Speaker Amplifier Gain
(Note 3)
V
OS
A
V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
GAIN = 0
GAIN = 1
PV
DD
or V
DD
= 4.5V to
5.5V
Power-Supply Rejection Ratio
PSRR
V
IN_
= 0V
f = 1kHz, 100mV
P-P
f = 20kHz, 100mV
P-P
THD+N = 1%
Output Power
P
OUT
THD+N = 10%
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio
Maximum Capacitive Load
Switching Frequency
THD+N
SNR
C
L_MAX
f
SW
Average frequency in spread-spectrum
operation
1.00
f = 1kHz
R
L
= 8Ω
R
L
= 4Ω
R
L
= 8Ω
R
L
= 4Ω
R
L
= 8Ω, P
OUT
= 1.2W
R
L
= 4Ω, P
OUT
= 2W
52.4
10.5
9.0
75
71
60
1.4
2.3
1.7
2.8
0.06
0.07
89
93
200
1.22
1.40
%
dB
pF
MHz
W
dB
12.6
45
70
mV
dB
V
DD
I
DD
I
SHDN
R
IN
t
ON
V
BIAS
Inferred from PSRR test
No load
V
SHDN
= 0V
6.5
4.5
12.8
0.1
10
25
1.8
5.5
16
2
13.5
V
mA
μA
kΩ
ms
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
P
OUT
= 1W, BW = 22Hz to 22kHz
P
OUT
= 1W, A-weighted
2
_______________________________________________________________________________________
2.8W, Low-EMI, Stereo, Filterless Class D
Audio Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= PV
DD
= 5.0V, GND = PGND = 0V, V
SHDN
= V
DD
, C
BIAS
= 1μF, speaker impedance = 8Ω in series with 68μH connected between
OUT_+ and OUT_-, GAIN = +10.5dB, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
Spread-Spectrum Modulation
Crosstalk
Channel-to-channel, f = 10kHz, P
OUT
= 1W,
left to right or right to left
Peak voltage,
A-weighted,
32 samples per
second (Note 4)
Into shutdown
Out of shutdown
SYMBOL
CONDITIONS
MIN
TYP
±120
72
-64
dBV
-46
86
%
MAX
UNITS
kHz
dB
MAX9715
Click-and-Pop Level
K
CP
Efficiency
DIGITAL INPUTS (GAIN and
SHDN)
Input High Voltage
Input Low Voltage
Input Leakage Current
η
R
L
= 8Ω in series with 68μH, P
OUT
= 1W
per channel, f = 1kHz
2.0
V
IH
V
IL
I
LEAK
SHDN
GAIN
V
0.8
±1
±1.5
V
μA
Note 1:
All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Note 2:
Speaker amplifier gain is defined as A
V
= (V
OUT_+
- V
OUT_-
) / V
IN
.
Note 3:
Click-and-pop level testing performed with an 8Ω resistive load in series with 68μH inductive load connected across the
Class D BTL outputs. Mode transitions are controlled by the
SHDN
pin. Inputs AC-coupled to GND.
Note 4:
Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For R
L
= 4Ω, L = 33μH.
For R
L
= 8Ω, L = 68μH.
Typical Operating Characteristics
(V
DD
= 5.0V, C
VDD
= 3 x 0.1μF, C
BIAS
= 1μF, C
INL
= C
INR
= 1μF, A
V
= +10.5dB, T
A
= +25°C, unless otherwise noted.) (See the
Typical Operating Circuit/Functional Diagram)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9715toc01
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
V
DD
= 5V
R
L
= 8Ω
P
OUT
= 0.5W
0.1
THD+N (%)
MAX9715toc02
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9715toc03
1
V
DD
= 5V
R
L
= 4Ω
P
OUT
= 0.35W
1
100
10
THD+N (%)
f
IN
= 1kHz AND 20Hz
0.1
THD+N (%)
1
0.1
f
IN
= 10kHz
0.01
V
DD
= 5V
R
L
= 4Ω
P
OUT
= 2W
P
OUT
= 1.25W
0.01
0.01
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
OUTPUT POWER (W)
_______________________________________________________________________________________
3
2.8W, Low-EMI, Stereo, Filterless Class D
Audio Amplifier
MAX9715
Typical Operating Characteristics (continued)
(V
DD
= 5.0V, C
VDD
= 3 x 0.1μF, C
BIAS
= 1μF, C
INL
= C
INR
= 1μF, A
V
= +10.5dB, T
A
= +25°C, unless otherwise noted.) (See the
Typical Operating Circuit/Functional Diagram)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX9715toc04
EFFICIENCY
vs. OUTPUT POWER
90
80
EFFICIENCY (%)
70
60
50
40
30
20
V
DD
= 5V
f
IN
= 1kHz
P
OUT
= P
OUTL
+ P
OUTR
OUTPUTS IN-PHASE
0
1
4
2
3
OUTPUT POWER (W)
5
6
R
L
= 4Ω
R
L
= 8Ω
MAX9715toc05
100
f
IN
= 1kHz
10
f
IN
= 20Hz
THD+N (%)
1
100
0.1
f
IN
= 10kHz
0.01
V
DD
= 5V
R
L
= 8Ω
0.001
0
0.5
1.0
1.5
2.0
2.5
OUTPUT POWER (W)
10
0
EFFICIENCY
vs. SUPPLY VOLTAGE
MAX9715 toc06
OUTPUT POWER
vs. LOAD RESISTANCE
3.5
3.0
OUTPUT POWER (W)
V
DD
= 5V
f
IN
= 1kHz
L
LOAD
= 33μH
MAX9715toc07
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
4.5
4.8
5.0
5.3
f
IN
= 1kHz
P
OUT
= P
OUTL
+ P
OUTR
OUTPUTS IN-PHASE
THD+N = 1%
R
L
= 4Ω
R
L
= 8Ω
4.0
2.5
2.0
1.5
1.0
0.5
0
1
THD+N = 1%
THD+N = 10%
5.5
10
100
1k
SUPPLY VOLTAGE (V)
LOAD RESISTANCE (Ω)
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9715toc08
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9715toc09
5.0
4.5
4.0
OUTPUT POWER (W)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
4.5
4.8
5.0
5.3
f
IN
= 1kHz
R
L
= 4Ω
THD+N = 1%
THD+N = 10%
2.5
THD+N = 10%
2.0
OUTPUT POWER (W)
1.5
THD+N = 1%
1.0
0.5
f
IN
= 1kHz
R
L
= 8Ω
0
5.5
4.5
4.8
5.0
5.3
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
4
_______________________________________________________________________________________
2.8W, Low-EMI, Stereo, Filterless Class D
Audio Amplifier
Typical Operating Characteristics (continued)
(V
DD
= 5.0V, C
VDD
= 3 x 0.1μF, C
BIAS
= 1μF, C
INL
= C
INR
= 1μF, A
V
= +10.5dB, T
A
= +25°C, unless otherwise noted.) (See the
Typical Operating Circuit/Functional Diagram)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9715toc10
MAX9715
CROSSTALK
vs. FREQUENCY
MAX9715 toc11
OUTPUT SPECTRUM
vs. FREQUENCY
-50
-60
AMPLITUDE (dBV)
-70
-80
-90
-100
-110
-120
-130
R
L
= 8Ω
V
DD
= 5V
f
IN
= 1kHz
MAX9715toc12
0
-10
-20
-30
PSRR (dB)
-40
-50
-60
-70
-80
-90
-100
0.01
0.1
1
FREQUENCY (Hz)
10
R
L
= 8Ω
0
-20
CROSSTALK (dB)
-40
-60
-80
-100
-120
P
OUT
= 1W
R
L
= 8Ω
A
V
= +10.5dB
f
IN
= 10kHz
-40
RIGHT TO LEFT
LEFT TO RIGHT
-140
0.01
0.1
1
FREQUENCY (kHz)
10
100
0
5
10
FREQUENCY (kHz)
15
20
100
OUTPUT SPECTRUM
vs. FREQUENCY (A-WEIGHTED)
MAX9715toc13
WIDEBAND SPECTRUM
MAX9715 toc14
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
18
16
SUPPLY CURRENT (mA)
14
12
10
8
6
4
2
0
NO LOAD
INPUTS AC GROUNDED
MAX9715toc15
-40
-50
-60
AMPLITUDE (dBV)
-70
-80
-90
-100
-110
-120
-130
-140
0
5
10
FREQUENCY (kHz)
15
R
L
= 8Ω
V
DD
= 5V
f
IN
= 1kHz
0
-20
AMPLITUDE (dBV)
-40
-60
-80
-100
-120
V
DD
= 5V
INPUTS AC GROUNDED
R
L
= 8Ω
1
10
100
20
20
1000
4.5
4.8
5.0
5.3
5.5
FREQUENCY (MHz)
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
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