MAX98308EWC [MAXIM]
3.3W Mono Class DG Multilevel Audio Amplifier; 3.3W单声道，DG类多音频放大器
| 型号： | MAX98308EWC |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 3.3W Mono Class DG Multilevel Audio Amplifier |
| 文件： | 总21页 (文件大小：3377K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-5848; Rev 4; 3/12
E V A L U A T I O N K I T A V A I L A B L E
General Description
Benefits and Features
The MAX98307/MAX98308 fully differential mono Class
DG multilevel power amplifiers with integrated inverting
charge pumps offer highly efficient, high-power audio
solutions for portable applications.
S High Efficiency Combined with High Output Power
ꢀClass DG Multilevel Modulation Ensures
Maximum Efficiency Over Wide Output Power
Range
Class DG multilevel modulation extends the dynamic
range of the output signal by employing a charge-pump-
generated negative rail as needed to extend the supply
range. This scheme results in high efficiency over a wide
output power range.
S Improves Battery Life
ꢀLow 1.85mA Quiescent Current
S High Output Power at 1% THD+N
ꢀ1.54W at V
ꢀ2.85W at V
= 3.6V, 8I + 68µH Load
= 5V, 8I + 68µH Load
PVDD
PVDD
The ICs combine Maxim’s active emissions limiting edge
rate and overshoot control circuitry with multilevel out-
put modulation to greatly reduce EMI. These features
eliminate the need for output filtering as compared to
traditional Class D devices, reducing component count
and cost.
S High Output Power at 10% THD+N
ꢀ1.77W at V = 3.6V, 8I + 68µH Load
PVDD
ꢀ3.3W at V
= 5V, 8I + 68µH Load
PVDD
S 84% Efficiency (V
= 3.6V, at 500mW Output)
PVDD
S Active Emissions Limiting and Class DG Multilevel
Output Modulation Eliminates EMI Output Filtering
Requirement
The MAX98307’s 16-pin TQFN package features an
adjustable gain set by external resistors. The MAX98308’s
space-saving 12-bump WLP package features an inter-
nally fixed gain of 8.5dB, 11.5dB, 14.5dB, 17.5dB, and
20.5dB set by a single gain input. Both devices operate
over the extended -40NC to +85NC temperature range.
S Integrated Charge Pump and High Efficiency
Results in Small Solution Size
S Excellent RF Immunity
S Click-and-Pop Suppression
S Thermal and Overcurrent Protection
S Low-Current Shutdown Mode
Applications
Cellular Phones
Smartphones
VoIP Phones
Portable Audio
Tablet PCs
Ordering Information appears at end of data sheet.
Notebook Computers
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX98307.related.
Simplified Block Diagrams
V
CC
SHDN
PVDD PVSS SVSS
CHARGE PUMP
GAIN
SHDN
PVDD
PVSS
C1P
C1N
FB+
C1P
C1N
CHARGE PUMP
MAX98308
MAX98307
OUT+
OUT-
IN+
IN-
OUT+
OUT-
IN+
IN-
CLASS DG
AMPLIFIER
CLASS DG
AMPLIFIER
FB-
GND
PGND
GND
PGND
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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.
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
MAX98307 Typical Application Circuit
2.6V TO 5.25
0.1µF
10µF*
0.1µF
10µF
V
SHDN
PVDD SVSS PVSS
14
CC
1
13
3
7
16 C1P
FB+ 12
CHARGE PUMP
4.7µF
15 C1N
20kI
10kI
MAX98307
0.33µF
0.33µF
4
5
OUT+
OUT-
IN+ 11
CLASS DG
AMPLIFIER
10kI
10
IN-
20kI
8
N.C.
FB-
9
2
6
GND
PGND
*SYSTEM BULK CAPACITOR
MAX98308 Typical Application Circuit
2.6V TO 5.25
10µF
10µF*
0.1µF
SHDN
B2
PVDD
PVSS
A3
C1
A1 C1P
B1 C1N
MAX98308
GAIN B3
CHARGE PUMP
4.7µF
0.33µF
0.33µF
A4 OUT+
B4 OUT-
IN+ C2
CLASS DG
AMPLIFIER
C3
IN-
A2
GND
C4
PGND
*SYSTEM BULK CAPACITOR
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2
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
ABSOLUTE MAXIMUM RATINGS
PVDD to GND..........................................................-0.3V to +6V
PGND to GND ..................................................... -0.3V to +0.3V
Continuous Current (all other pins)................................. Q20mA
Duration of OUT+/OUT- Short Circuit to PGND
or PVDD .................................................................Continuous
Short-Circuit Duration Between
OUT+ and OUT- Pins............................................Continuous
C1N to GND .......................................... (V
IN+, IN- (MAX98307)................................ -0.3V to (V
- 0.3V) to +0.3V
PVSS
+ 0.3V)
CC
V
to PVDD (MAX98307).................................. -0.3V to +0.3V
CC
Continuous Power Dissipation (T = +70NC) for Multilayer Board
PVSS to SVSS (MAX97307)..................................-0.3V to +0.3V
PVSS, SVSS to GND (MAX98307)...........................-6V to +0.3V
IN+, IN- (MAX98308)...............................................-0.3V to +6V
PVSS to GND (MAX98308) .....................................-6V to +0.3V
A
TQFN (derate 20.8mW/NC above +70NC)..................1667mW
WLP (derate 13.7mW/NC above +70NC)....................1100mW
Junction Temperature .....................................................+150NC
Operating Temperature Range.......................... -40NC to +85NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) (TQFN-EP)............ +300NC
Soldering Temperature (reflow) ......................................+260NC
All Other Pins to GND ...........................-0.3V to (V
+ 0.3V)
PVDD
Continuous Current Into/Out of PVDD, V , PGND, GND,
CC
OUT+, OUT-, C1P, C1N, PVSS, SVSS ...................... Q800mA
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
TQFN
WLP
Junction-to-Ambient Thermal Resistance (B ) ..........73NC/W
Junction-to-Ambient Thermal Resistance (B ) ..........48NC/W
JA
JA
Junction-to-Case Thermal Resistance (B )...............10NC/W
Junction-to-Case Thermal Resistance (B )...............30NC/W
JC
JC
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
V
= V
= V
= 3.6V, V
= V
= 0V, Z = 8I + 68FH between OUT+ and OUT-, (MAX98307 R
= R
= 10kI,
IN-
PVDD
CC
SHDN
PGND
GND
L
IN+
R
= R
= 20kI), C
= C = 0.33FF, A = 14.5dB, AC measurement bandwidth 20Hz to 20kHz, T = T
to T
, unless
FB+
FB-
IN+
IN-
V
A
MIN
MAX
otherwise noted. Typical values are at T = +25NC.) (Notes 2, 3)
A
PARAMETER
Power-Supply Range
Quiescent Current
Shutdown Current
SYMBOL
, V
CONDITIONS
MIN
TYP
MAX
UNITS
V
V
Guaranteed by PSRR test
2.6
5.25
2.7
10
PVDD CC
I
V
= 3.6V
1.85
0.225
78
mA
µA
DD
PVDD
I
SHDN = GND
= 2.6V to 5.25V
SHDN
V
PVDD
Power-Supply Rejection Ratio
(Note 4)
PSRR
f = 217Hz, 200mV
ripple
ripple
78
dB
P-P
P-P
f = 10kHz, 200mV
67
Time from
MAX98308
25
50
40
80
shutdown or
power-on to full
operation
Turn-On Time
t
ms
V
ON
MAX98307,
R
= 10kI
IN
Input DC Bias Voltage
V
1.3
22
22
22
28
40
BIAS
A
A
A
A
A
= 20.5dB (maximum gain)
15
V
V
V
V
V
= 17.5dB
= 14.5dB
= 11.5dB
= 8.5dB
Input Resistance (MAX98308)
R
kI
IN
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3
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
ELECTRICAL CHARACTERISTICS (continued)
V
= V
= V
= 3.6V, V
= V
= 0V, Z = 8I + 68FH between OUT+ and OUT-, (MAX98307 R
= R
= 10kI,
PVDD
CC
SHDN
PGND
GND
L
IN+
IN-
R
= R
= 20kI), C
= C = 0.33FF, A = 14.5dB, AC measurement bandwidth 20Hz to 20kHz, T = T
to T
, unless
FB+
FB-
IN+
IN-
V
A
MIN
MAX
otherwise noted. Typical values are at T = +25NC.) (Notes 2, 3)
A
PARAMETER
SYMBOL
CONDITIONS
GAIN = short to GND
MIN
20
17
14
11
8
TYP
20.5
17.5
14.5
11.5
8.5
MAX
UNITS
21
18
15
12
9
GAIN = 100kIpulldown to GND
GAIN = short to PVDD
Voltage Gain
(MAX98308)
A
dB
V
GAIN = 100kIpullup to PVDD
GAIN = unconnected
Common-Mode Rejection Ratio
(MAX98308)
CMRR
f
= 1kHz
65
dB
IN
Z = 8I+ 68mH,
L
1.54
V
= 3.6V
PVDD
f
= 1kHz,
Z = 8I+ 68mH,
IN
L
2
THD+N = 1%
V
= 4.2V
PVDD
Z = 8I+ 68mH,
L
2.85
1.77
2.3
V
= 5.0V
PVDD
Output Power (MAX98307)
P
W
OUT
Z = 8I+ 68mH,
L
V
= 3.6V
PVDD
f
= 1kHz,
Z = 8I+ 68mH,
IN
L
THD+N = 10%
V
= 4.2V
PVDD
Z = 8I+ 68mH,
L
3.3
V
= 5.0V
PVDD
Z
V
= 8I+ 68mH,
SPK
1.4
= 3.6V
PVDD
Z
V
= 8I+ 68mH,
SPK
THD+N ≤ 1%
THD+N ≤ 10%
1.92
2.7
= 4.2V
PVDD
Z
V
= 8I+ 68mH,
= 5.0V
SPK
Output Power (MAX98308)
P
W
OUT
PVDD
Z
V
= 8I+ 68mH,
= 3.6V
SPK
1.57
2.13
PVDD
Z
V
= 8I+ 68mH,
= 4.2V
SPK
PVDD
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4
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
ELECTRICAL CHARACTERISTICS (continued)
V
= V
= V
= 3.6V, V
= V
= 0V, Z = 8I + 68FH between OUT+ and OUT-, (MAX98307 R
= R
= 10kI,
PVDD
CC
SHDN
PGND
GND
L
IN+
IN-
R
= R
= 20kI), C
= C = 0.33FF, A = 14.5dB, AC measurement bandwidth 20Hz to 20kHz, T = T
to T
, unless
FB+
FB-
IN+
IN-
V
A
MIN
MAX
otherwise noted. Typical values are at T = +25NC.) (Notes 2, 3)
A
PARAMETER
SYMBOL
CONDITIONS
= 1W
OUT
MIN
TYP
MAX
UNITS
Total Harmonic Distortion Plus
Noise
THD+N
f
= 1kHz, P
0.05
%
IN
Output Offset Voltage
V
1
5
mV
T
= +25°C
OS
A
Peak voltage,
A-weighted,
32 samples per
Into shutdown
-65
Click-and-Pop Level
K
dBV
CP
Out of shutdown
-65
340
84
second (Notes 4, 5)
Output Switching Frequency
Efficiency
kHz
%
f
= 1kHz, P
at 500mW,
IN
OUT
THD+N = 0.02%
η
f
= 1kHz, P at 1W, THD+N = 0.05%
OUT
82
2
IN
Current Limit
Output Noise
I
A
RMS
LIM
V
A-weighted
52
µV
RMS
N
LOGIC INPUT (SHDN)
Input Voltage High
V
1.4
V
V
IH
Input Voltage Low
V
0.4
10
IL
Input Leakage Current
T
= +25NC
µA
A
Note 2: 100% production tested at T = +25°C. Specifications over temperature limits are guaranteed by design.
A
Note 3: Testing performed with a resistive load in series with an inductor to simulate an actual speaker. For R = 8I, L = 68FH.
L
Note 4: Amplifier inputs AC-coupled to GND.
Note 5: Specified at room temperature with an 8I resistive load in series with a 68FH inductive load connected across the BTL
outputs. Mode transitions controlled by SHDN active-low shutdown control.
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5
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Typical Operating Characteristics
(V
= V
= 10kω, R
= V
FB+
= 3.6V, V
= V
= 0V, Z = 8ω + 68FH between OUT+ and OUT-, A = 14.5dB (MAX98307 R
=
PVDD
CC
SHDN
= R
PGND
GND
L
V
IN+
R
= 20kω), C
= C = 0.33µF, AC measurement bandwidth 20Hz to 20kHz.)
IN-
FB-
IN+ IN-
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER (MAX98307)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER (MAX98307)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER (MAX98307)
100
10
1
100
10
100
10
V
= 3.6V
V
= 4.2V
V
= 5V
PVDD
PVDD
PVDD
f
IN
= 100Hz
f = 100Hz
IN
f
= 100Hz
IN
1
1
f
= 6kHz
f
IN
= 6kHz
IN
f
IN
= 6kHz
0.1
0.1
0.1
f
= 1kHz
IN
f
IN
= 1kHz
f
= 1kHz
IN
0.01
0.01
0.001
0.01
0.001
0.001
0
0.5
1.0
1.5
2.0
2.5
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT POWER (W)
0
1
2
3
4
5
OUTPUT POWER (W)
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER (MAX98308)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER (MAX98308)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER (MAX98308)
100
10
100
10
100
10
V
= 3.6V
f
V
= 4.2V
V
= 5V
PVDD
PVDD
PVDD
= 100Hz
IN
f
IN
= 100Hz
f
IN
= 100Hz
1
1
1
f
IN
= 6kHz
f
= 6kHz
IN
f
= 6kHz
IN
0.1
0.1
0.1
f
IN
= 1kHz
f
IN
= 1kHz
f
= 1kHz
IN
0.01
0.001
0.01
0.001
0.01
0.001
0
0.5
1.0
1.5
2.0
2.5
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT POWER (W)
OUTPUT POWER (W)
OUTPUT POWER (W)
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6
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Typical Operating Characteristics (continued)
(V
= V
= 10kω, R
= V
FB+
= 3.6V, V
= V
= 0V, Z = 8ω + 68FH between OUT+ and OUT-, A = 14.5dB (MAX98307 R
=
PVDD
CC
SHDN
= R
PGND
GND
L
V
IN+
R
= 20kω), C
= C = 0.33µF, AC measurement bandwidth 20Hz to 20kHz.)
IN-
FB-
IN+ IN-
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (MAX98307)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (MAX98307)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (MAX98307)
10
1
10
1
10
1
V
= 3.6V
V
= 4.2V
V
= 5V
PVDD
PVDD
PVDD
P
OUT
= 1.3W
P
OUT
= 1.6W
P
OUT
= 2.4W
0.1
0.1
0.1
0.01
0.01
0.001
0.01
0.001
P
OUT
= 300mW
P
OUT
= 500mW
P
OUT
= 700mW
0.001
10
100
1k
FREQUENCY (kHz)
10k
100k
10
100
1k
FREQUENCY (kHz)
10k
100k
10
100
1k
FREQUENCY (kHz)
10k
100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (MAX98308)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (MAX98308)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (MAX98308)
10
1
10
1
10
1
V
= 3.6V
V
= 4.2V
V
= 5V
PVDD
PVDD
PVDD
P
OUT
= 1.1W
P
OUT
= 1.6W
P
OUT
= 2.4W
0.1
0.1
0.1
0.01
0.001
0.01
0.001
0.01
0.001
P
OUT
= 300mW
P
OUT
= 500mW
P
OUT
= 700mW
10
100
1k
FREQUENCY (kHz)
10k
100k
10
100
1k
FREQUENCY (kHz)
10k
100k
10
100
1k
FREQUENCY (kHz)
10k
100k
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7
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Typical Operating Characteristics (continued)
(V
= V
= 10kω, R
= V
FB+
= 3.6V, V
= V
= 0V, Z = 8ω + 68FH between OUT+ and OUT-, A = 14.5dB (MAX98307 R
IN+
=
PVDD
CC
SHDN
= R
PGND
GND
L
V
R
= 20kω), C
= C = 0.33µF, AC measurement bandwidth 20Hz to 20kHz.)
IN-
FB-
IN+ IN-
OUTPUT POWER vs. LOAD RESISTANCE
(MAX98307)
OUTPUT POWER vs. LOAD RESISTANCE
(MAX98307)
OUTPUT POWER vs. LOAD RESISTANCE
(MAX98307)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
2.5
2.0
1.5
1.0
0.5
0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= 3.6V
= 1kHz
V
= 4.2V
= 1kHz
V
= 5V
PVDD
PVDD
PVDD
f
f
f = 1kHz
IN
IN
IN
THD+N = 10%
THD+N = 10%
THD+N = 10%
THD+N = 1%
THD+N = 1%
THD+N = 1%
1
10
100
1k
1
10
100
1k
1
10
100
1k
LOAD RESISTANCE (I)
LOAD RESISTANCE (I)
LOAD RESISTANCE (I)
OUTPUT POWER vs. LOAD RESISTANCE
(MAX98308)
OUTPUT POWER vs. LOAD RESISTANCE
(MAX98308)
OUTPUT POWER vs. LOAD RESISTANCE
(MAX98308)
1.6
1.4
1.2
1.0
0
2.5
2.0
1.5
1.0
0.5
0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= 4.2V
= 1kHz
V
= 5V
PVDD
f = 1kHz
IN
PVDD
V
= 3.6V
= 1kHz
PVDD
f
IN
f
IN
THD+N = 10%
THD+N = 10%
THD+N = 10%
0.8
0.6
0.2
0
THD+N = 1%
THD+N = 1%
THD+N = 1%
10
1
10
100
1k
1
100
1k
1
10
100
1k
LOAD RESISTANCE (I)
LOAD RESISTANCE (I)
LOAD RESISTANCE (I)
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8
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Typical Operating Characteristics (continued)
(V
= V
= 10kω, R
= V
FB+
= 3.6V, V
= V
= 0V, Z = 8ω + 68FH between OUT+ and OUT-, A = 14.5dB (MAX98307 R
=
PVDD
CC
SHDN
= R
PGND
GND
L
V
IN+
R
= 20kω), C = C = 0.33µF, AC measurement bandwidth 20Hz to 20kHz.)
IN-
FB-
IN+ IN-
OUTPUT POWER vs. SUPPLY VOLTAGE
(MAX98307)
GAIN vs. FREQUENCY
(MAX98308)
OUTPUT POWER vs. SUPPLY VOLTAGE
(MAX98308)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
30
20
3.5
3.0
2.5
2.0
f
= 1kHz
GAIN = V
PVDD
GAIN = PGND
IN
f
= 1kHz
IN
THERMALLY LIMITED
GAIN = 100kI TO PGND
THD+N = 10%
THD+N = 1%
THD+N = 10%
10
GAIN = 100kI TO V
PVDD
1.5
1.0
0
GAIN = UNCONNECTED
THD+N = 1%
-10
-20
0.5
0
2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
SUPPLY VOLTAGE (V)
10
100
1k
10k
100k
2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
SUPPLY VOLTAGE (V)
FREQUENCY (kHz)
EFFICIENCY vs. OUTPUT POWER
(MAX98307)
EFFICIENCY vs. OUTPUT POWER
(MAX98307)
EFFICIENCY vs. OUTPUT POWER
(MAX98307)
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
V
= 3.6V
= 1kHz
V
= 4.2V
= 1kHz
V
= 5V
PVDD
PVDD
PVDD
f
IN
f
IN
f = 1kHz
IN
0
0.2
0.4
0.6
0.8
1.0
1.2
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
2.5
OUTPUT POWER (W)
OUTPUT POWER (W)
����������������������������������������������������������������� Maxim Integrated Products
9
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Typical Operating Characteristics (continued)
(V
= V
= 10kω, R
= V
FB+
= 3.6V, V
= V
= 0V, Z = 8ω + 68FH between OUT+ and OUT-, A = 14.5dB (MAX98307 R
=
PVDD
CC
SHDN
= R
PGND
GND
L
V
IN+
R
= 20kω), C
= C = 0.33µF, AC measurement bandwidth 20Hz to 20kHz.)
IN-
FB-
IN+ IN-
EFFICIENCY vs. OUTPUT POWER
(MAX98308)
EFFICIENCY vs. OUTPUT POWER
(MAX98308)
EFFICIENCY vs. OUTPUT POWER
(MAX98308)
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
V
= 3.6V
= 1kHz
V
PVDD
= 4.2V
= 1kHz
V = 5V
PVDD
f = 1kHz
IN
PVDD
f
IN
f
IN
0
0.2
0.4
0.6
0.8
1.0
1.2
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
2.5
OUTPUT POWER (W)
OUTPUT POWER (W)
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
SUPPLY CURRENT vs. SUPPLY VOLTAGE
3.0
2.5
2.0
1.5
1.0
0.5
0
400
350
300
250
200
150
100
50
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
V
= 200mV
P-P
RIPPLE
V
= 3.6V
PVDD
f
= 1kHz
IN
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
10
100
1k
FREQUENCY (Hz)
10k
100k
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
���������������������������������������������������������������� Maxim Integrated Products 10
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Typical Operating Characteristics (continued)
(V
= V
= 10kω, R
= V
FB+
= 3.6V, V
= V
= 0V, Z = 8ω + 68FH between OUT+ and OUT-, A = 14.5dB (MAX98307 R
=
PVDD
CC
SHDN
= R
PGND
GND
L
V
IN+
R
= 20kω), C
= C = 0.33µF, AC measurement bandwidth 20Hz to 20kHz.)
IN-
FB-
IN+
COMMON-MODE REJECTION
RATIO vs. FREQUENCY (MAX98307)
IN-
COMMON-MODE REJECTION
RATIO vs. FREQUENCY (MAX98308)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
-10
-20
-30
-40
-50
-60
-70
-80
f
IN
= 1kHz
10
100
1k
10k
100k
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
STARTUP RESPONSE
SHUTDOWN RESPONSE
WIDEBAND vs. FREQUENCY
MAX98307 toc33
MAX98307 toc34
0
-20
V
PVDD
= 3.6V
V
SHDN
2V/div
-40
V
SHDN
-60
2V/div
-80
-100
-120
-140
-160
I
I
SPEAKER
100mA/div
SPEAKER
100mA/div
-180
100k
20ms/div
20ms/div
1G
10G
100G
FREQUENCY (Hz)
CLIPPING WAVEFORM 10% THD+N
INBAND OUTPUT SPECTRUM
MAX98307 toc37
0
-20
V
= 3.6V
PVDD
OUT+
1V/div
-40
-60
-80
-100
-120
OUT-
1V/div
-140
10
200µs/div
100
1k
10k
100k
FREQUENCY (Hz)
���������������������������������������������������������������� Maxim Integrated Products 11
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Pin/Bump Configurations
TOP VIEW
TOP VIEW
(BUMPS SIDE DOWN)
MAX98308
2
12
11
10
9
1
3
4
+
N.C.
8
7
6
5
A
B
C
C1P
C1N
GND
SHDN
IN+
PVDD
OUT+
V
13
CC
PVSS 14
SVSS
PGND
OUT-
GAIN
IN-
OUT-
MAX98307
C1N
C1P
15
16
PVSS
PGND
EP
+
WLP
1
2
3
4
TQFN
Pin/Bump Description
PIN
BUMP
NAME
FUNCTION
MAX98307
MAX98308
Active-Low Shutdown. Connect to GND for shutdown. Connect to PVDD for normal
operation.
1
B2
SHDN
2
3
A2
A3
A4
B4
C4
—
GND
PVDD
OUT+
OUT-
PGND
SVSS
N.C.
Substrate and Signal Ground
Power and Charge-Pump Supply. Bypass to PGND with a 0.1FF capacitor.
Positive Amplifier Output
4
5
Negative Amplifier Output
6
Power Ground
7
Amplifier Negative Power Supply. Connect to PVSS (MAX98307).
No Connection. Not internally connected. Connect to GND or leave unconnected.
Negative Amplifier Feedback
8
—
9
—
FB-
10
11
12
—
13
14
C3
C2
—
IN-
Negative Amplifier Input
IN+
Positive Amplifier Input
FB+
Positive Amplifier Feedback
B3
—
GAIN
See Table 1 MAX98308 Gain Configuration for more information.
Signal Supply
V
CC
C1
PVSS
Charge-Pump Output. Connect a 10FF capacitor between PVSS and PGND.
Charge-Pump Flying Capacitor Negative Terminal. Connect a 4.7FF capacitor
between C1N and C1P.
15
16
B1
A1
C1N
Charge-Pump Flying Capacitor Positive Terminal. Connect a 4.7FF capacitor
between C1N and C1P.
C1P
EP
Exposed Pad (TQFN Only). Internally connected to GND. Connect to a large ground
plane with multiple vias to maximize thermal performance. Not intended as an
electrical connection point.
—
—
���������������������������������������������������������������� Maxim Integrated Products 12
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
efficiently supply the required signal power. For a low out-
put signal swing requirement (below the battery supply rail
Detailed Description
V
), the output range is between V
and ground.
The MAX98307/MAX98308 fully differential mono Class
DG multilevel power amplifiers with integrated inverting
charge pumps offer highly efficient, high-power audio
solutions for portable applications.
PVDD
PVDD
When output swing above V
internal inverting charge-pump-generated negative rail
replaces ground as the lower supply. The high output
is required, V
, an
PVSS
PVDD
swing range is then V
to V , approximately dou-
PVSS
PVDD
The new Class DG multilevel modulation scheme extends
the dynamic range of the output signal by employing a
charge-pump-generated negative rail, which is used as
needed to extend the supply range. When the negative
rail is not needed, the output is drawn entirely from the
standard supply. This scheme results in high efficiency
over a wide output power range.
ble the low swing range. This approach efficiently man-
ages power consumption by switching the operating rails
as needed according to the output swing requirements.
Additionally, multilevel output modulation is employed in to
draw the maximum possible power from the lower imped-
ance battery supply rail, V
impedance charge-pump-generated rail V
accomplished by generating PWM signals that swing
from ground to V or from ground to V at either
end of the bridge tied load (BTL) rather than continually
swinging from V to V The signals are modu-
, rather than the higher
PVDD
. This is
PVSS
The power amplifier incorporates active emissions limit-
ing edge rate and overshoot control circuitry in combi-
nation with the multilevel output modulation scheme to
greatly reduce EMI. These features eliminate the need for
output filtering as compared to traditional Class D ampli-
fiers, which reduces an application’s component count.
PVDD
PVSS
.
PVSS
PVDD
lated in such a way that V
to generate low-end signal swing.
is used only as necessary
PVSS
The MAX98307 has an adjustable gain set by external
resistors. The MAX98308 has preset fixed gains of 8.5dB,
11.5dB, 14.5dB, 17.5dB, and 20.5dB set by a gain select
input (GAIN).
These combined operations ensure that power dissipa-
tion due to R
loss and charge-pump impedance
DS(ON)
is minimized, and that efficiency and output power is
maximized across the audio range. Class DG multilevel
operation is shown as Figure 1.
Class DG Multilevel Operation
The ICs’ filterless Class DG multilevel amplifiers feature
a proprietary Maxim output stage that offers higher effi-
ciency over a greater output power range than previous
amplifiers. The amplifier combines Class D switching
output efficiency and Class G supply level shifting with a
multilevel output modulation scheme that with a 5V supply
has efficiency better than 80% efficiency over the 0.35W
to 2.2W output range.
MAX98307 fig01
OUT+
5V/div
OUT-
5V/div
The Class DG multilevel output stage uses pulse-width
modulation (PWM), a rail-to-rail digital output signal with
variable duty cycle, to approximate an analog input signal
as in a Class D amplifier. Rail-to-rail operation ensures that
OUT+ - OUT-
10V/div
any dissipation at the output is due solely to the R
DS(ON)
400µs/div
of the power output MOSFETs. The Class DG multilevel
output stage also senses the magnitude of the output
signal and switches the supply rails as needed to more
Figure 1. Class DG Multilevel Operation
���������������������������������������������������������������� Maxim Integrated Products 13
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
The Class DG multilevel efficiency compares favor-
ably with Class AB and Class G amplifiers as shown in
Figure 2. Note that efficiency at 1W is 85%.
EFFICIENCY vs. OUTPUT POWER
90
80
70
60
50
40
30
20
10
0
EMI Filterless Output Stage
Traditional Class D amplifiers require the use of external
LC filters, or shielding, to meet electromagnetic-interfer-
ence (EMI) regulation standards. The active emissions
limiting edge-rate control circuitry and Class DG multilev-
el modulation scheme reduce EMI emissions without the
need for external filtering components, while maintaining
high efficiency (see Figure 3).
MAX98307/MAX98308
CLASS DG MULTILEVEL AMPLIFIER
CLASS G AMPLIFIER
CLASS AB AMPLIFIER
V
= 5V
PVDD
f
= 1kHz
IN
Amplifier Current Limit
If the output current of the speaker amplifier exceeds the
current limit, the ICs disable the outputs for approximate-
ly 100Fs. After 100Fs, the outputs are reenabled. If the
fault condition still exists, the ICs continue to disable and
reenable the outputs until the fault condition is removed.
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT POWER (W)
Figure 2. Class DG Multilevel vs. Typical Class G and Class
AB Amplifier Efficiency
90
70
50
30
EN55022B LIMIT
HORIZONTAL
10
VERTICAL
-10
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
Figure 3. EMI Performance with V
= 5V, 12in of Speaker Cable, No Output Filter
PVDD
���������������������������������������������������������������� Maxim Integrated Products 14
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
feature differential amplifiers, their voltage gain is set in
differing manners.
Click-and-Pop Suppression
The speaker amplifier features Maxim’s comprehensive
click-and-pop suppression. During startup, the click-
and-pop suppression circuitry reduces any audible
transient sources internal to the device. When entering
shutdown, the differential speaker outputs quickly and
simultaneously ramp down to PGND.
The MAX98307 employs external feedback resistors as
shown in Figure 4. Voltage gain of the input amplifier is
set as:
R
FB
A
= 20log
dB + 8.5dB
(
)
V
Thermal and Short Circuit Protection
The ICs automatically enter thermal shutdown when the
die temperature is greater than +160NC and reactivate at
less than +135NC. Additionally, if the outputs are shorted
to each other or either rail, the amplifier prevents cata-
strophic loss by disabling the outputs.
R
IN
where A is the desired voltage gain in decibels. R
V
IN+
should be equal to R , and R
should be equal to R
.
IN-
FB+
FB-
In differential input configurations, the common-mode
rejection ratio (CMRR) is primarily limited by the external
resistor and capacitor matching. Ideally, to achieve the
highest possible CMRR, the following external compo-
nents should be selected where:
Shutdown
The ICs feature a low-power shutdown mode, drawing
less than 0.225FA (typ) supply current. Drive SHDN low
to put the IC into the shutdown state.
R
R
R
FB-
FB+
=
R
IN+
IN-
Applications Information
and
= C
Filterless Class DG Operation
Traditional Class DG amplifiers require an output filter.
The filter adds cost and size, as well as decreases effi-
ciency and THD+N performance. The ICs’ active emis-
sions limiting and Class DG multilevel output modulation
allow for filterless operation while reducing external com-
ponent count, and thereby, cost.
C
IN+
IN-
The gain of the MAX98308 is selectable by connecting
the gain-select bump GAIN as described in Table 1.
Because the switching frequency of the ICs is well
beyond the bandwidth of most speakers, voice coil
movement due to the switching frequency is very small.
Use a speaker with a series inductance > 10FH. Typical
8I speakers exhibit series inductances in the 20FH to
100FH range.
FB+
MAX98307
R
FB+
R
IN+
IN+
IN-
CLASS DG
OUTPUT
STAGE
Differential Input Amplifier
The ICs feature a differential input configuration, making
the device compatible with many codecs and offering
improved noise immunity as compared to single-ended
input amplifiers. In devices such as mobile phones, noisy
digital signals can be picked up by an amplifier’s input
traces. A differential amplifier amplifies the difference
of the two inputs, while signals common to both inputs,
such as switching noise, are rejected. While both ICs
R
IN-
R
FB-
FB-
Figure 4. Setting the Voltage Gain of the MAX98307
���������������������������������������������������������������� Maxim Integrated Products 15
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Table 1. MAX98308 Gain Configuration
GAIN
PREAMPLIFIER GAIN (dB)
OVERALL GAIN (dB)
Unconnected
0
3
8.5
100kIto V
11.5
14.5
17.5
20.5
PVDD
Short to V
6
PVDD
100kIto PGND
9
Short to PGND
12
Note: For both ICs, the Class DG output stage has a fixed gain of 8.5dB. Any gain or attenuation set by the external input stage
resistors adds to or subtracts from this fixed gain.
Charge-Pump Flying Capacitor
The value of the charge-pump flying capacitor affects
the load regulation and output resistance of the charge
pump. A charge-pump flying capacitor value that is too
small (less than 1FF) degrades the amplifier’s ability to
provide sufficient current drive. Increasing the value of
this flying capacitor and decreasing the ESR improves
load regulation and reduces the charge-pump output
impedance, which improves the output power and effi-
ciency of the amplifier. A 4.7FF or greater value, low-ESR
capacitor is recommended.
Component Selection
Power-Supply Input (PVDD)
PVDD powers the speaker amplifier and has a range
of 2.6V to 5.25V. Bypass PVDD with 0.1FF and 10FF
capacitors in parallel to PGND. Apply additional bulk
capacitance at the device if long input traces between
PVDD and the supply are used.
Input Coupling Capacitors
The AC-coupling capacitors (C ) and input resistors
IN
(R ) form highpass filters that remove any DC bias from
IN
an input signal. See the MAX98307 Typical Application
Charge-Pump Hold Capacitor
The charge-pump hold capacitor value and ESR directly
affect the ripple at the charge-pump rail, PVSS. Increasing
the charge-pump hold capacitor value reduces output
ripple. Likewise, decreasing the ESR of this capacitor
reduces both ripple and output resistance. A 10FF or
greater value, low-ESR capacitor is recommended.
Circuit and MAX98308 Typical Application Circuit. C
IN
prevents any DC components from the input signal
source appearing at the amplifier outputs. The -3dB point
of the highpass filter, assuming zero source impedance
due to the input signal source, is given by:
1
f−
=
3dB
2π × R × C
IN
IN
Layout and Grounding
Proper layout and grounding are essential for optimum
performance. Good grounding improves audio perfor-
mance and prevents switching noise from coupling into
the audio signal.
Choose C so that f
quency of interest. Setting f
is well below the lowest fre-
IN
-3dB
too high affects the
-3dB
amplifier’s low-frequency response. Use capacitors with
adequately low voltage coefficient (X5R or X7R recom-
mended) for best low frequency THD+N performance.
Use wide, low-resistance output traces. As load imped-
ance decreases, the current drawn from the device
increases. At higher current, the resistance of the output
traces decrease the power delivered to the load. For
example, if 2W is delivered from the device output to an
8I load through 100mI of total speaker trace, 1.97W is
delivered to the speaker. If power is delivered through
10mI of total speaker trace, 1.998W is delivered to the
speaker. Wide output, supply, and ground traces also
improve the power dissipation of the device.
Charge-Pump Capacitor Selection
Use capacitors with an equivalent series resistance
(ESR) less than 50mI for optimum performance. Low-
ESR ceramic capacitors minimize the output resistance
of the charge pump. For best performance over the
extended temperature range, select capacitors with an
X7R dielectric and a rated voltage of at least 6.3V.
The ICs are inherently designed for excellent RF immu-
nity. For best performance, add ground fills around all
signal traces on top or bottom PCB planes.
���������������������������������������������������������������� Maxim Integrated Products 16
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
The copper polygon to which the exposed pad is
attached should have multiple vias to the opposite side
of the PCB. Make this polygon as large as possible within
the system’s constraints for signal routing.
Thermal Considerations
Class DG multilevel amplifiers provide much better effi-
ciency and thermal performance than a comparable Class
AB or Class G amplifiers. However, the system’s thermal
performance must be considered with realistic expecta-
tions and include consideration of many parameters. This
section examines Class DG multilevel amplifiers using
general examples to illustrate good design practices.
MAX98308 (WLP) Applications Information
For the latest application details on WLP construction,
dimensions, tape carrier information, PCB techniques,
bump-pad layout, and recommended reflow temperature
profile, as well as the latest information on reliability test-
ing results, refer to Application Note 1891: Wafer-Level
Packaging (WLP) and Its Applications.
MAX98307 (TQFN) Applications Information
The exposed pad is the primary route of keeping heat
away from the IC. With a bottom-side exposed pad, the
PCB and its copper becomes the primary heatsink for
the Class DG multilevel amplifier. Solder the exposed
pad to a large copper polygon. Add as much copper
as possible from this polygon to any adjacent pin on
the amplifier as well as to any adjacent components,
provided these connections are at the same potential.
These copper paths must be as wide as possible. Each
of these paths contributes to the overall thermal capabili-
ties of the system.
Ordering Information
PART
GAIN SET
External
Internal
PIN-PACKAGE
16 TQFN-EP*
12 WLP
MAX98307ETE+
MAX98308EWC+
Note: All devices operate over the -40°C to +85°C temperature
range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
���������������������������������������������������������������� Maxim Integrated Products 17
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Package Information
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains
to the package regardless of RoHS status.
PACKAGE TYPE
16 TQFN-EP
12 WLP
PACKAGE CODE
T1633-5
OUTLINE NO.
21-0136
LAND PATTERN NO.
90-0032
W121A1+1
21-0449
Refer to Application Note 1891
���������������������������������������������������������������� Maxim Integrated Products 18
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains
to the package regardless of RoHS status.
���������������������������������������������������������������� Maxim Integrated Products 19
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains
to the package regardless of RoHS status.
COMMON DIMENSIONS
Pin 1
Indicator
A
A1
A2
A3
b
0.64 ±0.05
0.19 ±0.03
0.45 REF
E
MARKING
A3
1
A1
0.025 BASIC
0.27 ±0.03
0.80 BASIC
1.20 BASIC
0.40 BASIC
0.00 BASIC
0.20 BASIC
A
A2
D
A
AAAA
D1
E1
e
0.05
S
S
See Note 7
SD
SE
SIDE VIEW
TOP VIEW
E
D
DEPOPULATED
BUMPS
MAX
1.75
1.64
MIN
1.61
1.61
MIN
1.23
1.22
MAX
1.37
1.25
PKG. CODE
W121A1+1
W121F1+1
NONE
NONE
E1
SE
e
B
NOTES:
C
B
1. Terminal pitch is defined by terminal center to center value.
2. Outer dimension is defined by center lines between scribe lines.
3. All dimensions in millimeter.
D1
SD
4. Marking shown is for package orientation reference only.
5. Tolerance is ± 0.02 unless specified otherwise.
6. All dimensions apply to PbFree (+) package codes only.
7. Front - side finish can be either Black or Clear.
A
1
2
3
4
A
b
M
S
AB
0.05
BOTTOM VIEW
TITLE
PACKAGE OUTLINE, 12 BUMPS
WLP PKG. .40mm PITCH
REV.
APPROVAL
DOCUMENT CONTROL NO.
1
- DRAWING NOT TO SCALE -
1
21-0449
D
���������������������������������������������������������������� Maxim Integrated Products 20
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
1
2
6/11
8/11
9/11
Initial release
—
4
Updated output power conditions in the Electrical Characteristics table
Updated Electrical Characteristics table and TOC 20
2, 4, 8
Added EP to the Pin Description section and removed future product
reference for the MAX98308
3
4
9/11
3/12
12, 17
3, 6
Added R typical values for all gains and corrected error on TOCs 1–6
IN
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical
Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
21
©
2012 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
相关型号：
MAX98309EWL+
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