19-5848; Rev 4; 3/12
EVALUATION KIT AVAILABLE
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
General Description
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.
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.
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.
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.
Benefits and Features
S
High Efficiency Combined with High Output Power
Class DG Multilevel Modulation Ensures
Maximum Efficiency Over 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
PVDD
= 3.6V, 8I + 68µH Load
2.85W at V
PVDD
= 5V, 8I + 68µH Load
S
High Output Power at 10% THD+N
1.77W at V
PVDD
= 3.6V, 8I + 68µH Load
3.3W at V
PVDD
= 5V, 8I + 68µH Load
S
84% Efficiency (V
PVDD
= 3.6V, at 500mW Output)
S
Active Emissions Limiting and Class DG Multilevel
Output Modulation Eliminates EMI Output Filtering
Requirement
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
Ordering Information
appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to
www.maxim-ic.com/MAX98307.related.
Applications
Cellular Phones
Smartphones
Notebook Computers
VoIP Phones
Portable Audio
Tablet PCs
Simplified Block Diagrams
SHDN
FB+
CHARGE PUMP
V
CC
PVDD
PVSS
SVSS
C1P
C1N
SHDN
GAIN
PVDD
PVSS
C1P
MAX98307
IN+
IN-
CLASS DG
AMPLIFIER
OUT+
IN+
OUT-
IN-
MAX98308
CHARGE PUMP
C1N
OUT+
CLASS DG
AMPLIFIER
OUT-
FB-
GND
PGND
GND
PGND
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
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.
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
SHDN
1
FB+ 12
20kI
0.33µF 10kI
0.33µF 10kI
V
CC
13
3
PVDD
SVSS PVSS
7
14
16 C1P
15 C1N
4 OUT+
4.7µF
CHARGE PUMP
MAX98307
IN+ 11
IN- 10
CLASS DG
AMPLIFIER
5 OUT-
20kI
FB- 9
2
GND
*SYSTEM BULK CAPACITOR
6
PGND
8 N.C.
MAX98308 Typical Application Circuit
2.6V TO 5.25
10µF*
0.1µF
10µF
SHDN
B2
PVDD
A3
C1
PVSS
A1 C1P
MAX98308
GAIN B3
0.33µF
0.33µF
CHARGE PUMP
B1 C1N
A4 OUT+
4.7µF
IN+ C2
IN- C3
CLASS DG
AMPLIFIER
B4 OUT-
A2
GND
*SYSTEM BULK CAPACITOR
C4
PGND
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
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
C1N to GND .......................................... (V
PVSS
- 0.3V) to +0.3V
IN+, IN- (MAX98307)................................ -0.3V to (V
CC
+ 0.3V)
V
CC
to PVDD (MAX98307) .................................. -0.3V to +0.3V
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
All Other Pins to GND ...........................-0.3V to (V
PVDD
+ 0.3V)
Continuous Current Into/Out of PVDD, V
CC
, PGND, GND,
OUT+, OUT-, C1P, C1N, PVSS, SVSS ......................
Q800mA
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
Continuous Power Dissipation (T
A
= +70NC) for Multilayer Board
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
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
Junction-to-Ambient Thermal Resistance (B
JA
) ..........48NC/W
Junction-to-Case Thermal Resistance (B
JC
) ...............10NC/W
WLP
Junction-to-Ambient Thermal Resistance (B
JA
) ..........73NC/W
Junction-to-Case Thermal Resistance (B
JC
) ...............30NC/W
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
PVDD
= V
CC
= V
SHDN
= 3.6V, V
PGND
= V
GND
= 0V, Z
L
= 8I + 68FH between OUT+ and OUT-, (MAX98307 R
IN+
= R
IN-
= 10kI,
R
FB+
= R
FB-
= 20kI), C
IN+
= C
IN-
= 0.33FF, A
V
= 14.5dB, AC measurement bandwidth 20Hz to 20kHz, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are at T
A
= +25NC.) (Notes 2, 3)
PARAMETER
Power-Supply Range
Quiescent Current
Shutdown Current
Power-Supply Rejection Ratio
(Note 4)
SYMBOL
V
PVDD
, V
CC
I
DD
I
SHDN
PSRR
V
PVDD
= 3.6V
SHDN
= GND
V
PVDD
= 2.6V to 5.25V
f = 217Hz, 200mV
P-P
ripple
f = 10kHz, 200mV
P-P
ripple
t
ON
V
BIAS
A
V
= 20.5dB (maximum gain)
A
V
= 17.5dB
Input Resistance (MAX98308)
R
IN
A
V
= 14.5dB
A
V
= 11.5dB
A
V
= 8.5dB
15
Time from
shutdown or
power-on to full
operation
MAX98308
MAX98307,
R
IN
= 10kI
CONDITIONS
Guaranteed by PSRR test
MIN
2.6
1.85
0.225
78
78
67
25
50
1.3
22
22
22
28
40
kI
40
ms
80
V
dB
TYP
MAX
5.25
2.7
10
UNITS
V
mA
µA
Turn-On Time
Input DC Bias Voltage
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
3
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
ELECTRICAL CHARACTERISTICS (continued)
V
PVDD
= V
CC
= V
SHDN
= 3.6V, V
PGND
= V
GND
= 0V, Z
L
= 8I + 68FH between OUT+ and OUT-, (MAX98307 R
IN+
= R
IN-
= 10kI,
R
FB+
= R
FB-
= 20kI), C
IN+
= C
IN-
= 0.33FF, A
V
= 14.5dB, AC measurement bandwidth 20Hz to 20kHz, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are at T
A
= +25NC.) (Notes 2, 3)
PARAMETER
SYMBOL
CONDITIONS
GAIN = short to GND
Voltage Gain
(MAX98308)
GAIN = 100kI pulldown to GND
A
V
GAIN = short to PVDD
GAIN = 100kI pullup to PVDD
GAIN = unconnected
Common-Mode Rejection Ratio
(MAX98308)
CMRR
f
IN
= 1kHz
Z
L
= 8I + 68mH,
V
PVDD
= 3.6V
f
IN
= 1kHz,
THD+N = 1%
Z
L
= 8I + 68mH,
V
PVDD
= 4.2V
Z
L
= 8I + 68mH,
V
PVDD
= 5.0V
Z
L
= 8I + 68mH,
V
PVDD
= 3.6V
f
IN
= 1kHz,
THD+N = 10%
Z
L
= 8I + 68mH,
V
PVDD
= 4.2V
Z
L
= 8I + 68mH,
V
PVDD
= 5.0V
Z
SPK
= 8I + 68mH,
V
PVDD
= 3.6V
THD+N ≤ 1%
Output Power (MAX98308)
P
OUT
Z
SPK
= 8I + 68mH,
V
PVDD
= 4.2V
Z
SPK
= 8I + 68mH,
V
PVDD
= 5.0V
Z
SPK
= 8I + 68mH,
V
PVDD
= 3.6V
Z
SPK
= 8I + 68mH,
V
PVDD
= 4.2V
MIN
20
17
14
11
8
TYP
20.5
17.5
14.5
11.5
8.5
65
1.54
2
2.85
W
1.77
2.3
3.3
1.4
1.92
2.7
1.57
2.13
W
MAX
21
18
15
12
9
dB
dB
UNITS
Output Power (MAX98307)
P
OUT
THD+N ≤ 10%
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
4
MAX98307/MAX98308
3.3W Mono Class DG Multilevel Audio Amplifier
ELECTRICAL CHARACTERISTICS (continued)
V
PVDD
= V
CC
= V
SHDN
= 3.6V, V
PGND
= V
GND
= 0V, Z
L
= 8I + 68FH between OUT+ and OUT-, (MAX98307 R
IN+
= R
IN-
= 10kI,
R
FB+
= R
FB-
= 20kI), C
IN+
= C
IN-
= 0.33FF, A
V
= 14.5dB, AC measurement bandwidth 20Hz to 20kHz, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are at T
A
= +25NC.) (Notes 2, 3)
PARAMETER
Total Harmonic Distortion Plus
Noise
Output Offset Voltage
SYMBOL
THD+N
V
OS
CONDITIONS
f
IN
= 1kHz, P
OUT
= 1W
T
A
= +25°C
Peak voltage,
A-weighted,
32 samples per
second (Notes 4, 5)
Into shutdown
Out of shutdown
MIN
TYP
0.05
±1
-65
dBV
-65
340
η
I
LIM
V
N
V
IH
V
IL
T
A
= +25NC
A-weighted
1.4
0.4
±10
f
IN
= 1kHz, P
OUT
at 500mW,
THD+N = 0.02%
f
IN
= 1kHz, P
OUT
at 1W, THD+N = 0.05%
Current Limit
Output Noise
LOGIC INPUT (SHDN)
Input Voltage High
Input Voltage Low
Input Leakage Current
Note
Note
Note
Note
2:
3:
4:
5:
84
82
2
52
A
RMS
µV
RMS
V
V
µA
kHz
%
±5
MAX
UNITS
%
mV
Click-and-Pop Level
K
CP
Output Switching Frequency
Efficiency
100% production tested at T
A
= +25°C. Specifications over temperature limits are guaranteed by design.
Testing performed with a resistive load in series with an inductor to simulate an actual speaker. For R
L
= 8I, L = 68FH.
Amplifier inputs AC-coupled to GND.
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.
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
5
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