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MAX98300
Technical data
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MAXIM MAX98300 Technical data

19-5234; Rev 0; 7/10
EVALUATION KIT
AVAILABLE
Mono 2.6W Class D Amplifier
General Description
The MAX98300 mono 2.6W Class D amplifier provides Class AB audio performance with Class D efficiency. This device offers five selectable gain settings (0dB, 3dB, 6dB, 9dB, and 12dB) set by a single gain-select input (GAIN).
Active emissions-limiting edge-rate and overshoot con­trol circuitry greatly reduces EMI. A patented filterless spread-spectrum modulation scheme eliminates the need for output filtering found in traditional Class D devices. These features reduce application component count.
The MAX98300 industry-leading 0.78mA at 3.7V (1.1mA at 5V) quiescent current extends battery life in portable applications.
The MAX98300 is available in an 8-pin TDFN-EP (2mm x 2mm x 0.8mm) and a 9-bump (1.2mm x 1.2mm) WLP. Both packages are specified over the extended -40NC to +85NC temperature range.
MAX98300
Features
S Industry-Leading Quiescent Current: 0.78mA at
3.7V, 1.1mA at 5V
S Spread Spectrum and Active Emissions Limiting
S Five Selectable Gains
S Click-and-Pop Suppression
S Thermal and Overcurrent Protection
S Low-Current Shutdown Mode
S Space-Saving Packages
2mm x 2mm x 0.8mm, 8-Pin TDFN-EP
1.2mm x 1.2mm, 9-Bump WLP (0.4mm Pitch)
Applications
Notebook and Netbook Computers
Cellular Phones
MP3 Players
Portable Audio Players
VoIP Phones
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX98300ETA+ MAX98300EWL+
+Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad.
-40NC to +85NC
-40NC to +85NC
8 TDFN-EP* 9 WLP
Typical Application Circuit
+2.6V TO +5.5V
1µF
1µF
SHDN
GAIN
IN+
IN-
MAX98300
+2.6V TO +5.5V
PVDD
OUT+
OUT-
PGND
0.1µF
10µF*
*SYSTEM BULK CAPACITANCE
_______________________________________________________________ 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.
Mono 2.6W Class D Amplifier
ABSOLUTE MAXIMUM RATINGS
PVDD, IN+, IN-, SHDN, GAIN to PGND .................... -0.3V to 6V
All Other Pins to PGND .........................-0.3V to (V
PVDD
+ 0.3V) Continuous Current Into/Out of PVDD, PGND, OUT_ ... Q600mA
Continuous Input Current (all other pins) ........................ Q20mA
Duration of Short Circuit Between
OUT_ and PVDD, PGND .......................................Continuous
OUT+ and OUT- ....................................................Continuous
Continuous Power Dissipation (T
= +70NC) for Multilayer Board
A
TDFN-EP (derate 11.9mW/NC) .................................. 953.5mW
WLP (derate 12mW/NC) ............................................963.8mW
Junction Temperature .....................................................+150NC
Operating Temperature Range .......................... -40NC to +85NC
Storage Temperature Range ............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
MAX98300
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
PVDD
= V
SHDN
= 5.0V, V
= 0V, AV = 12dB (GAIN = PVDD), RL = J, RL connected between OUT+ to OUT-, AC measurement
PGND
= T
MIN
to T
A
, unless otherwise noted. Typical values are at TA = +25NC.) (Notes 1, 2)
MAX
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
AMPLIFIER CHARACTERISTICS
Speaker Supply Voltage Range PVDD Inferred from PSRR test 2.6 5.5 V
V
= 5.0V 1.1 2.0
Quiescent Supply Current I
Shutdown Supply Current I
SHDN
Turn-On Time t Bias Voltage V
Maximum AC Input Voltage Swing V
Input Resistance R
DD
ON
BIAS
IN
IN
PVDD
= 3.7V 0.78
V
PVDD
V
= 0V, TA = +25NC
SHDN
< 0.1 10
3.7 10 ms
1.3 V Differential 2.0 Single ended 1.0
A
= 12dB 10 20
V
= 9dB 10 20
A
V
= 6dB 10 20
A
TA = +25°C
V
= 3dB 15 28
A
V
= 0dB 26 40
A
V
Connect GAIN to PVDD 11.5 12 12.5
Voltage Gain A
Connect GAIN to PVDD through 100kI ±5%
GAIN unconnected 5.5 6 6.5
V
Connect GAIN to PGND through 100kI ±5%
8.5 9 9.5
2.5 3 3.5
Connect GAIN to PGND -0.5 0 +0.5
Output Offset Voltage V
Click and Pop K
OS
CP
Common-Mode Rejection Ratio CMRR f
TA = +25°C (Note 3)
Peak voltage,
Into shutdown -66
A-weighted, 32 samples per second, R
= 8I (Notes 3, 4)
L
= 1kHz, input referred 50 dB
IN
Out of shutdown -66
Q1 Q 3
(V bandwidth 20Hz to 22kHz, T
mA
FA
V
RMS
kI
dB
mV
dBV
2 ______________________________________________________________________________________
Mono 2.6W Class D Amplifier
ELECTRICAL CHARACTERISTICS (continued)
PVDD
= V
SHDN
= 5.0V, V
= 0V, AV = 12dB (GAIN = PVDD), RL = J, RL connected between OUT+ to OUT-, AC measurement
PGND
= T
MIN
to T
A
, unless otherwise noted. Typical values are at TA = +25NC.) (Notes 1, 2)
MAX
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Power-Supply Rejection Ratio (Note 3)
PSRR
V
= 2.6V to 5.5V, TA = +25NC
PVDD
RIPPLE
= 200mV
P-P
V
fIN = 1kHz, RL = 4I
f = 217Hz 67 f = 20kHz 63 THD+N = 1% 2.1 THD+N = 10% 2.6
50 70
THD+N = 1% 1.35
Output Power P
Total Harmonic Distortion Plus Noise
THD+N f
Oscillator Frequency f Spread-Spectrum Bandwidth Efficiency Noise V Output Current Limit I
OUT
OSC
E P
N
LIM
f
= 1kHz, RL = 8I
IN
= 1kHz
IN
= 1.3W, RL = 8I
OUT
AV = 0dB, A-weighted (Note 3) 36
THD+N = 10% 1.65
THD+N = 1%,
= 3.7V
V
PVDD
THD+N = 10%, V
= 3.7V
PVDD
= 4I
R
L
P
= 1W
OUT
R
= 8I
L
P
= 0.5W
OUT
0.71
0.89
0.05 %
0.04 %
300 kHz
±10
89 %
2 A Thermal Shutdown Level +160 Thermal Shutdown Hysteresis 20
DIGITAL INPUT (SHDN)
Input-Voltage High V Input-Voltage Low V Input Leakage Current
INH
INL
= +25NC Q10 FA
T
A
1.4 V
Note 1: All devices are 100% production tested at +25NC. All temperature limits are guaranteed by design. Note 2: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For R
L = 33FH. For RL = 8I, L = 68FH.
Note 3: Amplifier inputs AC-coupled to ground. Note 4: Mode transitions controlled by SHDN.
(V bandwidth 20Hz to 22kHz, T
kHz
FV
0.4 V
= 4I,
L
MAX98300
dB
W
RMS
NC NC
_______________________________________________________________________________________ 3
Mono 2.6W Class D Amplifier
Typical Operating Characteristics
(V
= V
PVDD
measurement bandwidth 20Hz to 22kHz, T
SHDN
= 5.0V, V
= 0V, AV = 12dB, RL = J, unless otherwise specified, RL connected between OUT+ to OUT-, AC
PGND
= +25NC, unless otherwise noted.)
A
10
RL = 4I + 33FH V
= 5.0V
PVDD
1
MAX98300
P
THD+N vs. FREQUENCY
0.1
THD+N (%)
0.01
0.001
0.01 100
10
1
0.1
THD+N (%)
0.01
= 1.2W
OUT
P
= 400mW
OUT
FREQUENCY (kHz)
THD+N vs. FREQUENCY
RL = 8I + 68FH V
= 3.7V
PVDD
P
= 100mW
OUT
10
RL = 4I + 33FH V
= 3.7V
MAX98300 toc01
1010.1
PVDD
1
P
0.1
THD+N (%)
0.01
0.001
0.01 100
OUT
P
OUT
= 800mW
= 200mW
FREQUENCY (kHz)
1010.1
MAX98300 toc02
10
1
0.1
THD+N (%)
0.01
0.001
0.01 100
THD+N vs. OUTPUT POWER
THD+N vs. FREQUENCY
MAX98300 toc04
100
10
1
THD+N (%)
0.1
RL = 4I + 33µH V
= 5.0V
PVDD
fIN = 1kHz
fIN = 6kHz
MAX98300 toc05
100
10
1
THD+N (%)
0.1
THD+N vs. FREQUENCY
RL = 8I + 68FH V
= 5.0V
PVDD
P
= 1.2W
OUT
P
= 150mW
OUT
FREQUENCY (kHz)
THD+N vs. OUTPUT POWER
RL = 4I + 33µH V
= 3.7V
PVDD
fIN = 6kHz
fIN = 1kHz
MAX98300 toc03
1010.1
MAX98300 toc06
P
= 600mW
OUT
0.001
0.01 100 FREQUENCY (kHz)
THD+N vs. OUTPUT POWER
100
RL = 8I + 68FH V
= 5.0V
PVDD
10
fIN = 6kHz
1
THD+N (%)
fIN = 1kHz
0.1
0.01
OUTPUT POWER (W)
1010.1
fIN = 100Hz
1.51.20.90.60.30 1.8
MAX98300 toc07
0.01 0 3.0
OUTPUT POWER (W)
THD+N vs. OUTPUT POWER
100
RL = 8I + 68FH V
= 3.7V
PVDD
10
fIN = 6kHz
1
THD+N (%)
fIN = 1kHz
0.1
0.01 0 1.0
OUTPUT POWER (W)
fIN = 100Hz
2.52.01.51.00.5
fIN = 100Hz
0.80.60.40.2
MAX98300 toc08
0.01
0.2 0.4 0.6 0.8 1.0 1.2 1.4
0 1.6
OUTPUT POWER (W)
EFFICIENCY vs. OUTPUT POWER
100
V
= 5.0V
PVDD
90
80
70
60
50
40
EFFICIENCY (%)
30
20
10
0
RL = 8I + 68FH
0 2.4
OUTPUT POWER (W)
4 ______________________________________________________________________________________
fIN = 100Hz
MAX98300 toc09
RL = 4I + 33FH
2.01.61.20.80.4
Mono 2.6W Class D Amplifier
Typical Operating Characteristics (continued)
(V
= V
PVDD
measurement bandwidth 20Hz to 22kHz, T
SHDN
= 5.0V, V
= 0V, AV = 12dB, RL = J, unless otherwise specified, RL connected between OUT+ to OUT-, AC
PGND
= +25NC, unless otherwise noted.)
A
MAX98300
EFFICIENCY vs. OUTPUT POWER
100
V
= 3.7V
PVDD
90
80
70
60
50
40
EFFICIENCY (%)
30
20
10
0
RL = 8I + 68FH
OUTPUT POWER (W)
OUTPUT POWER vs. SUPPLY VOLTAGE
3.00 RL = 4I + 33FH
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
OUTPUT POWER (W)
0.75
0.50
0.25
10% THD+N
1% THD+N
0
4.0
SUPPLY VOLTAGE (V)
COMMON-MODE REJECTION RATION vs.
0
INPUT REFERRED
-10
-20
-30
-40
-50
CMRR (dB)
-60
-70
-80
-90
0.01 100
RL = 4I + 33FH
1.21.00.6 0.80.40.20 1.4
5.0
4.53.53.02.5 5.5
FREQUENCY
FREQUENCY (kHz)
5.0
4.5
4.0
MAX98300 toc10
3.5
3.0
2.5
2.0
OUTPUT POWER (W)
1.5
1.0
0.5
3.00
2.75
2.50
MAX98300 toc13
2.25
2.00
1.75
1.50
1.25
1.00
OUTPUT POWER (W)
0.75
0.50
0.25
1010.1
OUTPUT POWER vs.
LOAD RESISTANCE
PVDD = 5V
10% THD+N
1% THD+N
0
1 1000
LOAD RESITANCE (I)
1001.0
OUTPUT POWER vs. SUPPLY VOLTAGE
RL = 4I + 68FH
10% THD+N
1% THD+N
0
4.0
SUPPLY VOLTAGE (V)
MAX98300 toc16
5.0
4.53.53.02.5 5.5
20
15
10
5
AMPLITUDE (dB)
0
-5
0.01 100
2.0
1.8
MAX98300 toc11
1.6
1.4
1.2
1.0
0.8
OUTPUT POWER (W)
0.6
0.4
0.2
0
1 1000
POWER-SUPPLY REJECTION RATIO vs.
0
V
RIPPLE
V
-10
MAX98300 toc14
PSRR (dB)
PVDD
-20
-30
-40
-50
-60
-70
-80
0.01 100
GAIN vs. FREQUENCY
AV = 12dB
AV = 9dB
AV = 6dB
AV = 3dB
AV = 0dB
FREQUENCY (kHz)
OUTPUT POWER vs.
LOAD RESISTANCE
PVDD = 3.7V
10% THD+N
1% THD+N
LOAD RESITANCE (I)
FREQUENCY
= 200mV
P-P
= 5.0V
FREQUENCY (kHz)
MAX98300 toc17
1010.1
MAX98300 toc12
1001.0
MAX98300 toc15
1010.1
_______________________________________________________________________________________ 5
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