MAX98309EWL+T [MAXIM]
Audio Amplifier, 2.7W, 1 Channel(s), 1 Func, PBGA9, WLP-9;
| 型号： | MAX98309EWL+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Audio Amplifier, 2.7W, 1 Channel(s), 1 Func, PBGA9, WLP-9 放大器 商用集成电路 |
| 文件： | 总14页 (文件大小：1828K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
����������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 1
19-5912; Rev 0; 6/11
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
S EnhancesꢀSystemꢀPerformance
The MAX98309/MAX98310 mono 1.4W class AB audio
amplifiers offer low quiescent current while maintaining
excellent SNR and low 0.008% THD+N. These ICs fea-
ture excellent 90dB PSRR and state of the art click-and-
pop suppression.
ꢀDifferentialꢀInputꢀImprovesꢀNoiseꢀImmunity
ꢀIndustry-LeadingꢀClick-and-PopꢀSuppression
ꢀHighꢀ90dBꢀPSRRꢀ(f ꢀ=ꢀ217Hz)
IN
S SmallerꢀSolutionꢀSize
ꢀ1mmꢀxꢀ1mmꢀWLPꢀFootprint
The ICs are offered with an internally fixed 0dB, 3dB,
6dB, and 9dB gain (MAX98310) or an externally set gain
(MAX98309) through external resistors.
S ExtendsꢀBatteryꢀLife
ꢀLowꢀQuiescentꢀCurrent
The MAX98309 feature a 10ms or 100ms pin-selectable
turn-on time, while the MAX98310 has a preset 5ms turn-
on time.
S DeliversꢀRobustꢀSystemꢀDesign
ꢀThermalꢀOverloadꢀProtection
ꢀShort-CircuitꢀProtection
The MAX98309/MAX98310 are available in a (1.0mm x
1.0mm) 9-bump, 0.3mm pitch WLP, and are specified over
the extended -40NC to +85NC temperature range.
S 1.2mAꢀSupplyꢀCurrentꢀ(V ꢀ=ꢀ3.7V)
DD
S 750mWꢀintoꢀ8Iꢀ(V ꢀ=ꢀ3.7V)
DD
S 2.5Vꢀtoꢀ5.5VꢀSupplyꢀOperation
Applications
S Pin-Selectable,ꢀInternally-FixedꢀGainꢀ(MAX98310)
S 1.8VꢀLogic-CompatibleꢀSHDNꢀInput
Cell Phones/Smartphones
Digital Cameras
GPS
Ordering Information appears at end of data sheet.
Portable Media Players
e-Readers
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX98309.related.
Tablets
Simplified Block Diagram
2.5V TO 5.5V
R
F
2.5V TO 5.5V
0.1µF
1µF
0.1µF
1µF
BIAS
BIAS
V
GAIN
DD
MAX98310
BIAS
BIAS
V
TON
R
F
DD
MAX98309
V
DD
C
C
C
C
IN
IN
R
R
R
IN
IN
IN
IN
OUT+
OUT-
OUT+
IN-
IN-
IN+
BIAS
BIAS
IN
IN
R
IN+
OUT-
GND
SHDN
GND
R
F
SHDN
GND
R
F
Forꢀpricing,ꢀdelivery,ꢀandꢀorderingꢀinformation,ꢀpleaseꢀcontactꢀMaximꢀDirectꢀatꢀ1-888-629-4642,ꢀ
orꢀvisitꢀMaxim’sꢀwebsiteꢀatꢀwww.maxim-ic.com.
����������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 2
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
ABSOLUTEꢀMAXIMUMꢀRATINGS
DD
V
to GND............................................................... -0.3V to 6V
OUT+ to OUT- Short Circuit Duration .......................Continuous
SHDN to GND ........................................................... -0.3V to 6V
Continuous Power Dissipation (T = +70NC)
A
All Other Pins to GND ...............................-0.3V to (V
Continuous Current
+ 0.3V)
WLP (derate 11.9mW/NC above +70NC)......................848mW
Junction Temperature .....................................................+150NC
Operating Temperature Range.......................... -40NC to +85NC
Storage Temperature Range............................ -65NC to +150NC
Soldering Temperature (reflow).......................................+260NC
DD
V
, GND, OUT_....................................................... Q750mA
DD
IN_, SHDN, BIAS, GAIN, TON......................................... Q20mA
OUT_ Short Circuit to GND or V Duration ............Continuous
DD
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.
PACKAGEꢀTHERMALꢀCHARACTERISTICS (Noteꢀ1)
WLP
Junction-to-Ambient Thermal Resistance (B )......... 94°C/W
JA
Junction-to-Case Thermal Resistance (B )...............41°C/W
JC
Noteꢀ1: 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.
ELECTRICALꢀCHARACTERISTICS
(V
= 3.7V, V
= 0V, SHDN = V , GAIN = V
(0dB), C
= 0.1µF, C = 0.47µF, no load: R = R = 10kI (MAX98309),
DD
GND
MAX.
DD
DD
BIAS
IN
IN
F
T
= T
to T
Typical values are at T = +25°C, unless otherwise noted.) (Note 2)
A
MIN
A
PARAMETER
SYMBOL
CONDITIONS
Guaranteed by PSRR test
falling
MIN
TYP
MAX
5.5
UNITS
Supply Voltage Range
Undervoltage Lockout
V
2.5
V
V
DD
UVLO
V
1.8
1.2
1.9
2
2.3
DD
V
V
= 3.7V
= 5V
DD
Quiescent Supply Current
Shutdown Supply Current
I
mA
SHDN = V
VDD
DD
1.8
3
DD
I
FA
V
= 0V, T = +25NC
A
VDD_SD
SHDN
TON = GND
10
22.8
MAX98309 shutdown to
full operation
TON = V
100
DD
Turn-On Time
t
ms
dB
ON
MAX98310 shutdown to full operation
GAIN = V
5.7
11.5
-0.25
2.75
0
3
+0.25
3.25
DD
GAIN = GND
Gain
A
MAX98310
MAX98310
V
GAIN = unconnected
GAIN = BIAS
5.75
6
9
6.25
9.25
8.75
0.80 x
GAIN = V
DD
V
DD
0.05 x
GAIN = GND
V
DD
Gain Selection Threshold
V
0.16 x
0.24 x
GAIN = unconnected
GAIN = BIAS
V
V
DD
DD
0.35 x
0.69 x
V
V
DD
DD
����������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 3
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
ELECTRICALꢀCHARACTERISTICSꢀ(continued)
(V
= 3.7V, V
= 0V, SHDN = V , GAIN = V
(0dB), C
= 0.1µF, C = 0.47µF, no load: R = R = 10kI(MAX98309), T
DD
GND
DD
DD
BIAS
IN
IN
F
A
= T
to T
Typical values are at T = +25°C, unless otherwise noted.) (Note 2)
MIN
MAX. A
PARAMETER
SYMBOL
CONDITIONS
MAX98309, SHDN = V
MIN
TYP
MAX
UNITS
1000
38.2
31.7
25.5
DD
GAIN = 0dB
Differential Input Resistance
R
I
kI
INDIFF
MAX98310
GAIN = 3dB
GAIN = 6dB
Input Bias Current
Q1
+5
Q1
FA
FA
mV
MAX98309/MAX98310, SHDN = V
INBIAS
DD
I
INBIAS_
SHDN
Shutdown Input Bias Current
Output Offset Voltage
-5
SHDN = GND, IN_ = V
or IN_ = GND
DD
V
T
= +25NC (Note 3)
A
Q0.2
OS
Into shutdown
-66
R
= 8I, 32 samples per
L
Click-and-Pop Level
K
second, A-weighted,
dBV
CP
T
= +25NC (Notes 3, 4)
A
Out of shutdown
-66
0.475
0.5 x
0.525
Common-Mode Bias Voltage
V
Voltage at BIAS
V
V
BIAS
x V
V
x V
DD
DD
DD
Input Common-Mode Voltage
Range
V
-
DD
V
Inferred from CMRR test
0.5
CM
0.6
Guaranteed over
input common-
mode voltage
range
-50
73
-76
-62
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
CMRR
PSRR
MAX98310/MAX98310
DC 2.5V to 5.5V
dB
dB
f
= 1kHz,
IN
R
= 8I + 33FH
L
93
90
f
f
f
= 217Hz
IN
IN
IN
V
= 200mV
P-P
RIPPLE
= 1kHz
90
(Note 3)
= 10kHz
72
R
R
R
R
R
R
= 8I + 68FH
= 4I + 33FH
= 8I + 68FH
= 4I + 33FH
= 8I + 68FH
= 4I + 33FH,
0.750
1.2
0.9
1.5
1.4
L
L
L
L
L
L
V
V
V
= 3.7V, 1% THD+N
= 3.7V, 10% THD+N
= 5V, 1% THD+N
DD
DD
DD
Output Power
P
W
OUT
(Note 5)
2.1
1.7
2.7
thermally limited
R
= 8I + 68FH
L
L
V
= 5V, 10% THD+N
DD
R
= 4I + 33FH,
(Note 5)
thermally limited
����������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 4
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
ELECTRICALꢀCHARACTERISTICSꢀ(continued)
(V
= 3.7V, V
= 0V, SHDN = V , GAIN = V
(0dB), C
= 0.1µF, C = 0.47µF, no load: R = R = 10kI (MAX98309),
DD
GND
MAX.
DD
DD
BIAS
IN
IN
F
T
= T
to T
Typical values are at T = +25°C, unless otherwise noted.) (Note 2)
A
MIN
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
R
= 8I + 68FH,
L
0.008
P
= 375mW
f
= 1kHz, BW = 22Hz to
OUT
IN
22kHz
Total Harmonic Distortion Plus
Noise
R
= 4I + 33FH,
L
THD+N
0.06
0.02
0.01
%
P
= 750mW
OUT
f
= 6kHz, BW = 22Hz to
R
= 8I + 68FH,
IN
L
22kHz
P
= 375mW
OUT
A-weighted, V
= 5V, P
= 1.4W,
DD
OUT
Signal-to-Noise Ratio
Output Noise Voltage
SNR
110
9
dB
FV
A
R
= 8I + 33FH
L
V
A-weighted (Note 3)
N
Overcurrent Protection
Threshold
2
Thermal-Protection Threshold
+160
15
NC
NC
Thermal-Protection Hysteresis
Maximum Capacitive Load
Drive
C
Bridge-tied load capacitance
500
pF
L
LOGICꢀINPUTꢀ(SHDN,ꢀTON)ꢀꢀ(MAX98309)
Input Logic-High
V
1.8V logic compliant
1.8V logic compliant
1.4
V
V
IH
Input Logic-Low
V
0.4
1
IL
Input Leakage Current High
Input Leakage Current Low
I
T
T
= +25NC
= +25NC
FA
FA
IH
A
A
I
1
IL
Noteꢀ2: All specifications are 100% tested at T = +25°C; temperature limits are guaranteed by design.
A
Noteꢀ3: Inputs AC-coupled to GND.
Noteꢀ4: Mode transitions controlled by SHDN.
Noteꢀ5: Thermally limited by package.
����������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 5
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
Typical Operating Characteristics
(V
= 3.7V, V
= 0V, SHDN = V , GAIN = GND (R = R = 10kI), C
= 0.1µF, C = 1µF, no load, unless otherwise noted.)
DD
GND
DD
F
IN
BIAS IN
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
10
100
10
100
10
V
= 4.2V
V
= 5V
V
= 3.7V
DD
DD
R = 4I
DD
R = 8I
R = 4I
L
L
L
1
0.1
1
1
P
= 300mW
OUT
P
= 1.2W
OUT
P
= 800mW
OUT
P
= 200mW
0.1
0.1
OUT
0.01
0.001
0.01
0.001
0.01
0.001
P
= 50mW
OUT
P
= 50mW
OUT
10
100
1k
FREQUENCY (kHz)
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
100
10
100
10
100
10
V
= 3.7V
V
= 4.2V
V
= 5V
DD
R = 8I
DD
R = 4I
DD
R = 8I
L
L
L
f
IN
= 6kHz
1
1
1
f
= 6kHz
IN
f
IN
= 300Hz
f
IN
= 300Hz
0.1
0.1
0.1
P
= 500mW
OUT
P
= 50mW
OUT
0.01
0.001
0.01
0.001
0.01
0.001
f
IN
= 1kHz
f
= 1kHz
IN
10
100
1k
FREQUENCY (Hz)
10k
100k
0
500
1000
1500
2000
0
250 500 750 1000 1250 1500 1750
OUTPUT POWER (mW)
OUTPUT POWER (mW)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
100
10
100
10
V
R
= 3.7V
= 4I
V
R
= 3.7V
DD
= 8I
L
DD
L
1
1
f
IN
= 300Hz
f
= 6kHz
IN
0.1
0.1
0.01
f
= 6kHz
IN
f
= 300Hz
IN
0.01
0.001
f
IN
= 1kHz
600
f
= 1kHz
IN
0.001
0
400
800
1200
1600
0
200
400
800
1000
OUTPUT POWER (mW)
OUTPUT POWER (mW)
����������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 6
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
Typical Operating Characteristics (continued)
(V
= 3.7V, V
= 0V, SHDN = V , GAIN = GND (R = R = 10kI), C = 0.1µF, C = 1µF, no load, unless otherwise noted.)
BIAS IN
DD
GND
DD
F
IN
OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
5
4
4
V
= 5V
V = 3.7V
DD
RL = 8I
DD
3
2
RL = 8I
3
2
1
1
0
0
-1
-2
-3
-4
-5
-1
-2
-3
-4
0
1
2
3
4
5
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
COMMON-MODE VOLTAGE (V)
COMMON-MODE VOLTAGE (V)
OUTPUT POWER vs. SUPPLY VOLTAGE
OUTPUT POWER vs. SUPPLY VOLTAGE
2500
2000
1500
1000
500
3500
3000
2500
2000
1500
1000
500
f
= 1kHz
f
= 1kHz
IN
L
IN
R = 4I
R = 8I
L
THD+N = 10%
THD+N = 10%
THERMALLY
LIMITED
THD+N = 10%
THD+N = 1%
4.0
0
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.5
5.0
5.5
SUPPLY VOLATGE (V)
SUPPLY VOLATGE (V)
OUTPUT POWER vs. LOAD
OUTPUT POWER vs. LOAD
3.0
2.5
2.0
1.5
1.0
0.5
0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
V
= 5V
DD
= 1kHz
V
= 3.7V
f = 1kHz
IN
DD
f
IN
= LOAD + 68µH
Z
LOAD
Z
= LOAD + 68µH
LOAD
THERMALLY
LIMITED
THD+N = 10%
THD+N = 1%
THD+N = 10%
THD+N = 1%
1
10
100
1k
1
10
100
1k
LOAD RESISTANCE (I)
LOAD RESISTANCE (I)
����������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 7
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
Typical Operating Characteristics (continued)
(V
= 3.7V, V
= 0V, SHDN = V , GAIN = GND (R = R = 10kI), C = 0.1µF, C = 1µF, no load, unless otherwise noted.)
BIAS IN
DD
GND
DD
F
IN
POWER DISSIPATION
vs. OUTPUT POWER
POWER DISSIPATION
vs. OUTPUT POWER
GAIN vs. FREQUENCY
(MAX98310)
1400
800
700
600
500
400
300
200
100
0
12
11
10
V
= 5V
DD
= 1kHz
f
A
A
A
A
= 9dB
= 6dB
= 3dB
= 0dB
IN
+ P
V
V
V
V
1200
1000
800
600
400
200
0
9
8
P
= P
OUTL
OUT
OUTR
7
R = 4I
L
6
R = 4I
L
R = 8I
L
5
4
3
2
1
0
R = 8I
L
-1
-2
-3
-4
-5
V
= 3.7V
= 1kHz
+ P
DD
f
IN
P
= P
OUT
OUTL OUTR
0
500
1000
1500
2000
0
300
600
900
1200
1500
10
100
1k
10k
100k
1000k
OUTPUT POWER (mW)
OUTPUT POWER (mW)
FREQUENCY (Hz)
PSRR vs. FREQUENCY
(MAX98309)
PSRR vs. FREQUENCY
(MAX98310)
0
-10
-20
-30
-40
-50
-60
-70
0
-10
R = 8I
R = 8I
L
L
V
= 200mV
V
= 200mV
RIPPLE
RIPPLE
-20
-30
-40
-50
V
= 5V
DD
-60
-80
-90
-70
V
DD
= 3.7V
-80
-100
-110
-120
-130
-140
-90
V
= 3.7V
DD
-100
-110
-120
V
= 5V
10k
DD
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
FREQUENCY (Hz)
100k
CMRR vs. FREQUENCY
(MAX98309)
CMRR vs. FREQUENCY
(MAX98310)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
R = 8I
THD + N = 1%
R = 8I
L
THD + N = 1%
L
V
DD
= 3.7V
V
DD
= 3.7V
V
= 5V
DD
V
= 5V
DD
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
����������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 8
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
Typical Operating Characteristics (continued)
(V
= 3.7V, V
= 0V, SHDN = V , GAIN = GND (R = R = 10kI), C
= 0.1µF, C = 1µF, no load, unless otherwise noted.)
DD
GND
DD
F
IN
BIAS IN
TURN-ON TIME (MAX98309) 10ms
TURN-ON TIME (MAX98309) 100ms
TURN-ON TIME MAX98310
MAX98309 toc24
MAX98309 toc22
MAX98309 toc23
2ms/div
20ms/div
1ms/div
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
3.0
2.5
2.0
1.5
1.0
0.5
0
2.5
V
= 5V
DD
2.0
1.5
1.0
0.5
0
V
= 3.7V
DD
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
SHUTDOWN CURRENT
vs. TEMPERATURE
9
8
7
6
5
4
3
2
1
0
10
9
8
7
6
5
4
3
2
1
0
V
= 5V
DD
V
= 3.7V
DD
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
����������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 9
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
Pin Configurations
TOP VIEW
(BUMP SIDE DOWN)
TOP VIEW
(BUMP SIDE DOWN)
MAX98309
MAX98310
1
2
3
1
2
3
+
+
OUT+
SHDN
TON
IN-
OUT+
SHDN
GAIN
IN-
A
B
C
A
B
C
GND
V
DD
GND
V
DD
OUT-
BIAS
IN+
OUT-
BIAS
IN+
WLP
WLP
Pin Descriptions
PIN
NAME
OUT+
SHDN
FUNCTION
MAX98309
MAX98310
A1
A1
Amplifier Positive Output
Active-Low Shutdown Input. Connect to GND to place the IC into shutdown. Connect
to V for normal operation.
A2
A2
DD
A3
B1
A3
B1
IN-
Inverting Audio Input
GND
Ground
Turn-On Time Selection. Connect TON to GND for a 10ms turn-on time. Connect TON
B2
—
TON
to V
for a 100ms turn on time.
DD
—
B3
C1
C2
C3
B2
B3
C1
C2
C3
GAIN
Gain Select Input. See Table 1 for gain settings.
Power Supply Input. Connect a 1FF capacitor from V
Amplifier Negative Output
V
to GND.
DD
DD
OUT-
BIAS
IN+
Common-Mode DC Bias Bypass. Connect a 0.1FF (min) capacitor to GND.
Noninverting Audio Input
���������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 10
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
Detailed Description
Applications Information
The MAX98309/MAX98310 mono 1.4W Class AB audio
amplifiers offer low quiescent current while maintaining
excellent SNR and low 0.008% THD+N. Both ICs feature
excellent 90dB PSRR and state-of-the-art click-and-pop
suppression.
BTL Amplifier
The ICs are designed to drive a load differentially, a
configuration referred to as bridge-tied load, or BTL. The
BTL configuration (Figure 1) offers advantages over the
single-ended configuration, where one side of the load
is connected to ground. Driving the load differentially
doubles the output voltage compared to a single-ended
amplifier under similar conditions.
The ICs are offered with an internally fixed 0dB, 3dB,
6dB, and 9dB gain (MAX98310) or an externally set gain
(MAX98309) through external resistors.
Substituting 2 x V
equations yields four times the output power due to
doubling of the output voltage:
for V
into the following
The MAX98309 features a 10ms or 100ms pin-selectable
turn-on time, while the MAX98310 has a preset 5ms turn-
on time.
OUT(P-P)
OUT(P-P)
V
Bias
The ICs operate from a single 2.5V to 5.5V power supply
and feature an internally generated common-mode bias
OUT (P−P)
V
=
=
RMS
2 2
2
V
RMS
P
voltage of V /2 reference to ground. BIAS provides both
OUT
DD
R
L
click-and-pop suppression and sets the DC bias level
for the audio outputs. Choose the value of the bypass
capacitor as described in the BIAS Capacitor section. Do
not connect external loads to BIAS as this can affect the
overall performance.
Because the differential outputs are biased at midsupply,
there is no net DC voltage across the load. This elimi-
nates the need for DC-blocking capacitors required for
single-ended amplifiers. These capacitors can be large,
expensive, consume board space, and degrade low-
frequency performance.
Turn-On Time
The MAX98309 external gain amplifier features a select-
able turn-on time for optimized click-and-pop perfor-
mance. Connect TON to GND for a 10ms turn-on time.
Power Dissipation and Heatsinking
Under normal operating conditions, the ICs dissipate a
significant amount of power. The maximum power dissi-
pation is given in the Absolute Maximum Ratings or can
be calculated by the following equation:
Connect TON to V
MAX98310 has a preset 5ms turn-on time.
for a 100ms turn-on time. The
DD
Shutdown Mode
T
− T
A
The ICs feature a 1.8FA low-power shutdown mode
that reduces quiescent current consumption. When the
active-low shutdown mode is entered, the ICs’ internal
bias circuitry is disabled, the amplifier outputs go high
impedance, and BIAS is driven to GND.
J(MAX)
P
=
D(MAX)
θ
JA
where T
is +150NC, T is the ambient temperature,
A
and B is the reciprocal of the derating factor in C/W as
specified in the Absolute Maximum Ratings.
J(MAX)
JA
Click-and-Pop Suppression
The ICs feature Maxim’s industry-leading click-and-
pop suppression circuitry. During startup, the amplifier
common-mode bias voltage ramps to the DC bias point.
When entering shutdown, the amplifier outputs are high
impedance between both outputs. This scheme mini-
mizes the energy present in the audio band.
+1
V
OUT(P-P)
2 x V
V
OUT(P-P)
-1
OUT(P-P)
Figure 1. BTL Configuration
���������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 11
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
The increase in power delivered by the BTL configuration
directly results in an increase in internal power dissipa-
tion over the single-ended configuration. The maximum
Input Filter
The fully differential amplifier inputs can be biased at
voltages other than midsupply. The common-mode
feedback circuit adjusts for input bias, ensuring the out-
puts are still biased at midsupply. Input capacitors are
not required as long as the input voltage is within the
specified common-mode range listed in the Electrical
Characteristics table.
internal power dissipation for a given V
given by the following equation:
and load is
DD
2V
2
DD
P
=
D(MAX)
2
π R
L
If the internal power dissipation for a given application
exceeds the maximum allowed for a given package,
reduce power dissipation by increasing the ground plane
heatsinking capability and the size of the traces to the
device. See the Layout and Grounding section. Other
methods for reducing power dissipation are to reduce
If input capacitors are used, input capacitor C , in con-
IN
junction with the input resistor R , forms a highpass filter
IN
that removes the DC bias from an incoming signal. The
AC-coupling capacitor allows the amplifier to bias the sig-
nal to an optimum DC level. Assuming zero-source imped-
ance, the -3dB point of the highpass filter is given by:
V
, increase load impedance, decrease ambient
DD
temperature, reduce gain, or reduce input signal.
1
f
=
−3dB
2πR
C
Thermal-overload protection limits total power dissipation
in the MAX98309/MAX98310. When the junction temper-
ature exceeds +160NC, the thermal protection circuitry
disables the amplifier. Operation returns to normal once
the die cools by 15NC.
IN IN
Setting f
too high affects the low-frequency response
-3dB
of the amplifier. Use capacitors with adequately low volt-
age coefficients, such as X7R ceramic capacitors with a
high voltage rating. Capacitors with higher voltage coef-
ficients result in increased distortion at low frequencies.
Amplifier Gain
Fixed Differential Gain (MAX98310)
The MAX98310 features four internally fixed differential
gain options selectable by GAIN (Table 1). This simplifies
design, decreases required application footprint size, and
eliminates external gain-setting resistors.
BIAS Capacitor
BIAS is the output of the internally generated V /2 bias
DD
, improves
voltage. The BIAS bypass capacitor, C
BIAS
PSRR and THD+N by reducing power supply and other
noise sources at the common-mode bias node, and also
generates the clickless/popless startup DC bias wave-
form for the speaker amplifiers. Bypass BIAS with a 0.1FF
External Differential Gain (MAX98309)
The MAX98309 features an external gain option. Resistors
R and R . See the Simplified Block Diagram and set the
capacitor to GND. Larger values of C
improve PSRR.
(up to 1FF)
BIAS
F
IN
gain of the amplifier as follows:
R
Supply Bypassing
Proper power-supply bypassing ensures low-noise, low-
distortion performance. Connect a 1FF ceramic capacitor
F
A
=
V
R
IN
where A is the desired voltage gain. Hence, an R of
10kI and an R of 20kI yields a gain of 2V/V or 6dB.
R can be either fixed or variable, allowing the use of a
digitally controlled potentiometer to alter the gain under
software control.
V
IN
from V
to GND. Add additional bulk capacitance as
DD
F
required by the application. Locate the bypass capacitor
as close as possible to the device.
F
Layout and Grounding
Good PCB layout is essential for optimizing performance.
Use large traces for the power-supply inputs and amplifier
outputs to minimize losses due to parasitic trace resis-
tance and route heat away from the device. Good ground-
ing improves audio performance, and prevents any digital
switching noise from coupling into the audio signal.
Tableꢀ1.ꢀFixedꢀDifferentialꢀGain
GAINꢀCONNECTION
GAINꢀ(dB)
V
0
3
6
9
DD
GND
Unconnected
BIAS
���������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 12
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
Ordering Information
PART
TEMPꢀRANGE
-40NC to +85NC
-40NC to +85NC
GAIN
External
Fixed
PIN-PACKAGE
9 WLP
TOPꢀMARK
+AIY
MAX98309EWL+
MAX98310EWL+
9 WLP
+AIZ
+Denotes a lead(Pb)-free/RoHS-compliant package.
���������������������������������������������������������������� ꢀMaxim Integrated Productsꢀ ꢀ 13
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
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.
PACKAGEꢀTYPE
PACKAGEꢀCODE
OUTLINEꢀNO.
21-0486
LANDꢀPATTERNꢀNO.
9 WLP (0.3mm pitch)
W91D1+1
Refer to ApplicationꢀNoteꢀ1891
COMMON DIMENSIONS
0.64
0.16
0.48
0.025
0.21
0.60
0.60
0.30
A
A1
A2
A3
b
0.05
0.03
MARKING
A3
PIN 1
INDICATOR
E
REF
BASIC
0.03
1
A1
A2
A
A
BASIC
BASIC
BASIC
D1
E1
e
0.05
S
S
D
AAAA
See
Note 7
SD
0.00 BASIC
0.00 BASIC
TOP VIEW
SIDE VIEW
SE
E
D
DEPOPULATED
BUMPS
MAX
0.98
MIN
MIN
MAX
0.98
PKG. CODE
W91D1+1
NONE
0.95
0.95
E1
e
SE
NOTES:
SD
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.
B
C
4. Marking shown is for package orientation reference only.
5. Tolerance is ± 0.02 unless specified otherwise.
B
D1
A
6. All dimensions apply to PbFree (+) package codes only.
7. Front - side finish can be either Black or Clear.
1
2
3
b
A
BOTTOM VIEW
TITLE
PACKAGE OUTLINE
9 BUMPS, WLP PKG. 0.3mm PITCH
REV.
APPROVAL
DOCUMENT CONTROL NO.
-DRAWING NOT TO SCALE-
1
1
21-0486
B
MAX98309/MAX98310
Mono 1.4W Class AB Audio Amplifiers
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
6/11
Initial release
—
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
14
©
2011 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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