19-0701; Rev 0; 12/06
KIT
ATION
EVALU
BLE
AVAILA
2.4W, Single-Supply, Class G Power Amplifier
General Description
The MAX9730 features a mono Class G power amplifier
with an integrated inverting charge-pump power supply.
The charge pump can supply up to 500mA of peak out-
put current over a 2.7VDC to 5.5VDC supply voltage
range, guaranteeing up to 2.4W output power into an
8Ω load. The 2.4W output power allows for transient
audio content to remain unclipped as the battery rail col-
lapses over time.
The MAX9730 maximizes battery life by offering high-
performance efficiency. Maxim’s proprietary output
stage provides efficiency levels greater than Class AB
devices without the EMI penalties commonly associat-
ed with Class D amplifiers. High efficiency allows the
MAX9730 to be packaged in a UCSP™ package with-
out derating the output power handling capability.
The device utilizes fully differential inputs and outputs,
comprehensive click-and-pop suppression, shutdown
control, and soft-start circuitry. The MAX9730 is fully
specified over the -40°C to +85°C extended tempera-
ture range and is available in ultra-small, lead-free,
20-bump UCSP (2mm x 2.5mm) and 28-pin TQFN
(4mm x 4mm) packages.
o
2.7V to 5.5V Operation
o
Integrated Charge-Pump Power Supply
o
63% Efficiency (V
CC
= 5V, P
OUT
= 1W)
o
2.4W Output Power into 8Ω at V
CC
= 3.3V
o
Up to 2.4W Instantaneous Output Power into 8Ω
o
Clickless/Popless Operation
o
Small Thermally Efficient Packages
2mm x 2.5mm 20-Bump UCSP
4mm x 4mm 28-Pin TQFN
Features
MAX9730
Ordering Information
PART
MAX9730EBP+T*
MAX9730ETI
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
B20-7
T2844-1
-40°C to +85°C 20 UCSP-20
-40°C to +85°C 28 TQFN-EP**
Applications
MP3 Players
Personal Media Players
Handheld Gaming
Consoles
Cell Phones
Smartphones
Notebook Computers
+Denotes
lead-free package.
*Future
product—contact factory for availability.
**EP
= Exposed pad.
Typical Application Circuit/Functional Diagram and Pin
Configurations appear at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
Simplified Block Diagram
2.7V TO 5.5V
V
CC
FB+
CPV
DD
MAX9730
C
IN
R
IN+
R
FB+
IN+
IN-
C
IN
R
IN-
R
FB-
FB-
GND
CHARGE
PUMP
CPGND
+
-
CLASS G
OUTPUT
STAGE
OUT+
OUT-
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
2.4W, Single-Supply, Class G Power Amplifier
MAX9730
ABSOLUTE MAXIMUM RATINGS
(Voltages with respect to GND.)
V
CC
, CPV
DD
.............................................................-0.3V to +6V
PV
SS
, SV
SS
...............................................................-6V to +0.3V
CPGND..................................................................-0.3V to +0.3V
OUT+, OUT-...................................(SV
SS
- 0.3V) to (V
CC
+ 0.3V)
IN+, IN-, FB+, FB- ......................................-0.3V to (V
CC
+ 0.3V)
C1N..........................................(PV
SS
- 0.3V) to (CPGND + 0.3V)
C1P.......................................(CPGND - 0.3V) to (CPV
DD
+ 0.3V)
FS,
SHDN
...................................................-0.3V to (V
CC
+ 0.3V)
Continuous Current Into/Out of
OUT+, OUT-, V
CC
, GND, SV
SS
.....................................800mA
CPV
DD
, CPGND, C1P, C1N, PV
SS
.................................800mA
Any Other Pin ..................................................................20mA
Duration of OUT+, OUT- Short Circuit to
V
CC
, GND, CPV
DD
, CPGND ..................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
20-Bump UCSP (derate 10.3mW/°C above +70°C) .....827mW
28-Pin TQFN (derate 20.8mW/°C above +70°C) ........1667mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
Bump Temperature (soldering) Reflow............................+235°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
CC
= CPV
DD
=
SHDN
= 3.6V, GND = CPGND = 0V, R
IN+
= R
IN-
= 10kΩ, R
FB+
= R
FB-
= 10kΩ, R
FS
= 100kΩ, C1 = 4.7µF, C2 =
10µF; speaker load resistors (R
L
) are terminated between OUT+ and OUT-, unless otherwise stated; T
A
= T
MIN
to T
MAX
, unless other-
wise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
GENERAL
Supply Voltage Range
Quiescent Current
Chip Power Dissipation
Shutdown Current
Turn-On Time
Input DC Bias Voltage
Charge-Pump Oscillator
Frequency (Slow Mode)
Maximum Capacitive Load
SHDN
Input Threshold (Note 3)
SHDN
Input Leakage Current
SPEAKER AMPLIFIER
Output Offset Voltage
Common-Mode Rejection Ratio
Click-and-Pop Level
V
OS
CMRR
V
CP
T
A
= +25°C
T
MIN
≤
T
A
≤
T
MAX
f
IN
= 1kHz (Note 4)
Peak voltage into/out of shutdown
A-weighted, 32 samples per second
(Notes 5, 6)
68
-52
±3
±15
±20
mV
dB
dBV
V
CC
I
CC
P
DISS
I
SHDN
t
ON
V
BIAS
f
OSC
C
L
V
IH
V
IL
1.4
0.4
±1
V
OUT
= 2.8V
RMS
, f = 1kHz, R
L
= 8Ω
SHDN
= GND
Time from shutdown or power-on to full
operation
IN_ inputs
I
LOAD
= 0mA (slow mode)
I
LOAD
> 100mA (normal mode)
1.1
55
230
Inferred from PSRR test
2.7
8
0.9
0.3
50
1.24
83
330
200
1.4
110
430
pF
V
µA
5
5.5
12
V
mA
W
µA
ms
V
kHz
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
2.4W, Single-Supply, Class G Power Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= CPV
DD
=
SHDN
= 3.6V, GND = CPGND = 0V, R
IN+
= R
IN-
= 10kΩ, R
FB+
= R
FB-
= 10kΩ, R
FS
= 100kΩ, C1 = 4.7µF, C2 =
10µF; speaker load resistors (R
L
) are terminated between OUT+ and OUT-, unless otherwise stated; T
A
= T
MIN
to T
MAX
, unless other-
wise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
Voltage Gain
SYMBOL
A
V
(Notes 4, 7)
V
CC
= 5V
Continuous Output Power
P
OUT
THD+N = 1%, f = 1kHz,
R
L
= 8Ω
V
CC
= 4.2V
V
CC
= 3.6V
V
CC
= 3.0V
V
CC
= 5V
f = 1kHz, 1% THD+N,
Z
L
= 1µF + 10Ω
Output Voltage
V
OUT
f = 10kHz, 1% THD+N,
Z
L
= 1µF + 10Ω, no
load
V
CC
= 2.7V to 5.5V
Power-Supply Rejection Ratio
(Note 4)
f = 217Hz, 200mV
P-P
ripple
PSRR
f = 1kHz, 200mV
P-P
ripple
f = 20kHz, 200mV
P-P
ripple
Total Harmonic Distortion Plus
Noise
Signal-to-Noise Ratio
Dynamic Range
THD+N
SNR
DR
R
L
= 8Ω, V
OUT
= 1kHz / 400mW
R
L
= 8Ω, V
OUT
= 1kHz / 1W
V
OUT
= 0.5W, inputs to GND by C1N,
A-weighted
(Note 9)
22Hz to 22kHz
A-weighted
V
CC
= 4.2V
V
CC
= 3.6V
V
CC
= 3.0V
V
CC
= 5V
V
CC
= 4.2V
V
CC
= 3.6V
V
CC
= 3.0V
63
CONDITIONS
MIN
11.5
TYP
12
2.4
1.67
1.25
0.8
7.1
5.9
5.1
4.2
6.5
5.4
4.7
3.8
77
77
77
58
0.007
0.12
95
96
99
%
dB
dB
dB
W
V
RMS
MAX
12.5
UNITS
dB
MAX9730
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Testing performed with resistive and inductive loads to simulate an actual speaker load. For dynamic speakers,
R
L
= 8Ω, 68µH.
Designed for 1.8V logic.
R
IN_
and R
FB_
have 0.5% tolerance.
Amplifier inputs AC-coupled to GND.
Testing performed at room temperature with 8Ω resistive load in series with 68µH inductive load connected across BTL
output for speaker amplifier. Mode transitions are controlled by
SHDN.
V
CP
is the peak output transient expressed in dBV.
Voltage gain is defined as: [V
OUT+
- V
OUT-
] / [V
IN+
- V
IN-
].
Mode A tone burst tested at full amplitude for one cycle and half amplitude for nine cycles. Mode B tone burst tested at
full amplitude for three cycles and half amplitude for seven cycles. Full amplitude is defined as 1% THD+N at full battery
(V
CC
= 4.2V).
Electrical Characteristics
table targets must be met at THD+N = 1% for one cycle (Mode A) and THD+N <
5% for three cycles (Mode B).
Dynamic range is calculated by measuring the RMS voltage difference between a -60dBFS output signal and the noise
floor, then adding 60dB. Full scale is defined as the output signal needed to achieve 1% THD+N.
_______________________________________________________________________________________
3
2.4W, Single-Supply, Class G Power Amplifier
MAX9730
Typical Operating Characteristics
(V
CC
= CPV
DD
=
SHDN
= 3.6V, GND = CPGND = 0V, R
IN+
= R
IN-
= 10kΩ, R
FB+
= R
FB-
= 10kΩ, R
FS
= 100kΩ, C1 = 4.7µF, C2 =
10µF, R
L
= 8Ω; speaker load resistors (R
L
) are terminated between OUT+ and OUT-, unless otherwise stated; T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
V
CC
= 3V
1
THD+N (%)
MAX9730 toc01
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9730 toc02
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
V
CC
= 5V
1
THD+N (%)
P
OUT
= 2.08W
MAX9730 toc03
10
10
V
CC
= 3.6V
1
THD+N (%)
P
OUT
= 0.93W
10
P
OUT
= 0.69W
0.1
0.1
P
OUT
= 0.37W
0.01
0.1
0.01
P
OUT
= 0.33W
0.01
P
OUT
= 0.83W
0.001
0.01
0.1
1
FREQUENCY (kHz)
10
100
0.001
0.01
0.1
1
FREQUENCY (kHz)
10
100
0.001
0.01
0.1
1
FREQUENCY (kHz)
10
100
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9730 toc04
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
V
CC
= 3.6V
f
IN
= 10kHz
1
f
IN
= 1kHz
THD+N (%)
THD+N (%)
0.1
0.1
MAX9730 toc05
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
V
CC
= 5V
f
IN
= 10kHz
1
f
IN
= 1kHz
MAX9730 toc06
10
V
CC
= 3V
1
f
IN
= 1kHz
THD+N (%)
0.1
f
IN
= 10kHz
10
10
0.01
f
IN
= 20Hz
0.001
0
0.5
1.0
1.5
OUTPUT POWER (W)
0.01
f
IN
= 20Hz
0.01
f
IN
= 20Hz
0.001
0.001
0
0.5
1.0
OUTPUT POWER (W)
1.5
2.0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT POWER (W)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9730 toc07
POWER EFFICIENCY
vs. OUTPUT POWER
MAX9730 toc08
POWER EFFICIENCY
vs. OUTPUT POWER
MAX9730 toc09
0
-10
-20
-30
PSRR (dB)
-40
-50
-60
-70
-80
-90
0.01
0.1
1
FREQUENCY (kHz)
10
V
RIPPLE
= 200mV
P-P
70
60
50
EFFICIENCY (%)
40
30
20
10
0
V
CC
= 3V
f
IN
= 1kHz
0
0.5
1.0
70
60
50
EFFICIENCY (%)
40
30
20
10
0
V
CC
= 3.6V
f
IN
= 1kHz
0
0.5
1.0
100
1.5
1.5
OUTPUT POWER (W)
OUTPUT POWER (W)
4
_______________________________________________________________________________________
2.4W, Single-Supply, Class G Power Amplifier
Typical Operating Characteristics (continued)
(V
CC
= CPV
DD
=
SHDN
= 3.6V, GND = CPGND = 0V, R
IN+
= R
IN-
= 10kΩ, R
FB+
= R
FB-
= 10kΩ, R
FS
= 100kΩ, C1 = 4.7µF, C2 =
10µF, R
L
= 8Ω; speaker load resistors (R
L
) are terminated between OUT+ and OUT-, unless otherwise stated; T
A
= T
MIN
to T
MAX
,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
POWER EFFICIENCY
vs. OUTPUT POWER
MAX9730 toc10
MAX9730
STARTUP WAVEFORM
MAX9730 toc11
SHUTDOWN WAVEFORM
MAX9730 toc12
70
60
50
EFFICIENCY (%)
40
30
20
10
0
0
1
2
3
V
CC
= 5V
f
IN
= 1kHz
SHDN
5V/div
SHDN
5V/div
OUT+ - OUT-
500mV/div
OUT+ - OUT-
500mV/div
10ms/div
10ms/div
OUTPUT POWER (W)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9730 toc13
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
0.9
SHUTDOWN CURRENT (μA)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
MAX9730 toc14
12
10
SUPPLY CURRENT (mA)
8
6
4
2
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1.0
0
6.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9730 toc15
OUTPUT POWER
vs. LOAD RESISTANCE
f
IN
= 1kHz
P
OUT
AT 1% THD+N
MAX9730 toc16
4.0
3.5
OUTPUT POWER (W)
3.0
2.5
2.0
1.5
1.0
0.5
f
IN
= 1kHz
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1% THD+N
10% THD+N
3.0
2.5
OUTPUT POWER (W)
2.0
1.5
1.0
0.5
V
CC
= 3.6V
0
V
CC
= 5V
6.0
0
20
40
60
80
100
SUPPLY VOLTAGE (V)
LOAD RESISTANCE (Ω)
_______________________________________________________________________________________
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
