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19-2338; Rev 4; 11/05
330mW, Ultra-Small, Audio Power Amplifiers
with Shutdown
General Description
The MAX4366/MAX4367/MAX4368 are bridged audio
power amplifiers intended for devices with internal
speakers and headsets. The MAX4366/MAX4367/
MAX4368 are capable of delivering 330mW of continu-
ous power into a 32Ω load, or 200mW into a 16Ω load
with 1% THD+N from a single 5V supply.
The MAX4366/MAX4367/MAX4368 bridged outputs elimi-
nate the need for output-coupling capacitors minimizing
external component count. The MAX4366/MAX4367/
MAX4368 also feature a low-power shutdown mode,
clickless power-up/power-down and internal DC bias
generation. The MAX4366 is a unity-gain stable, program-
mable gain amplifier. The MAX4367/MAX4368 feature
internally preset gains of 2V/V and 3V/V, respectively.
All devices are available in space-saving 8-pin SOT23,
TDFN, and µMAX
®
packages, and an 8-bump chip-
scale package (UCSP™).
Features
♦
Drives 330mW into 32Ω (200mW into 16Ω)
♦
0.02% THD+N at 1kHz (120mW into 32Ω)
♦
Internal Bridged Configuration
♦
♦
♦
♦
♦
No Output-Coupling Capacitors
2.3V to 5.5V Single-Supply Operation
2mA Supply Current
Low-Power Shutdown Mode
Clickless Power-Up and Shutdown
MAX4366/MAX4367/MAX4368
♦
Thermal Overload Protection
♦
Available in SOT23, TDFN, µMAX, and UCSP
Packages
Ordering Information
PART
TEMP RANGE
PIN/BUMP-
PACKAGE
8 UCSP-8
8 SOT23-8
8 µMAX
8 TDFN-8-EP*
8 TDFN-8-EP*
TOP
MARK
AAK
AAIO
—
AFZ
+AFZ
Applications
Cellular Phones
Two-Way Radios
PDAs
Headphones
Headsets
General-Purpose Audio
MAX4366EBL-T
-40°C to +85°C
MAX4366EKA-T -40°C to +85°C
MAX4366EUA
-40°C to +85°C
MAX4366ETA-T -40°C to +85°C
MAX4366ETA+T -40°C to +85°C
*EP
= Exposed paddle.
+Denotes
lead-free package.
Ordering Information continued at end of data sheet.
Selector Guide and Functional Diagrams appear at end of
data sheet.
Pin Configurations
TOP VIEW
(BUMP SIDE
DOWN)
1
A
IN-
OUT+
IN+
2
3
Typical Operating Circuit
V
CC
V
CC
BIAS
CLICKLESS/POPLESS
SHUTDOWNCONTROL
SHDN
OUT-
B
GND
MAX4366
MAX4367
MAX4368
V
CC
IN+
C
BIAS
OUT-
SHDN
AUDIO
INPUT
OUT+
IN-
UCSP
MAX4367
MAX4368
GND
Pin Configurations continued at end of data sheet.
UCSP is a trademark and µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________
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.
330mW, Ultra-Small, Audio Power Amplifiers
with Shutdown
MAX4366/MAX4367/MAX4368
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ..............................................................-0.3V to +6V
IN+, IN-, BIAS, SHDN to GND....................-0.3V to (V
CC
+ 0.3V)
Output Short Circuit to V
CC
or GND (Note 1).............Continuous
Output Short Circuit (OUT+ to OUT-) (Note 1)...........Continuous
Continuous Power Dissipation (T
A
= +70°C)
8-Bump UCSP (derate 4.7mW/°C above +70°C)..........379mW
8-Pin SOT23 (derate 9.7mW/°C above +70°C).............777mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW
8-Pin TDFN (derate 24.4mW°C above +70°C) ...........1951mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Bump Temperature (soldering) (Note 2)
Infrared (15s) ................................................................+220°C
Vapor Phase (60s) ........................................................+215°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
= 5V, R
L
=
∞,
R
IN
= R
F
= 30kΩ, C
BIAS
= 1µF to GND, SHDN = GND, IN+ = BIAS, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
Supply Voltage Range
Supply Current
Shutdown Supply Current
SHDN Threshold
SHDN Input Bias Current
Common-Mode Bias Voltage
V
BIAS
(Note 5)
MAX4366, R
IN
=
∞
Output Offset Voltage
V
OS
MAX4367, IN- = open
MAX4368, IN- = open
MAX4366 (open loop)
Differential Voltage Gain
A
V
(Note 6)
MAX4367 (internally set)
MAX4368 (internally set)
Input Common-Mode Range
Differential Input Resistance
Input Resistance
Power-Supply Rejection Ratio
Common-Mode Rejection Ratio
PSRR
CMRR
V
CM
R
IN(DIFF)
MAX4366, V
IN+
- V
IN-
= 10mV
V
IN
- = 0V to V
CC
(MAX4367/MAX4368)
V
CC
= 2.3V to
5.5V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
70
66
80
±87
±125
mA
±115
60
120
200
mW
R
L
= 32Ω
330
0.3
500
20
80
±5
V
CC
/2
- 5%
SYMBOL
V
CC
I
CC
I
SHDN
V
IH
V
IL
-400
V
CC
/2
±5
±5
±7.5
100
2
3
V
CC
-
1.0
V
CC
/2
+ 5%
±15
±15
±15
dB
V/V
V
kΩ
kΩ
dB
dB
mV
(Note 4)
SHDN = V
CC
1.8
0.8
CONDITIONS
Inferred from PSRR test
MIN
2.3
2
35
TYP
MAX
5.5
4.3
100
UNITS
V
mA
µA
V
nA
V
0V
≤
V
CM
≤
V
CC
- 1.0V (MAX4366)
2.7V
≤
V
CC
≤
5.5V,
0.6V
≤
V
OUT
≤
V
CC
- 0.6V
2.3V
≤
V
CC
≤
2.7V,
0.6V
≤
V
OUT
≤
V
CC
- 0.6V
Output Source/Sink Current
I
OUT
(Note 7)
Output Power
P
O
f = 1kHz,
THD+N <1%
(Note 8)
R
L
= 16Ω
2
_______________________________________________________________________________________
330mW, Ultra-Small, Audio Power Amplifiers
with Shutdown
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V, R
L
=
∞,
R
IN
= R
F
= 30kΩ, C
BIAS
= 1µF to GND, SHDN = GND, IN+ = BIAS, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
Total Harmonic Distortion Plus
Noise
Noise
Short-Circuit Current
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Power-Up Time
Shutdown Time
Enable Time from Shutdown
t
PU
t
SHDN
t
ENABLE
I
SC
SYMBOL
THD+N
CONDITIONS
A
V
= -2V/V, f = 1kHz
(MAX4366)
(Notes 9 and 10)
P
O
= 60mW, R
L
= 16Ω
P
O
= 120mW, R
L
= 32Ω
MIN
TYP
0.04
%
0.02
20
185
215
165
10
60
20
60
0.15
nV/√Hz
mA
°C
°C
ms
ms
ms
MAX
UNITS
MAX4366/MAX4367/MAX4368
f = 10kHz, referred to input
To V
CC
To GND
Note 1:
Continuous power dissipation must also be observed.
Note 2:
This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recom-
mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.
Preheating is required. Hand or wave soldering is not allowed.
Note 3:
All specifications are 100% tested at T
A
= +25°C; temperature limits are guaranteed by design.
Note 4:
Quiescent power-supply current is specified and tested with no load on the outputs. Quiescent power-supply current
depends on the offset voltage when a practical load is connected to the amplifier.
Note 5:
Common-mode bias voltage is the voltage on BIAS and is nominally V
CC
/2.
Note 6:
Differential voltage gain for the MAX4366 is specified as an open-loop parameter because external resistors are used to set
the closed-loop gain. The MAX4367/MAX4368 contain internal feedback resistors that preset the differential voltage gain.
Differential voltage gain is defined as (V
OUT+
- V
OUT-
) / (V
IN
- V
BIAS
). All gains are specified over an output voltage range of
0.6V
≤
V
OUT
≤
4.4V.
Note 7:
Specification applies to either output. An amplifier peak output current of 87mA is required to support an output load power
of 60mW for a 16Ω load, or 120mW for a 32Ω load.
Note 8:
Output power specifications are inferred from the output current test. For 60mW into a 16Ω load, I
OUT(PEAK)
is 87mA and
V
OUT(P-P)
is 1.39V per amplifier. For 120mW into a 32Ω load, I
OUT(PEAK)
is 87mA and V
OUT(P-P)
is 2.77V per amplifier.
Note 9:
Guaranteed by design. Not production tested.
Note 10:
Measurement bandwidth for THD+N is 20Hz to 20kHz.
Note 11:
Power-up and shutdown times are for the output to reach 90% of full scale with C
BIAS
= 1µF.
_______________________________________________________________________________________
3
330mW, Ultra-Small, Audio Power Amplifiers
with Shutdown
MAX4366/MAX4367/MAX4368
Typical Operating Characteristics
(Bridge-Tied Load, THD+N Bandwidth = 22Hz to 22kHz, C
BIAS
= 1µF.)
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
V
CC
= 5V
A
V
= 2V/V
R
L
= 16Ω
P
OUT
= 10mW
0.1
THD+N (%)
THD+N (%)
MAX4366 toc01
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
V
CC
= 5V
A
V
= 3V/V
R
L
= 16Ω
P
OUT
= 10mW
0.1
THD+N (%)
MAX4366 toc02
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4366 toc03
1
1
1
P
OUT
= 10mW
0.1
0.01
P
OUT
= 60mW
P
OUT
= 25mW
P
OUT
= 25mW
0.01
P
OUT
= 60mW
P
OUT
= 25mW
0.01
P
OUT
= 60mW
V
CC
= 5V
A
V
= 4V/V
R
L
= 16Ω
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4366 toc04
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4366 toc05
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
V
CC
= 5V
A
V
= 3V/V
R
L
= 32Ω
0.1
THD+N (%)
MAX4366 toc06
1
1
V
CC
= 5V
A
V
= 2V/V
R
L
= 32Ω
0.1
THD+N (%)
1
P
OUT
= 10mW
0.1
THD+N (%)
P
OUT
= 60mW
P
OUT
= 25mW
P
OUT
= 50mW
0.01
P
OUT
= 75mW
P
OUT
= 50mW
0.01
P
OUT
= 75mW
P
OUT
= 120mW
0.001
0.01
V
CC
= 5V
A
V
= 20V/V
R
L
= 16Ω
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
P
OUT
= 120mW
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4366 toc07
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX4366 toc08
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
V
CC
= 3V
A
V
= 2V/V
R
L
= 16Ω
0.1
THD+N (%)
P
OUT
= 10mW
MAX4366 toc09
1
V
CC
= 5V
A
V
= 4V/V
R
L
= 32Ω
0.1
THD+N (%)
P
OUT
= 50mW
P
OUT
= 75mW
1
P
OUT
= 50mW
1
0.1
THD+N (%)
P
OUT
= 75mW
P
OUT
= 120mW
0.01
0.01
P
OUT
= 120mW
0.01
V
CC
= 5V
A
V
= 20V/V
R
L
= 32Ω
P
OUT
= 60mW
P
OUT
= 25mW
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
4
_______________________________________________________________________________________
