General Description
The MAX4364/MAX4365 are bridged audio power
amplifiers intended for portable audio devices with
internal speakers. The MAX4364 is capable of deliver-
ing 1.4W from a single 5V supply and 500mW from a
single 3V supply into an 8
load. The MAX4365 is
capable of delivering 1W from a single 5V supply and
450mW from a single 3V supply into an 8
load. The
MAX4364/MAX4365 feature 0.04% THD + N at 1kHz,
68dB PSRR at 217Hz and only 10nA of supply current
in shutdown mode.
The MAX4364/MAX4365 bridged outputs eliminate the
need for output-coupling capacitors, minimizing exter-
nal component count. The MAX4364/MAX4365 also
include internal DC bias generation, clickless operation,
short-circuit and thermal-overload protection. Both
devices are unity-gain stable, with the gain set by two
external resistors.
The MAX4364 is available in a small 8-pin SO package.
The MAX4365 is available in tiny 8-pin thin QFN
(3mm
3mm
0.8mm) and MAX packages.
Applications
Cellular Phones
PDAs
Two-Way Radios
General-Purpose Audio
Features
o 1.4W into 8 Load (MAX4364)
o 1W into 8 Load (MAX4365)
o 0.04% THD + N at 1kHz
o 68dB PSRR at 217Hz
o 2.7V to 5.5V Single-Supply Operation
o 5mA Supply Current
o Low-Power, 10nA Shutdown Mode
o Pin Compatible with the LM4861/LM4862/LM4864
(MAX4364)
o Clickless Power-Up and Shutdown
o Thermal-Overload and Short-Circuit Protection
o Available in Thin QFN, MAX, and SO Packages
MAX4364/MAX4365
1.4W and 1W, Ultra-Small, Audio Power
Amplifiers with Shutdown
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
19-2387; Rev 1; 10/02
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.
PART
TEMP RANGE
PIN-PACKAGE
TOP
MARK
MAX4364ESA
-40C to +85C
8 SO
--
MAX4365EUA
-40C to +85C
8 MAX
--
MAX4365ETA
-40C to +85C
8 Thin QFN-EP*
ACD
V
CC
V
CC
6
2
3
4
1
8
5
7
OUT-
IN-
IN+
BIAS
C
BIAS
C
IN
R
IN
R
F
50k
50k
10k
10k
AUDIO
INPUT
CLICKLESS/POPLESS
SHUTDOWN CONTROL
GND
SHDN
OUT+
MAX4364
Typical Application Circuit/Functional Diagram
Pin Configurations appear at end of data sheet.
*EP = Exposed paddle.
MAX4364/MAX4365
1.4W and 1W, Ultra-Small, Audio Power
Amplifiers with Shutdown
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
V
CC
, OUT_ to GND...................................................-0.3V to +6V
IN+, IN-, BIAS, SHDN to GND....................-0.3V to (V
CC
+ 0.3V)
Output Short Circuit (OUT+ to OUT-) (Note 1)...........Continuous
Continuous Power Dissipation (T
A
= +70C)
8-Pin MAX (derate 4.1mW/C above +70C) ..............330mW
8-Pin Thin QFN (derate 24.4mW/C above +70C) ....1951mW
8-Pin SO (derate 5.88mW/C above +70C).................471mW
Junction Temperature ......................................................+150C
Operating Temperature Range ...........................-40C to +85C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
ELECTRICAL CHARACTERISTICS--5V
(V
CC
= 5V, R
L
=
, C
BIAS
= 1F to GND, SHDN = GND, T
A
= +25C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
CC
Inferred from PSRR test
2.7
5.5
V
MAX4364
7
13
M AX 4364, T
A
= T
M IN
to T
M AX
17
M AX 4365
5
8
Supply Current
I
CC
(Note 3)
M AX 4365, T
A
= T
M IN
to T
M AX
11
mA
Shutdown Supply Current
I
SHDN
SHDN = V
CC
0.01
4
A
V
IH
V
CC
x
0.7
SHDN Threshold
V
IL
V
CC
x
0.3
V
Common-Mode Bias Voltage
V
BIAS
(Note 4)
V
CC
/2 -
5%
V
CC
/2
V
CC
/2
+ 5%
V
Output Offset Voltage
V
OS
IN- = OUT+, IN+ = BIAS (Note 5)
1
10
mV
V
CC
= 2.7V to 5.5V
DC
55
75
217Hz
68
Power-Supply Rejection Ratio
PSRR
V
RIPPLE
= 200mV
P-P
,
R
L
= 8
1kHz
58
dB
MAX4364
1200
1400
Output Power
P
OUT
R
L
= 8
, THD + N = 1%,
f
IN
= 1kHz (Note 6)
MAX4365
800
1000
mW
MAX4364,
P
OUT
= 1W
0.04
Total Harmonic Distortion Plus
Noise
THD + N
A
V
= -2V/V, R
L
= 8
,
f
IN
= 1kHz (Notes 7, 8)
MAX4365,
P
OUT
= 750mW
0.1
%
Noise
f
IN
= 10kHz, BW = 22Hz to 22kHz
12
V
RMS
Short-Circuit Current
I
SC
OUT+ to OUT- (Note 9)
600
mA
Thermal Shutdown Threshold
160
o
C
Thermal Shutdown Hysteresis
15
o
C
Power-Up Time
t
PU
50
ms
Shutdown Time
t
SHDN
10
s
Enable Time from Shutdown
t
ENABLE
50
ms
Note 1: Continuous power dissipation must also be observed.
MAX4364/MAX4365
1.4W and 1W, Ultra-Small, Audio Power
Amplifiers with Shutdown
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS--3V
(V
CC
= 3V, R
L
=
, C
BIAS
= 1F to GND, SHDN = GND, T
A
= +25C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4364
6
Supply Current
I
CC
(Note 3)
MAX4365
4.5
mA
Shutdown Supply Current
I
SHDN
SHDN = V
CC
10
nA
MAX4364
400
500
Output Power
P
OUT
R
L
= 8
, THD + N =
1%, f
IN
= 1kHz
(Note 6)
MAX4365
350
450
mW
MAX4364,
P
OUT
= 400mW
0.05
Total Harmonic Distortion Plus
Noise
THD + N
A
V
= -2V/V, R
L
= 8
,
f
IN
= 1kHz (Notes 7, 8) MAX4365,
P
OUT
= 400mW
0.08
%
Note 2: All specifications are 100% tested at T
A
= +25C.
Note 3: 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 4: Common-mode bias voltage is the voltage on BIAS and is nominally V
CC
/2.
Note 5: Maximum differential-output offset voltage is tested in a unity-gain configuration. V
OS
= V
OUT+
- V
OUT-
.
Note 6: Output power is specified by a combination of a functional output-current test, and characterization analysis.
Note 7: Guaranteed by design, not production tested.
Note 8: Measurement bandwidth for THD + N is 22Hz to 22kHz.
Note 9: Extended short-circuit conditions result in a pulsed output.
Typical Operating Characteristics
(V
CC
= 5V, THD + N measurement bandwidth = 22Hz to 22kHz, T
A
= +25C, unless otherwise noted.)
MAX4364
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX4364 toc01
FREQUENCY (Hz)
THD + N (%)
100
1k
0.1
1
10
0.01
0
10k
V
CC
= 5V
A
V
= 2V/V
R
L
= 8
0.25W
0.5W
1W
MAX4364 toc02
FREQUENCY (Hz)
THD + N (%)
100
1k
0.1
1
10
0.01
0
10k
V
CC
= 5V
A
V
= 4V/V
R
L
= 8
0.25W
0.5W
1W
MAX4364
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX4364 toc03
FREQUENCY (Hz)
THD + N (%)
100
1k
0.1
1
10
0.01
0
10k
V
CC
= 5V
A
V
= 20V/V
R
L
= 8
0.25W
0.5W
1W
MAX4364
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX4364/MAX4365
1.4W and 1W, Ultra-Small, Audio Power
Amplifiers with Shutdown
4
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V
CC
= 5V, THD + N measurement bandwidth = 22Hz to 22kHz, T
A
= +25C, unless otherwise noted.)
MAX4364
OUTPUT POWER vs. LOAD RESISTANCE
MAX4364 toc12
LOAD RESISTANCE (
)
OUTPUT POWER (mW)
30
20
10
600
1200
1800
2400
3000
0
0
50
40
V
CC
= 5V
f
IN
= 1kHz
10% THD + N
1% THD + N
MAX4364
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX4364 toc11
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
4.8
4.1
3.4
500
1000
1500
2000
2500
0
2.7
5.5
R
L
= 8
f
IN
= 1kHz
1% THD + N
10% THD + N
1650
1000
520
200
40
0.01
0.1
1
10
100
0.001
0
2440
MAX4364 toc10
OUTPUT POWER (mW)
THD + N (%)
V
CC
= 3V
A
V
= 4V/V
R
L
= 8
20kHz
20Hz
1kHz
MAX4364
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
1700
1000
525
190
20
0.01
0.1
1
10
100
0.001
0
2500
MAX4364 toc09
OUTPUT POWER (mW)
THD + N (%)
V
CC
= 3V
A
V
= 2V/V
R
L
= 8
20kHz
20Hz
1kHz
MAX4364
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
1650
1000
520
200
40
0.01
0.1
1
10
100
0.001
0
2450
MAX4364 toc08
OUTPUT POWER (mW)
THD + N (%)
V
CC
= 5V
A
V
= 4V/V
R
L
= 8
20Hz
20kHz
1kHz
MAX4364
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
1650
1000
520
200
40
0.01
0.1
1
10
100
0.001
0
2450
MAX4364
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. OUTPUT POWER
MAX4364 toc07
OUTPUT POWER (mW)
THD + N (%)
V
CC
= 5V
A
V
= 2V/V
R
L
= 8
20kHz
1kHz
20Hz
MAX4364 toc06
FREQUENCY (Hz)
THD + N (%)
100
1k
0.1
1
10
0.01
0
10k
V
CC
= 3V
A
V
= 20V/V
R
L
= 8
0.25W
0.4W
MAX4364
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX4364 toc05
FREQUENCY (Hz)
THD + N (%)
100
1k
0.1
1
10
0.01
0
10k
V
CC
= 3V
A
V
= 4V/V
R
L
= 8
0.25W
0.4W
MAX4364
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX4364 toc04
FREQUENCY (Hz)
THD + N (%)
100
1k
0.1
1
10
0.01
0
10k
V
CC
= 3V
A
V
= 2V/V
R
L
= 8
0.25W
0.4W
MAX4364
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX4364/MAX4365
1.4W and 1W, Ultra-Small, Audio Power
Amplifiers with Shutdown
_______________________________________________________________________________________
5
Typical Operating Characteristics (continued)
(V
CC
= 5V, THD + N measurement bandwidth = 22Hz to 22kHz, T
A
= +25C, unless otherwise noted.)
MAX4364 toc21
FREQUENCY (Hz)
THD + N (%)
100
1k
0.1
1
10
0.01
0
10k
V
CC
= 5V
A
V
= 4V/V
R
L
= 8
0.25W
0.5W
0.75W
MAX4365
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX4365
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX4364 toc20
FREQUENCY (Hz)
THD + N (%)
100
1k
0.1
1
10
0.01
0
10k
V
CC
= 5V
A
V
= 2V/V
R
L
= 8
0.25W
0.5W
0.75W
MAX4364
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4364 toc19
TEMPERATURE (
C)
SUPPLY CURRENT (nA)
35
10
-15
20
40
60
80
100
0
-40
85
60
V
CC
= 5V
MAX4364
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4364 toc18
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (nA)
4.8
4.1
3.4
2
4
6
8
12
0
2.7
5.5
10
MAX4364
SUPPLY CURRENT vs. TEMPERATURE
MAX4364 toc17
TEMPERATURE (
C)
SUPPLY CURRENT (mA)
35
10
-15
6
7
8
9
10
5
-40
85
60
V
CC
= 5V
MAX4364
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4364 toc16
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
4.8
4.1
3.4
6.5
7.0
7.5
8.0
9.0
6.0
2.7
5.5
8.5
MAX4364
POWER DISSIPATION vs. OUTPUT POWER
MAX4364 toc15
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
300
200
100
30
90
210
270
300
0
0
500
400
V
CC
= 3V
f
IN
= 1kHz
R
L
= 8
150
60
120
240
180
MAX4364
POWER DISSIPATION vs. OUTPUT POWER
MAX4364 toc14
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
900
600
300
70
210
490
630
700
0
0
1500
1200
V
CC
= 5V
f
IN
= 1kHz
R
L
= 8
350
140
280
560
420
MAX4364
OUTPUT POWER vs. LOAD RESISTANCE
MAX4364 toc13
LOAD RESISTANCE (
)
OUTPUT POWER (mW)
30
20
10
200
400
800
1000
1200
0
0
50
40
600
V
CC
= 3V
f
IN
= 1kHz
10% THD + N
1% THD + N
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