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PDF MAX4364 Data sheet ( Hoja de datos )
| Número de pieza | MAX4364 | |
| Descripción | 1.4W and 1W / Ultra-Small / Audio Power Amplifiers with Shutdown | |
| Fabricantes | Maxim Integrated | |
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19-2387; Rev 1; 10/02
1.4W and 1W, Ultra-Small, Audio Power
Amplifiers with Shutdown
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 8Ω load. The MAX4365 is
capable of delivering 1W from a single 5V supply and
450mW from a single 3V supply into an 8Ω 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 µMAX packages.
Applications
Cellular Phones
PDAs
Two-Way Radios
General-Purpose Audio
Features
o 1.4W into 8Ω Load (MAX4364)
o 1W into 8Ω 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, µMAX, and SO Packages
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX4364ESA -40°C to +85°C 8 SO
MAX4365EUA -40°C to +85°C 8 µMAX
MAX4365ETA -40°C to +85°C 8 Thin QFN-EP*
*EP = Exposed paddle.
TOP
MARK
—
—
ACD
Pin Configurations appear at end of data sheet.
Typical Application Circuit/Functional Diagram
CBIAS
VCC
6
VCC
50kΩ
2 BIAS
50kΩ
CLICKLESS/POPLESS SHDN 1
SHUTDOWN CONTROL
OUT- 8
3 IN+
CIN
AUDIO
RIN
4 IN-
INPUT
10kΩ 10kΩ
OUT+ 5
MAX4364 GND 7
RF
________________________________________________________________ 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.
1 page  
1.4W and 1W, Ultra-Small, Audio Power
Amplifiers with Shutdown
Typical Operating Characteristics (continued)
(VCC = 5V, THD + N measurement bandwidth = 22Hz to 22kHz, TA = +25°C, unless otherwise noted.)
MAX4364
OUTPUT POWER vs. LOAD RESISTANCE
1200
VCC = 3V
fIN = 1kHz
1000
800
10% THD + N
600
400
200
1% THD + N
0
0 10 20 30 40
LOAD RESISTANCE (Ω)
50
MAX4364
SUPPLY CURRENT vs. SUPPLY VOLTAGE
9.0
8.5
MAX4364
POWER DISSIPATION vs. OUTPUT POWER
700
630
560
490
420
350
280
210
140
70
0
0
VCC = 5V
fIN = 1kHz
RL = 8Ω
300 600 900 1200 1500
OUTPUT POWER (mW)
MAX4364
SUPPLY CURRENT vs. TEMPERATURE
10
VCC = 5V
9
MAX4364
POWER DISSIPATION vs. OUTPUT POWER
300
270
240
210
180
150
120
90
60
30
0
0
12
VCC = 3V
fIN = 1kHz
RL = 8Ω
100 200 300 400
OUTPUT POWER (mW)
MAX4364
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
500
10
8.0 8
8
7.5 6
7
7.0 4
6.5 6 2
6.0
2.7
3.4 4.1 4.8
SUPPLY VOLTAGE (V)
5.5
MAX4364
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
100
VCC = 5V
80
60
40
20
5
-40
-15 10 35 60
TEMPERATURE (°C)
85
MAX4365
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
10
VCC = 5V
AV = 2V/V
RL = 8Ω
1
0.25W
0.5W
0.1
0.75W
0
2.7
3.4 4.1 4.8
SUPPLY VOLTAGE (V)
5.5
MAX4365
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
10
VCC = 5V
AV = 4V/V
RL = 8Ω
1
0.25W
0.5W
0.1
0.75W
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
0.01
0
100 1k
FREQUENCY (Hz)
0.01
10k 0
100 1k
FREQUENCY (Hz)
10k
_______________________________________________________________________________________ 5
5 Page 
1.4W and 1W, Ultra-Small, Audio Power
Amplifiers with Shutdown
CBIAS
VCC
50kΩ
2 BIAS
6
VCC
50kΩ
CLICKLESS/
POPLESS
SHUTDOWN
CONTROL
SHDN 1
OUT- 8
3 IN+
CIN
AUDIO INPUT
RIN
4 IN-
10kΩ
10kΩ
OUT+ 5
MAX4364
MAX4365
7
GND
RF
Figure 2. High-Gain Configuration
CF
Table 1. Efficiency in a 5V, 8Ω BTL System
OUTPUT
POWER (W)
0.25
0.50
0.75
1.00
1.25
1.40
INTERNAL POWER
DISSIPATION (W)
0.55
0.63
0.63
0.59
0.53
0.48
EFFICIENCY (%)
31.4
44.4
54.4
62.8
70.2
74.3
cients, such as tantalum or aluminum electrolytic.
Capacitors with high-voltage coefficients, such as
ceramics, may result in an increase distortion at low
frequencies.
Other considerations when designing the input filter
include the constraints of the overall system, the actual
frequency band of interest and click-and-pop suppres-
sion. Although high-fidelity audio calls for a flat gain
response between 20Hz and 20kHz, portable voice-
reproduction devices such as cellular phones and two-
way radios need only concentrate on the frequency
range of the spoken human voice (typically 300Hz to
3.5kHz). In addition, speakers used in portable devices
typically have a poor response below 150Hz. Taking
these two factors into consideration, the input filter may
not need to be designed for a 20Hz to 20kHz response,
saving both board space and cost due to the use of
smaller capacitors.
BIAS Capacitor
The BIAS bypass capacitor, CBIAS, improves PSRR and
THD + N by reducing power-supply noise at the com-
mon-mode bias node, and serves as the primary click-
and-pop suppression mechanism. CBIAS is fed from an
internal 25kΩ source, and controls the rate at which the
common-mode bias voltage rises at startup and falls
during shutdown. For optimum click-and-pop suppres-
sion, ensure that the input capacitor (CIN) is fully
charged (ten time constants) before CBIAS. The value of
CBIAS for best click-and-pop suppression is given by:
CBIAS
≤
10
CINRIN
25kΩ
In addition, a larger CBIAS value yields higher PSRR.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX4364.PDF ] | |
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