MAX4364ESA+T Maxim Integrated Products, MAX4364ESA+T Datasheet - Page 11

• Manufacturer Part Number: MAX4364ESA+T
• Description: IC AMP AUDIO PWR 1.4W MONO 8SOIC
• Manufacturer: Maxim Integrated Products
• Type: Class ABr

Specifications of MAX4364ESA+T

• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 1.4W x 1 @ 8 Ohm
• Voltage - Supply: 2.7 V ~ 5.5 V
• Features: Depop, Short-Circuit and Thermal Protection, Shutdown
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 2. High-Gain Configuration
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
Table 1. Efficiency in a 5V, 8 BTL System
POWER (W)
OUTPUT
0.25
0.50
0.75
1.00
1.25
1.40
INTERNAL POWER
______________________________________________________________________________________
DISSIPATION (W)
AUDIO INPUT
1.4W and 1W, Ultra-Small, Audio Power
0.55
0.63
0.63
0.59
0.53
0.48
C
BIAS
C
IN
R
IN
EFFICIENCY (%)
2
3
4
BIAS
IN+
IN-
31.4
44.4
54.4
62.8
70.2
74.3
50k
50k
V
CC
6
V
Amplifiers with Shutdown
CC
10k
R
C
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.
The BIAS bypass capacitor, C
THD+N by reducing power-supply noise at the common-
mode bias node, and serves as the primary click-and-
pop suppression mechanism. C
internal 25k
common-mode bias voltage rises at startup and falls
during shutdown. For optimum click-and-pop suppres-
sion, ensure that the input capacitor (C
charged (ten time constants) before C
C
In addition, a larger C
F
F
CLICKLESS/
SHUTDOWN
BIAS
CONTROL
POPLESS
MAX4364
MAX4365
10k
for best click-and-pop suppression is given by:
SHDN
OUT+ 5
OUT-
GND
source, and controls the rate at which the
7
8
C
1
BIAS
BIAS
10
value yields higher PSRR.
C R
BIAS
25
IN IN
k
, improves PSRR and
BIAS
BIAS
BIAS Capacitor
is fed from an
. The value of
IN
) is fully
11