Maximum Ratings section. For example,

package is 222°C/W.

The increase in power delivered by the BTL configura-

tion directly results in an increase in internal power dis-

sipation over the single-ended configuration. If the

power dissipation exceeds the maximum allowed for a

impedance, decrease the ambient temperature, or add

heat sinking to the device. Large output, supply, and

ground traces improve the maximum power dissipation

in the package.

Thermal overload protection limits total power dissipa-

tion in the MAX4366/MAX4367/MAX4368. When the

junction temperature exceeds +165°C, the thermal pro-

tection circuitry disables the amplifier output stage. The

amplifiers are re-enabled once the junction temperature

cools by +10°C. This results in a pulsing output under

continuous thermal overload conditions avoiding dam-

age to the port.

Component Selection

Gain-Setting Resistors

External feedback components set the gain of the

of the input amplifier as follows:

The gain of the device in a single-ended configuration

10k

Ω and 50kΩ. The gains of the MAX4367/MAX4368

are set internally (Figure 4).

Input Filter

a highpass filter that removes the DC bias from an

incoming signal. The AC-coupling capacitor allows the

amplifier to bias the signal to an optimum DC level.

Assuming zero source impedance, the -3dB point of

the highpass filter is given by:

ƒ=

-3

1

2

dB

IN IN

RC

π

A

R

R

VD

F

IN

=









2

330mW, Ultra-Small, Audio Power Amplifiers

with Shutdown

______________________________________________________________________________________

11

Figure 4. MAX4367/MAX4368 Typical Application Circuit

6

OUT-

IN+

BIAS

AUDIO

INPUT

3

2

CLICKLESS/

POPLESS

SHUTDOWN

CONTROL

GND

SHDN

8

OUT+

5

7

1

MAX4367

MAX4368

50k

Ω

50k

Ω

10k

Ω

10k

Ω

IN-

4

Ω

PIN NUMBERS REFER TO SOT23, QFN, AND

µMAX PACKAGES