The effective gains of the MAX4367 and MAX4368 are

yields four times the output power due to doubling of

the output voltage.

Since the differential outputs are biased at midsupply,

there is no net DC voltage across the load. This elimi-

nates the need for DC-blocking capacitors required for

single-ended amplifiers. These capacitors can be

large, expensive, consume board space, and degrade

low-frequency performance.

Single-Ended Configuration

The MAX4366/MAX4367/MAX4368 can be used as sin-

gle-ended amplifiers (Figure 2). The gain of the device

in single-ended mode is 1/2 the gain in BTL configura-

tion and the output power is reduced by a factor of 4.

The single-ended gains of the MAX4367 and MAX4368

are 1V/V and 1.5V/V, respectively. Set the MAX4366

gain according to the

Gain-Setting Resistors section.

In single-ended mode, the load must be capacitively

coupled to the device output to block the half-supply

DC voltage from the load (see

Output Coupling

Capacitor section). Leave the unused output floating.

Power Dissipation

Under normal operating conditions, linear power ampli-

fiers like the MAX4366/MAX4367/MAX4368 can dissi-

pate a significant amount of power. The maximum

power dissipation for each package is given in the

Absolute Maximum Ratings section under Continuous

Power Dissipation or can be calculated by the following

equation:

derating factor in °C/W as specified in the

Absolute

P

TT

DISS MAX

J MAX

A

JA

()

()

=

-

Θ

V

V

P

V

R

RMS

OUT P P

OUT

RMS

L

=

=

−

()

22

2

330mW, Ultra-Small, Audio Power Amplifiers

with Shutdown

10

______________________________________________________________________________________

OUT+

OUT-

8

5

C

OUT

R

L

MAX4367

Figure 2. MAX4367 Single-Ended Configuration

6

OUT-

IN+

BIAS

AUDIO INPUT

3

2

CLICKLESS/

POPLESS

SHUTDOWN

CONTROL

GND

SHDN

8

OUT+ 5

7

1

MAX4366

50k

Ω

50k

Ω

10k

Ω

10k

Ω

IN-

4

Figure 3. MAX4366 Typical Application Circuit