MAX9700 Maxim, MAX9700 Datasheet - Page 10

• Manufacturer Part Number: MAX9700
• Description: 1.2W / Low-EMI / Filterless / Class D Audio Amplifier
• Manufacturer: Maxim

Figure 2. MAX9700 Output with an Input Signal Applied (SSM Mode)
the load as a DC voltage, resulting in finite load current,
increasing power consumption. When no signal is pre-
sent at the input of the MAX9700, the outputs switch as
shown in Figure 4. Because the MAX9700 drives the
speaker differentially, the two outputs cancel each other,
resulting in no net Idle Mode™ voltage across the
speaker, minimizing power consumption.
Efficiency of a class D amplifier is attributed to the
region of operation of the output stage transistors. In a
class D amplifier, the output transistors act as current-
1.2W, Low-EMI, Filterless,
Class D Audio Amplifier
Idle Mode is a trademark of Maxim Integrated Products.
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V
V
V
OUT+
IN+
IN-
- V
OUT-
OUT+
OUT-
t
ON(MIN)
t
SW
Efficiency
t
SW
steering switches and consume negligible additional
power. Any power loss associated with the class D out-
put stage is mostly due to the I
on-resistance, and quiescent current overhead.
The theoretical best efficiency of a linear amplifier is
78%; however, that efficiency is only exhibited at peak
output powers. Under normal operating levels (typical
music reproduction levels), efficiency falls below 30%,
whereas the MAX9700 still exhibits >90% efficiencies
under the same conditions (Figure 5).
t
SW
t
SW
✕
R loss of the MOSFET