FAN7033MPX Fairchild Semiconductor, FAN7033MPX Datasheet - Page 15

• Manufacturer Part Number: FAN7033MPX
• Description: Audio Amplifiers 2W CMOS Stereo Power Amplifier wtih Fixed
• Manufacturer: Fairchild Semiconductor

Specifications of FAN7033MPX

• Product: Class-AB
• Output Power: 1.9 W
• Thd Plus Noise: 0.6 %
• Operating Supply Voltage: 3 V, 5 V
• Maximum Power Dissipation: Internally Limited
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Audio Load Resistance: 8 Ohms
• Input Signal Type: Differential
• Minimum Operating Temperature: - 40 C
• Output Signal Type: Differential
• Supply Type: Single
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Output Type: 2-Channel Stereo
• Package / Case: MLP-14
• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 2-Channel Stereo
• Output Power (typ): 1.9x2@4OhmW
• Audio Amplifier Function: Speaker
• Total Harmonic Distortion: 0.6@4Ohm@1W%
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Requirement: Single
• Rail/rail I/o Type: No
• Power Supply Rejection Ratio: 68dB
• Single Supply Voltage (min): 2.7V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 14
• Package Type: MLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Applications Information
Functional Description
The FAN7033MP is a stereo power amplifier capable of delivering 1.9W continuous RMS(Root Mean Square)
power into 4Ω load with 1% THD(Total Harmonic Distortion). At 10% THD, the FAN7033MP can deliver above 2W
into 4Ω load. The FAN7033MP has 5 supply input pins. Three among them are used for positive supply and the
rest of them is for the ground. Three positive supply input pins : pin3(PVDD2), pin10(PVDD1) and pin11(VDD) must
be tied together. To improve the cross-talk between cannels, these pins are not connected internally. Therefore,
these pins must be externally connected on the PCB. Pin 8 and the exposed pad are allocated to ground. Thus, the
exposed pad must be connected to the ground.
The FAN7033MP is provided with differential inputs. These inputs increase the common-mode noise immunity.
Furthermore, differential configuration in the input section helps to decrease total harmonic distortion and pop
noise that occurs when shutdown is released. When only single input is available, the distortion performance is
slightly degraded.
To save the standby power consumption, the FAN7033MP provides shutdown function. Putting pin14(SD) to be
low, the chip falls into shutdown mode. At this mode, it consumes micro power at the room temperature of 25°C
and this power consumption is only due to the leakage current of the chip. This leakage current is the strong func-
tion of the temperature. Thus at the high ambient temperature, the shutdown current slightly increases. The logic
threshold of shutdown pin lies nearby VDD/2. So, the logic threshold level does not follow TTL logic level. Thus,
when the users want to control the chip according to the TTL logic level, some kinds of logic-level-changing circuit
may be needed.
Operation of the Amplifier
Figure 1 shows the configuration of the single channel BTL(Bridge-Tied Load) power amplifier. To make the differ-
ential input configuration, the FAN7033MP uses several resistor networks as depicted in figure 1. For the input
resistor, 15kΩ is used. This resistor converts the input voltage signal to the current signal. The converted current
signal flows to the feedback resistor. For FAN7033MP, the feedback resistance is six times larger than input resis-
tance. Thus, the gain is 12(about 21.6dB). For the 5V supply, the input signal has 0.83Vpeak voltage swing makes
10Vpp output swing. The exact gain formula is given by
As shown in equation (1), for the single-ended input case, the gain is also preserved. However, to get the same
output swing with the differential input case, the input swing must be double comparing with the differential input
swing.
PCB Layout and Supply Regulation
Metal trace resistance between the BTL output and the parasitic resistance of the power supply line both heavily
INN
INP
OUTP OUTN
C
C
INN
INP
Figure 1. Configuration of Power Amplifier
–
15kΩ
90kΩ
15kΩ
15kΩ
15kΩ
VDD/2
=
12 INP INN
90kΩ
(
AMP1
AMP2
90kΩ
–
90kΩ
)
OUTP
OUTN
(1)
FAN7033MP
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