Fairchild Semiconductor FAN7021 Datasheet
FAN7021
CMOS Power Amplifier
www.fairchildsemi.com
Features
• Continuous Average Power is 1.0W (8Ω)
• Low THD: Under 0.2% (5V)
• Do not Need Output Coupling Capacitor or Bootstrap
Capacitor
• Low Shutdown Current: 0.01µA
• Shutdown: High Active
• Built in Reduction Circuit for Popping noise
• Built in TSD Circuit
Typical Applications
• Cellular Phone
• Portable Computer
•Audio Systems
Internal Block Diagram
Description
The FAN7021 is a bridge connected audio power amplifier
capable of delivering 1W of continuous average power to an
8Ω load with less than 0.2%(THD) from a 5V power supply.
The FAN7021 require few external components and operate
on low supply voltage from 2.0V to 5.5V. Since the
FAN7021 does not require output coupling capacitor,
bootstrap capacitors, or snubber networks, it is ideally suited
for low power portable systems that requ i re minimum
volume and weight. The FAN7021 feqtures an externally
controlled, low power consumption shutdown mode (0.01
uA,typ). Additional FAN7021 features include thermal
shutdown protection, unity gain stability, and external gain
set.
8-SOP-225
1
IN-
IN+
BP
SD
VDD
©2002 Fairchild Semiconductor Corporation
4
3
2
1
6
Bias
100kΩ
20kΩ
20kΩ
100kΩ
5
8
7
O1
V
V
O2
GND
Rev. 1.0.1
FAN7021
Pin Assignments
V
O2
GND V
DD
V
O1
8 7 6 5
FAN7021
1 2 3 4
SD BP IN+ IN-
Pin Definitions
Pin Number Pin Name Pin Function Description
1 SD Shutdown
2 BP Bypass
3 IN+ Input +
4IN− Input −
5V
6V
O1
DD
7 GND Ground
8V
O2
Power AMP Output 1
Supply Voltage
Power AMP Output 2
Absolute Maximum Ratings (Ta = 25°°°°C)
Parameter Symbol Value Unit Remark
Maximum Supply Voltage V
Power Dissipation P
Operating Temperature T
Storage Temperature T
Thermal Resistance θ
DD
D
OPR
STG
JA
6.0 V Maximum Supply Voltage
-W -
−40 ~ +85 °C Operating Temperature
−65 ~ +150 °C Storage Temperature
180 °C/W Thermal Resistance
Recommended Operating Conditions (Ta = 25°°°°C)
Parameter Symbol Min. Typ. Max. Unit
Operating Supply Voltage V
2
DD
2.0 - 5.5 V
FAN7021
Electrical Characteristics
(RL = 8Ω
, Ta = 25°C,
Parameter Symbol Conditions Min. Typ. Max. Unit
V
= 5.0V, UNLESS OTHERWISE SPECIFIED
DD
Quiescent Power Supply Current I
Shutdown Current I
Output Offset Voltage V
Output Power P
Total Harmonic Distortion+noise THD+N
Power Supply Rejection Ratio PSRR V
= 3.3V, UNLESS OTHERWISE SPECIFIED
V
DD
Quiescent Power Supply Current I
Shutdown Current I
Output Offset Voltage V
Output Power P
Total Harmonic Distortion+noise THD+N
Power Supply Rejection Ratio PSRR V
= 2.6V, UNLESS OTHERWISE SPECIFIED
V
DD
Quiescent Power Supply Current I
Shutdown Current I
Output Offset Voltage V
Output Power P
Total Harmonic Distortion+Noise THD+N
Power Supply Rejection Ratio PSRR V
Unless otherwise specified)
DD
SD
OS
O
DD
SD
OS
O
DD
SD
OS
O
VIN=0V,IO=0A - 4.0 7.0 mA
VSD=V
DD
- 0.01 2.0 µA
VIN=0V - 5 50 mV
THD=0.2% (Max.);f=1KHz - 1 - W
=0.25Wrms,AVD=2
P
O
f=1KHz - 0.1 - %
f=20KHz - 0.4 - %
=4.9V to 5.1V - 65 - dB
DD
VIN=0V,IO=0A - 3.0 - mA
VSD=V
DD
-0.01- µA
VIN=0V - 5 - mV
THD=1% (Max.);f=1KHz - 0.5 - W
=0.25Wrms,AVD=2
P
O
f=1KHz - 0.15 - %
f=20KHz - 0.45 - %
=3.2V to 3.4V - 65 - dB
DD
VIN=0V,IO=0A - 2.5 - mA
VSD=V
DD
-0.01- µA
VIN=0V - 5 - mV
THD=0.3% (Max.);f=1KHz - 0.25 - W
=0.25Wrms,AVD=2
P
O
f=1KHz - 0.25 - %
f=20KHz - 0.5 - %
=2.5V to 2.7V - 65 - dB
DD
3
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