©2001 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0
Features
• Cont inuou s average power i s 1.0W (8Ω)
• Low THD: under 0.2% (5V)
• Do not need output coupling capacitor or bootstrap
capacitor
• Low shutdown current: 0.01µA
• Shut down : High acti ve
• Built in reduction circuit for popping noise
• Built in TSD circuit
Typical Applications
• Cellular phone
• Portable computer
• Audio system s
Description
The FAN7021 is a bridge connected audio power amplifier
capable of delivering 1W o f continuous avera ge powe r to an
8Ω load with less than 0.2%(THD) from a 5V power supply.
The FAN7021 r equire few external com ponents 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 pow er portable systems that require min imum
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
Internal Block Diagram
GND
Bias
SD
V
DD
BP
IN+
IN- V
O1
V
O2
4
3
2
6
1
7
8
5
20K
20K
100K
100K
FAN7021
CMOS Power Ampl ifier
FAN7021
2
Pin Assignments
Pin Definitions
Absolute Maximum Ratings (Ta = 25°
°°
°C)
Recommended Operating Conditions (Ta = 25 °
°°
°C)
Pin Number Pin Name Pin Function Description
1 SD Shutdown
2 BP Bypass
3 IN+ Input +
4IN−Input −
5V
O1 Power AMP output 1
6V
DD Supply Voltage
7 GND Ground
8V
O2 Power AMP output 2
Parameter Symbol Value Unit Remark
Maximum Supply Voltage VDD 6.0 V Maximum supply voltage
Power Dissipation PD-W -
Operating Temperature TOPR −40 ~ +85 °C Operating temperature
Storage Temperature TSTG −65 ~ +150 °C Storage temperature
Parameter Symbol Min. Typ. Max. Unit
Operating Supply Voltage VDD 2.0 - 5.5 V
8 7 6 5
FAN7021
1 2 3 4
V
O2
GND V
DD
V
O1
SD BP IN+ IN-
FAN7021
3
Electrical Characteristics
(RL = 8Ω, Ta = 25°C, Unless otherwise specified)
Parameter Symbol Conditions Min. Typ. Max. Unit
VDD = 5.0V, UNLESS OTHERWISE SPECIFIED
Quiescent power supply current IDD VIN=0V,IO=0A - 4.0 7.0 mA
Shutdown current ISD VSD=VDD -0.012.0µA
Output offset voltage VOS VIN=0V - 5 50 mV
Output power POTHD=0.2% (Max.);f=1KHz - 1 - W
Total harmonic distortion+Noise THD+N PO=0.25Wrms,AVD=2,filter=80KHz
f=1KHz - 0.1 - %
f=20KHz - 0.4 - %
Power supply rejection ratio PSRR VDD=4.9V to 5.1V - 65 - dB
VDD = 3.3V, UNLESS OTHERWISE SPECIFIED
Quiescent power supply current IDD VIN=0V,IO=0A - 3.0 - mA
Shutdown current ISD VSD=VDD -0.01- µA
Output offset voltage VOS VIN=0V - 5 - mV
Output power POTHD=1% (Max.);f=1KHz 0.45 0.5 - W
Total harmonic distortion+Noise THD+N PO=0.25Wrms,AVD=2,filter=80KHz
f=1KHz - 0.15 - %
f=20KHz - 0.45 - %
Power supply rejection ratio PSRR VDD=3.2V to 3.4V - 65 - dB
VDD = 2.6V, UNLESS OTHERWISE SPECIFIED
Quiescent power supply current IDD VIN=0V,IO=0A - 2.5 - mA
Shutdown current ISD VSD=VDD -0.01- µA
Output offset voltage VOS VIN=0V - 5 - mV
Output power POTHD=0.3% (Max.);f=1KHz - 0.25 - W
Total harmonic distortion+Noise THD+N PO=0.25Wrms,AVD=2,filter=80KHz
f=1KHz - 0.25 - %
f=20KHz - 0.5 - %
Power supply rejection ratio PSRR VDD=2.5V to 2.7V - 65 - dB
FAN7021
4
Typical Application Circuits
+
V
DD
C
S
1u
R
PU
10K
+
C
B
1u
+
C
I
0.39u
R
I
20K
R
F
20K
GND
Bias
SD
V
DD
BP
IN+
IN-
V
O1
V
O2
4
3
2
6
1
7
8
5
20K
20K
100K
100K
Speaker
8Ω
FAN7021
5
Performan ce Char acteri stics
Figure 2. THD+N versus output power
Figure 3. THD+N versus output power Figure 4. THD+N versus Frequency
Figure 5. THD+N versus Frequency
Figure 1. THD+N versus output power
Figure 6. THD+N versus Frequency
FAN7021
6
Performance Characte ristics (Continued)
Figure 9. Power supply rejection ration
Figure 8. Power supply rejection ration
Figure 7. Pow er supply rejection ration
Figure 10. Power Dissipation versus output power
Figure 11. Power Dissipation versus output power Figure 12. Power Dissipation versus outp ut power
FAN7021
7
Performance Characte ristics (Continued)
25 150
0.8
0.2
0.4
0.6
1
85-40 Ambient Temperature [ oC]
Power Dissipation [W]
Figure 13. Output power versus supply voltage Figure 14. Power darting curve
FAN7021
8
Mechanical Dimensions (Unit: mm)
Package
8-SOP-225
FAN7021
9
Ordering Information
Device Package Operating Temp.
FAN7021M 8-SOP-225 −40°C ~ +85°C
FAN7021
11/9/01 0.0m 001
Stock#DSxxxxxxxx
2001 Fairchild Semicond uctor Corporation
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user.
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reasonably expected to cause the failure of the life support
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