Datasheet

© 2011 Fairchild Semiconductor www.fairchildsemi.com
FAB3103 • Rev. 1.0.2 5
FAB3103 — 2.3 Watt Class-D Audio Amplifier with Integrated Boost Regulator and Automatic Gain Control
Electrical Characteristics
Unless otherwise noted: AGCT=GND, R
L
=8 + 33µH, f=1KHz, and audio measurement bandwidth=22Hz to 20KHz
(AES17). Typical values are at V
BATT
=3.6V, T
A
=25°C, with typical external component values.
Symbol Parameter Conditions Min. Typ. Max. Unit
e
n
Output Noise
A-Weighted 38
µV
rms
Unweighted 51
T
STD
Thermal Shutdown Junction Temperature 165 °C
T
HYS
Thermal Shutdown
Hysteresis
Junction Temperature 25 °C
V
ULVO
V
BATT
Under-Voltage Shutdown 1.8 2.1 2.3 V
V
HYS
V
BATT
Under-Voltage Hysteresis 120 300 mV
f
SW(REG)
Boost Converter Switching Frequency 1.2 MHz
I
LIMIT(SU)
Boost Converter Inrush
Current Limit
PV
DD
Rising from 0V to V
BATT
600 mA
t
INRUSH
Boost Converter Inrush
Time
PV
DD
Rising from 0V to V
BATT
1000 µs
Auto Boost Startup
Current Ramp Rate
PV
DD
Rising from V
BATT
to 5.6V 15 mA/µs
I
BOOST
Boost Converter Peak
Input Current Limit
Open-Loop Limit 1100 1600 2100 mA
V
BSTOUT
Boost Converter Output Voltage 5.55 5.65 5.75 V
V
BSTSTD
Auto Boost Shutdown Threshold Voltage 2 V
pk
t
HOLD
Auto Boost Shutdown Hold Time 125 ms
V
AGC
AGC Trip Point
AGCT=Floating 3.190 3.250 3.283
V AGCT=GND 3.480 3.550 3.586
AGCT=VBATT 3.680 3.750 3.788
Output Power with AGC
AGCT=GND,
V
IN
=0.4V
pk
, 1KHz Sine
Wave
V
BATT
=3.4V 0.79
W
V
BATT
=3.0V 0.45
t
A
AGC Attack Time 20 µs/dB
t
R
AGC Release Time 1600 ms/dB
AGC Step Size 0.5 dB
AGC Maximum Attenuation 10 dB
V
IH
EN Logic Input High Voltage 1.1 V
V
IL
EN Logic Input Low Voltage 0.45 V
C
IN
EN Capacitance 10 pF
R
PD
EN Pull-Down Resistance 300 K