Datasheet

© 2011 Fairchild Semiconductor www.fairchildsemi.com
FAB3103 • Rev. 1.0.2 4
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
I
DD
Quiescent Current Inputs AC Grounded, EN=HIGH 2.7 mA
I
SD
Shutdown Current EN=PGND, Inputs AC Grounded 0.1 2.0 µA
t
WU
Wake-Up Time
From LOW to HIGH EN Transition to Full
Operation
5 12 ms
f
SW(AMP)
Class-D Switching
Frequency
300 KHz
V
OS
Differential Output Offset
Voltage
Inputs AC Grounded 1.67 5.00 mV
A
V
Gain AGC Inactive 9.5 10.0 10.5 V/V
R
IN
Input Resistance
Gain=10V/V
(AGC Inactive)
Differential 24 30 36
K
Single-Ended 12 15 18
R
STD
Single-Ended Input
Impedance During
Shutdown
EN=PGND, AC-Coupled Inputs, V
INx
< 2V
rms
per Input
80 K
V
STD
Maximum Single-Ended
Input Voltage Swing
During Shutdown
EN=PGND, AC-Coupled Inputs 2 V
rms
THD+N Added to Audio
Signal at Inputs During
Shutdown
EN=PGND, AC-Coupled Inputs,
Source Impedance < 1
Ω
0.02 %
THD+N
Total Harmonic Distortion
Plus Noise
P
OUT
=100mW 0.01
%
P
OUT
=500mW 0.02
P
O
Output Power
THD+N
≤
10%
2.3
W
THD+N
≤
1%
1.85
I
DLMT
Class-D Output Current
Limit
1.4 A
PSRR
Power Supply Rejection
Ratio
Inputs Shorted, AC
Grounded, Output
Referred;
V
RIPPLE
=200mV
P-P
Square Centered
Around V
BATT
=3.8V,
50% Duty Cycle, 10µs
Rise/Fall Time
f
RIPPLE
=1KHz, Boost
Enabled
85
dB
f
RIPPLE
=217Hz, Boost
Enabled
88
f
RIPPLE
=1KHz, Boost
Bypassed
77
f
RIPPLE
=217Hz, Boost
Bypassed
70
CMRR
Common-Mode Rejection
Ratio
Output Referred,
V
RIPPLE
=200m V
P-P
Square, 50% Duty
Cycle, 10µs Rise/Fall
Time, Inputs Shorted
and AC-Coupled to
V
RIPPLE
f
RIPPLE
=1KHz 75
dB
f
RIPPLE
=217Hz 71
V
BIAS
IN+, IN- Bias Voltage 1.2 V

Efficiency
R
L
=8
Ω
+ 33µH , P
OUT
=1.0W
85 %
SNR Signal-To-Noise Ratio
P
OUT
=1.85W, A-Weighted 100
dB
P
OUT
=1.85W, Unweighted 97
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