FDMA905P Datasheet, PDF (3/8 Pages) Fairchild Semiconductor – New Products, Tips and Tools for Power and Mobile Applications

CLASS-D AUDIO AMPLIFIER
Advantages
• Low EMI design allows
filterless operation
• High noise rejection using
differential audio inputs
• High efficiency boost regulator
provides higher output power
over battery voltages
• Boost shutdown at lower
output power increases
efficiency and reduces
quiescent current
consumption
• AGC monitors battery voltage
and dynamically adjusts gain,
extending battery runtime
Achieve Loud and Clear Sound
While Extending Battery Life
Customer demand is driving the need for louder and clearer speaker
sound in mobile devices. While minimizing impact on battery life,
designers can achieve the performance they require with Fairchild’s
FAB3103. The 2.3W Class-D audio amplifier with integrated boost
regulator and battery automatic gain control (AGC) allows for
high audio output power over a power supply range of 2.5V to 5.2V from a 3.6V
Li-Ion battery.
At low power output, the device’s boost regulator automatically shuts down
for greater efficiency and lower quiescent current consumption, resulting in
longer battery runtime. The FAB3103 audio amplifier also features battery
AGC that reduces gain when the power supply voltage is low in order to limit
maximum power consumption, reducing distortion and preventing early device
software shutdown.
Available in a 12-bump, WLCSP, the FAB3103 device also offers several
protection features including short circuit protection, low voltage shutdown, and
click-and-pop suppression.
Applications
• Mobile handsets
• Smart phones
• Tablets
• Multimedia Internet
devices (MID)
• Portable media players
For more information, please visit:
www.fairchildsemi.com/pf/FA/FAB3103.html
BATTERY
C VBATT
10μF
VBATT
L SW
2.2μH
SW
EN
C INP
1μF
IN+
IN-
C INN
1μF
Boost Regulator
Class-D Amplifier
PVDD
C VREG
22μF
OUT+
OUT-
AGCT
BATTERY
10
f = 1KHz
VBATT=4.8V
VBATT=4.2V
VBATT=3.6V
1
VBATT=2.8V
0.1
0.01
0.001
0.01
0.1
1
10
Output Power (W)
Typical Application Circuit
Total Harmonic Distortion + Noise
vs. Output Power
Product
Number
FAB3103
Supply
Voltage
(V)
2.5 to
5.2
Output
Power
at 10%
THD+N
3.6V,
8Ω (W)
2.3
Output
Power
at 1%
THD+N
3.6V,
8Ω (W)
1.85
THD+N
at 0.1W
3.6V,
8Ω (%)
0.01
Features
Speaker
Amplifier
Filterless
Class-D
Integrated
Boost
Converter
Class-G
Package
(mm x mm)
12-WLCSP,
1.86 x 1.44