GENERAL DESCRIPTION
The ft2910 is a highly efficient 7.5W boosted Class-G
audio power amplifier with automatic level control (ALC)
and battery tracking AGC. It integrates a filterless
Class-D audio amplifier with an adaptive multi-level
Class-G boost regulator and operates with a range of
supply voltages from 3V to 5.5V. With a supply voltage
at 3.6V, the ft2910 can deliver an output power of 7.5W
with 10% THD+N, or 6W with 1% THD+N, into a 4Ω
speaker load.
In ft2910, the power supply rail of the audio amplifier’s
output stage is internally boosted and regulated by an
asynchronous PWM switching regulator with an
integrated power switch. The boost regulator employs
current-mode PWM control with proprietary multi-level
Class-G operation to regulate the boosted output
voltage dynamically in response to the voltage level of
the audio outputs. The higher output power and greater
power efficiency resulted from the Class-G boost
regulator make ft2910 an ideal audio solution for
battery-powered electronic devices.
To facilitate various applications, the boost regulator is
independently controlled with three operating modes:
Adaptive Boost, Continual Boost, and Bypass. Also,
there are two boosted supply voltages to be chosen for
different output power requirements.
The ft2910 features ALC function to constantly monitor
and safeguard the audio outputs against the boosted
supply voltage, preventing output clipping distortion,
excessive power dissipation, and speaker over-load.
Once an over-level condition is detected, the ALC
lowers the voltage gain of the audio amplifier
proportionally to limit the peak audio output.
FEATURES
Wide range of supply voltages from 3V to 5.5V
Filterless Class-D audio amplifier integrated with an
adaptive multi-level Class-G boost regulator
Independent control of boost regulator operation
Automatic level control to eliminate output clipping
Battery tracking AGC to prevent battery voltage collapse
Maximum output power in Non-ALC mode
(VBAT=3.6V, RL=4Ω+33µH, THD+N=10%)
PVDD (V) Po (W)
7.6 7.5
7.0 6.3 (VBAT=3.6V, RL=4Ω+33µH, THD+N=1%)
PVDD (V) Po (W)
7.6 6.0
7.0 5.0 ALC output power in ALC mode
(VBAT=3.6V, RL=4Ω+33µH, THD+N=0.3%)
PVDD (V) Po (W)
7.6 5.7
7.0 4.8 Low THD+N: 0.06% (VBAT=3.6V, RL=4Ω+33µH, f=1kHz, Po=4W)
Wide ALC dynamic range: 10dB
Maximum voltage gain: 30dB
Auto-recovering over-current & short-circuit
protection
Available in TSSOP-20L package
APPLICATIONS
Blue Tooth Speakers
Consumer Audio Electronics
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