TS4961T Datasheet, PDF (1/49 Pages) STMicroelectronics – Mono class D audio power amplifier with dedicated analog switch

TS4961T
Mono class D audio power amplifier with dedicated analog switch
Features
QFN 16 3 x 3 mm
■ Wide operating voltage range from
V_CC = 2.4 V to 4.3 V
■ Audio amplifier standby mode active low
) _{■ Output power: 1.6 W at 4.2 V or 0.75 W at}
t(s ^{3.0 V into 4 Ω with 1% THD+N maximum}
c _{■ Output power: 0.95 W at 4.2 V or 0.45 W at}
du ^{3.0 V into 8 Ω with 1% THD+N maximum}
ro ^{■ Adjustable gain via external resistors}
P _{■ Low current consumption 2 mA at 3 V}
te ■ Efficiency: 88% typical
le _{■ Signal-to-noise ratio: 85 dB typical}
so ■ PSRR: 63 dB typical at 217 Hz with 6 dB gain
b _{■ PWM base frequency: 250 kHz}
- ^{O ■ Low pop and click noise}
) _{■ Dual Power SPST with separated control}
t(s _{■ Ultra-high off-isolation on analog switch:}
c _{-80 dB typical from 20 Hz to 20 kHz}
rodu ^Applications
P _{■ Cellular telephones}
te _{■ PDAs}
ole ^{■ Notebook PCs}
Obs ^Description
TS4961TIQT pinout
The audio amplifying gain of the device can be
controlled via two external gain-setting resistors. It
is designed to operate from 2.4 to 4.3 V, making
this device ideal for portable applications.
The TS4961T is a smart combination of one
mono class D audio power amplifier and a
high-speed CMOS low-voltage dual power analog
SPST.
One of the key functions of this device is the
switch mode of the various audio signals coming
from the codec or baseband through the
loudspeaker. It can drive up to 1.6 W into a 4 Ω
load and 0.95 W into an 8 Ω load. It achieves an
outstanding efficiency of up to 88% typical.
September 2008
Rev 1
1/49
www.st.com
49